Sinking IsleOnline
Co-op survival on a sinking island — two explorers gather four treasures and escape together before it sinks. Private hands, shared fate. Play with a friend over an invite link, or solo.
Defuse LineOnline
One player sees the device, the other holds the manual — talk it out and defuse every module before your moves run out. An asymmetric-information co-op puzzle. Invite a friend, or play both roles solo.
The CrewOnline
A co-op trick-taking card game with limited communication — complete the mission together by reading each other's plays. Invite a friend, or play with an AI partner.
HanabiOnline
You can't see your own hand — only your partner's hints. Spend limited hint tokens to build the five fireworks in order. A co-op card game. Invite a friend, or play with an AI partner.
Cipher DuetOnline
Give one-word clues to guess your teammate's secret words while avoiding the assassin. Each player sees a different key. A co-op word game. Invite a friend, or play solo.
Shogi AcrossOnline
Play full-rules Shogi over invite-only peer-to-peer — no server, no sign-up. Match a friend or spectate a game remotely. Just send a link.
Chess AcrossOnline
Play full-rules chess over invite-only peer-to-peer — no server, no sign-up. Match a friend or spectate a game remotely. Just send a link.
Reversi AcrossOnline
Play Reversi (Othello) over invite-only peer-to-peer — no server, no sign-up. Match a friend or spectate a game remotely. Just send a link.
Go AcrossOnline
Play Go over invite-only peer-to-peer — 9/13/19 board, full life-and-death and territory scoring with a pass-and-agree endgame. Match a friend or spectate remotely. Just send a link.
Mahjong AcrossOnline
Play four-player Riichi mahjong over invite-only peer-to-peer — your hand stays private to your seat. Empty seats are filled by AI, and AI covers anyone who disconnects. Invite up to three friends. Spectate too.
Gomoku AcrossOnline
Play Gomoku (five-in-a-row) over invite-only peer-to-peer — no server, no sign-up. Match a friend or spectate a game remotely. Just send a link.
Hex AcrossOnline
Play Hex over invite-only peer-to-peer — connect your two sides to win, no draws ever. Match a friend or spectate a game remotely. Just send a link.
Infection AcrossOnline
Play Infection (Ataxx-style territory) over invite-only peer-to-peer — clone, jump and infect to claim the 8×8 board. Match a friend or spectate remotely. Just send a link.
PlumblineOnline
Build one 3D voxel solid that two players each see only as a shadow — one from above, one from the side. Neither shadow alone fixes where a block goes; combine both, or it collapses. A turn-based co-op build puzzle. Invite a friend, or play solo.
ParallaxOnline
Two players view the same impossible solid from different angles — a bridge that stands only in your view, which you rotate to lock in. Half the path is always invisible to one of you. A turn-based co-op puzzle. Invite a friend, or play solo.
CorridorOnline
One player walks a maze in first-person and reads the markings on the walls; the other holds the top-down map and the route. Each sees only half — talk it out and reach the exit together. A turn-based co-op maze. Invite a friend, or play solo.
Flux GateRealtime
Real-time co-op: dam a shared canal. Polluted water pours in from upstream — two players work valves, splits and pumps in real time to steer it into two drains before it overflows. Solo with an AI partner.
BeaconRealtime
Real-time asymmetric co-op: a ship lost in fog must reach port. The keeper sees the whole chart but can't steer; the ship sees only a few cells and is pushed by the tide every tick. Flash three colours to guide the unstoppable ship home. Solo with an AI partner.
LatticeRealtime
Real-time co-op: a pulsing 5×5 grid where each cell opens a brief press-now window. One player sees the timing, the other the target pattern — call it out and tap together inside the window to resonate the lock open. Solo with an AI partner.
SpliceRealtime
Real-time co-op logistics: boxes ride a self-running grid every tick. One player lays the in-feed belts, the other the out-feed — mesh your directions at the seam to hand boxes across and route each to its exit before they jam. Solo with an AI partner.
WatchtowerRealtime
Real-time asymmetric tower defense: threats close in every tick. The lookout sees their type and arrival far off but can't fire; the gunner can fire but can't tell what's coming. Signal and intercept together. Solo with an AI partner.
ConduitRealtime
Real-time asymmetric co-op maze: the navigator sees the whole map but cannot move; the walker sees only a first-person corridor and follows colour cues to the exit — with a pursuer closing in. Solo with an AI partner.
SpindleRealtime
Real-time co-op on a rotating cylinder: one player opens valves on the near face while the other rotates the drum to bring far-side slots to the front — sync your timing to flush each pulse into its slot before it overflows. Solo with an AI partner.
KeystoneRealtime
Real-time co-op construction: two builders stack a tower and bridge — one works the lower half, one the upper. Every block shifts the balance, and what your partner stacks changes your own stability limit. Keep the moment in check or it collapses. Solo with an AI partner.
TUMBLE
Tumble a floating wireframe solid with one finger until it lines up with the target shadow. A 3D spatial puzzle where the same solid looks completely different from every angle. Daily lock, endless mode, and share.
ISOHEDRON
Walk a figure across an impossible structure where what connects depends on how it's drawn — two faces meet only because they line up on screen. A zero-dependency 3D impossible-geometry puzzle, Echochrome-style. Daily and endless.
GRAVITY
Place planets to create gravity fields and guide the spaceship to the goal. A space physics puzzle game — you control gravity itself, not the ship. 10 stages.
CHAIN
Tap one light to ignite a chain reaction — the blast spreads and detonates every dot it touches. Catch enough in a single chain to clear. A one-finger neon chain-reaction puzzle with endless levels and a daily challenge.
HUE
Crack the daily 4-colour code in 6 guesses
HASHI
Bridge the numbered islands so everything connects — a classic logic puzzle where every board has exactly one solution, machine-verified. Daily puzzle plus free mode with three sizes and difficulties.
Strategy Order
Deterministic tactics where every enemy move is telegraphed - reroute attacks with pushes, height and cover on a 3D voxel battlefield. 10-stage campaign plus a daily puzzle. No luck involved.
ColorDrop
Drop colorful blocks and match 3+ of the same color to clear them. Chain combos, use bombs and recolor tickets, and play Endless, Time Attack, Challenge, or a shared Daily board!
Milk Puzzle
An all-white jigsaw puzzle with no image. Read the piece shapes and find where they fit!
PHASE
Change the state of matter to solve puzzles. Switch between ice, water, and steam — each with unique properties — to guide the energy core to the goal. 11 stages.
BEAM
Place 45° mirrors to bend a beam of light and hit every target. A one-finger reflection puzzle — you don't aim the light, you build its path. 12 stages introduce splitters, portals, colour and prisms, then unlock endless mode and a daily puzzle.
FIELD
A magnetic field puzzle. Place N and S pole magnets to design invisible force fields and guide a particle to the goal. You don't move the particle — you move the field. 8 stages.
WIND
Place fans to design air currents and float a paper plane to the goal. A wind force-field puzzle — you don't steer the plane, you shape the wind. 5 stages plus an endless procedurally generated mode.
FLOW
Design the path. Water obeys. Place walls to redirect the flow and guide water into the golden goal. A minimalist fluid-puzzle game across 8 stages.
MACHINE
Mesh gears to transmit a motor's rotation to the output. An indirect-design puzzle of direction, gear ratio, belts and shafts — get the rotation where it needs to go. 8 stages plus a daily generated puzzle.
CIRCUIT
Wire inputs, drop logic gates and make the output signal correct. Learn AND, OR, NOT, XOR and truth tables by playing. 8 campaign stages plus an endless ladder and a daily puzzle.
Blue Bird
A blue bird flapping game. Tap, click, or press Space to fly through the pipes — brutally fast from pipe 1, one miss ends it. Free daily challenge too!
SHADOW
Move the light source to cast shadows. Only shadows are solid ground. Design terrain with light itself — a minimalist shadow platformer across 10 stages, plus a daily 3-run challenge.
SWARM
Drag one finger to steer a living cloud of light that auto-melts the beasts it covers. Soak up XP, level up to pick upgrades, build your swarm, and bring down the boss. A one-finger survivor-roguelite.
ECHO
Your ally is your past self. Every 5 seconds your actions are recorded and a ghost replays them. Cooperate with echoes of yourself to solve time-based puzzles across 7 stages.
HOOK
Hold to grapple. Release to fly. A one-button endless swing runner — keep your momentum and outrun the collapsing void sweeping in from the left. Go as far as you can, with a daily challenge and shareable runs.
RingTap
Tap the instant the orbiting marker crosses the glowing gate. Chase Perfect timing, gold-gate Fever, missions, and combo streaks across Arcade, Zen, Hard, and a daily challenge.
Solitaire
Classic Klondike Solitaire. Draw 1 or 3, drag & drop, undo, auto-complete, score & timer.
Riichi Mahjong
Japanese Riichi Mahjong against 3 AI opponents. Riichi, pon, chi, kan, dora and full yaku scoring.
Reversi
Classic Reversi on an 8×8 board. Play vs a friend or challenge the CPU. Hint display included.
Chess
Full-rules chess with castling, en passant, and pawn promotion. Play vs a friend or challenge the CPU.
Shogi
Full-rules Japanese chess with drops, promotion, and CPU opponent. Piece capture and hand pieces fully supported.
Go
Classic Go (Weiqi/Baduk) on 9×9, 13×13, or 19×19 board. Place stones to surround territory. Play vs a friend or challenge the CPU. Japanese rules with 6.5 komi.
Gomoku
Classic Gomoku (Five in a Row) on a 15×15 board. Place 5 stones in a row to win. Play vs a friend or challenge the CPU.
Hex
Abstract strategy game on a hexagonal board. Connect your two sides before your opponent. No draws exist — pure strategy.
Infection
Clone, jump, or infect. Expand your colony across an 8×8 board and convert enemy cells. Simple rules, deep strategy.
NonogramNew
Fill in cells using number clues to reveal a picture — a daily nonogram (picture logic) puzzle with one new puzzle a day.
Make 10New
Combine four numbers with +, −, ×, ÷ to make 10 — a daily "Make 10" arithmetic puzzle with 3 new puzzles each day.
Kanji CraftNew
Tap and combine kanji components to build characters (e.g. 日+月=明) — a daily kanji-building puzzle.
Ken-TsunagiNew
Connect neighboring Japanese prefectures one by one to link two prefectures using the fewest steps — a daily route puzzle.
Unit ChainNew
Chain unit-conversion cards so units cancel out, dimensional-analysis style — a daily unit-conversion puzzle.
Rekishi TimelineNew
Arrange Japanese history events (with hidden years) on a timeline by reasoning about their order — a daily history sequencing puzzle.
Root CraftNew
Combine root and affix tiles to build English words (e.g. retro+spect=retrospect) — a daily etymology puzzle for GRE/SAT vocabulary.
LoopNew
Connect fences guided by number clues to form a single loop — a daily loop-drawing logic puzzle (Slitherlink-style).
Cross SumNew
Black-cell numbers are the sum of the following white cells — fill in 1-9 without repeats in this addition crossword. Daily puzzle, 3 a day.
Calc CageNew
Use the target number and operator shown in each bold-outlined cage to fill every row and column with 1-N — a daily arithmetic logic puzzle (KenKen-style).
Iro-TsunagiNew
Connect matching-colored pairs with lines so every cell is filled — a daily line-connecting logic puzzle (Numberlink-style).
QR Code GeneratorNew
Generate QR codes from any text or URL instantly. Customize size, colors, margin, and error correction. Download as PNG or SVG.
Timezone Converter
Convert time between the world's major timezones. Live world clocks, presets, and shareable links.
JSON FormatterNew
Format, minify, and validate JSON instantly. Syntax highlighting, error detection, stats, and one-click copy.
Diff CheckerNew
Compare two texts and highlight differences line by line. Unified and side-by-side views with inline char diff.
Base64 Encoder / DecoderNew
Encode text or files to Base64, or decode Base64 strings. URL-safe mode, drag & drop file upload, Unicode support.
URL Encoder / DecoderNew
Encode or decode URLs and query strings instantly. Supports encodeURIComponent, encodeURI, and full URL breakdown with query parameter parsing.
Password GeneratorNew
Generate strong, secure passwords instantly. Customize length, character sets, exclude ambiguous chars, and generate up to 20 passwords at once.
Unit ConverterNew
Convert length, weight, temperature, area, volume, speed, time, and data units instantly. 8 categories, 80+ units.
Regex TesterNew
Test regular expressions with live match highlighting, capture group inspection, and flag toggles. No lag, no server.
Markdown PreviewNew
Write Markdown and see the rendered output live. Supports GFM tables, task lists, code blocks, and copy-as-HTML.
Cron GeneratorNew
Build cron expressions visually. Get human-readable descriptions, presets, and preview the next 5 scheduled run times.
Color Palette GeneratorNew
Generate beautiful color palettes from any base color. Complementary, analogous, triadic, and more. Copy HEX, RGB, HSL. Export as CSS or JSON.
Image → Base64New
Convert images to Base64 instantly. Drag & drop or paste from clipboard. Copy as Data URL, raw Base64, CSS background-image, or HTML img tag.
JWT DecoderNew
Decode JWT tokens instantly. Inspect header, payload, and claims. Check expiry, algorithm, issuer, and more — fully client-side, nothing sent to server.
Word & Character CounterNew
Count words, characters, sentences, paragraphs and reading time instantly. Real-time text statistics with keyword density.
Case ConverterNew
Convert text between camelCase, snake_case, PascalCase, kebab-case, CONSTANT_CASE, Title Case, UPPERCASE, lowercase and more.
UUID GeneratorNew
Generate UUIDs instantly — v4 (random), v1 (time-based), v7 (sortable), and NIL. Bulk generate, customize format, and copy or download.
Hash GeneratorNew
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text instantly. All hashing runs locally in your browser.
Code Formatter & MinifierNew
Beautify or minify JavaScript, CSS, HTML, and SQL instantly. Adjustable indentation, auto language detection, copy & download.
CSV ⇄ JSON ConverterNew
Convert between CSV and JSON instantly in your browser. Bidirectional, with delimiter options, header detection, and one-click copy or download.
JSON ⇄ YAML ConverterNew
Convert between JSON and YAML instantly in your browser. Bidirectional, with validation, formatting, and one-click copy or download.
CSS GeneratorNew
Visually build CSS gradients and box-shadows with live preview. Adjust colors, angles, offsets, blur, and spread, then copy the CSS instantly.
Image Compressor & ResizerNew
Compress and resize images instantly in your browser. Adjust quality, dimensions, and format (JPEG, PNG, WebP). Reduce file size without uploading.
Lorem Ipsum GeneratorNew
Generate Lorem Ipsum placeholder text instantly. Choose paragraphs, sentences, or words, wrap in HTML tags, then copy or download.
Unix Timestamp ConverterNew
Convert Unix timestamps to human-readable dates and back, instantly. Supports seconds & milliseconds, local time & UTC. Live current timestamp.
Calculator (BMI · Age · Days)New
Three free calculators in one: BMI with weight category, exact age in years/months/days, and the number of days between two dates.
Percentage & Discount CalculatorNew
Find X% of a number, what percent one number is of another, percentage increase/decrease, and sale prices with tax. Instant, no login.
Loan & Mortgage CalculatorNew
Calculate monthly loan and mortgage payments instantly. Supports equal-payment and equal-principal methods, with a full amortization schedule.
PDF MergeNew
Combine multiple PDF files into one, right in your browser. Reorder pages by drag, no upload, no login — 100% private and free.
Image Converter (PNG ⇄ JPG ⇄ WebP)New
Convert images between PNG, JPG, and WebP instantly in your browser. Batch convert, set quality, and download — no upload, completely private.
Bill Split & Tip CalculatorNew
Enter the total, tip %, tax, and number of people to get the amount each person pays instantly — with optional rounding. Free, no login.
Compound Interest & Savings CalculatorNew
See the future value of your savings with compound interest. Enter principal, monthly contribution, rate, and term for total interest plus a year-by-year chart.
PDF SplitNew
Split a PDF by page ranges or extract individual pages, right in your browser. No upload, no login — 100% private and free.
Image to PDFNew
Convert JPG, PNG and WebP images into a single PDF. Reorder by drag, choose paper size, margin and orientation. No upload, 100% private.
Sales Tax CalculatorNew
Add tax to a net price, remove tax from a gross price, or find the tax amount only. Custom rate plus 8% / 10% presets, instant rounding.
Calorie & BMR CalculatorNew
Estimate your BMR and TDEE from height, weight, age, gender and activity level using the Mifflin-St Jeor formula. Targets for losing, maintaining, gaining.
Pomodoro Timer / StopwatchNew
Pomodoro timer, countdown timer, and stopwatch in one. 25/5 work-break presets, custom durations, sound alarm, browser notifications, accurate tab-title countdown.
Salary Calculator (Hourly ↔ Annual)New
Convert pay between hourly, daily, weekly, monthly, and annual instantly. Set work hours and days, add a deduction rate, and estimate take-home pay. Any currency.
Image Crop & RotateNew
Crop, rotate, and flip images in your browser. Drag to select, lock aspect ratio (1:1 / 16:9 / 4:3), rotate 90°, mirror, and export as PNG, JPG, or WebP. No upload.
Compress PDFNew
Shrink PDF file size in your browser. Re-encodes and downscales in-page images, with High / Medium / Low levels and before/after comparison. No upload, 100% private.
PDF to ImageNew
Convert each PDF page to a PNG or JPG image in your browser. Choose resolution, download pages individually or all at once. No upload, 100% private.
Due Date CalculatorNew
Estimate your pregnancy due date from your last period, conception, or transfer date. See current week and trimester. A general guide, not medical advice.
Countdown TimerNew
Count down to any date and time with live days, hours, minutes, and seconds. Track multiple events and share via URL. Runs entirely in your browser.
Favicon GeneratorNew
Turn any image into favicons — 16/32/48, Apple touch, and 192/512 PNGs plus ICO. Download all at once with a ready-to-paste HTML snippet. No upload.
Image to Text (OCR)New
Extract text from images with in-browser OCR. Drag & drop a PNG, JPG, or WebP and get editable text — English and Japanese supported. No upload, 100% private.
Online NotepadNew
A free notepad that auto-saves in your browser. Word and character count, .txt download, dark mode. Your notes stay on your device — nothing is uploaded.
Random Picker (Wheel · Dice · Coin)New
Pick a winner from a list with a spinning wheel, generate random numbers, roll dice, or flip a coin. Fun animations, all in your browser.
chmod CalculatorNew
Convert Unix file permissions both ways — toggle owner/group/other r/w/x to get octal (755) and symbolic (rwxr-xr-x), including setuid/setgid/sticky. Runs entirely in your browser.
JSON to TypeScriptNew
Paste JSON and instantly generate TypeScript interfaces or types — nested objects, arrays, unions and nullables inferred. Nothing is uploaded; conversion runs in your browser.
.gitignore GeneratorNew
Generate a .gitignore from templates — pick languages, frameworks, OS and editors, then copy or download the combined, duplicate-free file. Searchable.
LED Resistor CalculatorNew
Calculate the series resistor for an LED from supply voltage, forward voltage and current — with nearest E24 value and power dissipation. Runs in your browser.
cURL to Code ConverterNew
Convert a cURL command into JavaScript fetch, axios, Python requests or Node.js code. Parses method, headers, data and auth — entirely in your browser.
Mock Data GeneratorNew
Generate realistic mock / dummy data as JSON, CSV or SQL — define fields, pick a locale (EN/JA), set row count and an optional seed. Runs in your browser.
SQL FormatterNew
Format and beautify SQL — line breaks on major clauses, indentation, keyword case, indent width and comma position. Best-effort, entirely in your browser.
Number Base & BitwiseNew
Convert between binary, octal, decimal and hex live, plus AND/OR/XOR/NOT/shift bitwise ops with 8–64-bit width and two's complement. BigInt-accurate, in your browser.
Voltage Divider CalculatorNew
Compute the output of a resistor voltage divider (Vout = Vin·R2/(R1+R2)), reverse-solve resistor values, and see current, power and loaded output. In your browser.
Resistor Series & ParallelNew
Calculate the total resistance of resistors in series (sum) or parallel (reciprocal), with any number of resistors and a nearest-E-series combination finder. In your browser.
RC / LC Filter CalculatorNew
Find RC low/high-pass cutoff (fc = 1/2πRC) and LC resonant frequency (f0 = 1/2π√LC), with time constants and reactance. Solve forward or reverse, in your browser.
555 Timer CalculatorNew
Calculate NE555 astable frequency, duty cycle and on/off times, or monostable pulse width, from R and C values. Switch modes, any units, in your browser.
Metal Weight CalculatorNew
Weight of round bar, flat bar, hex, tube, pipe and plate from material and dimensions — per piece, total, volume and cross-section. Steel, aluminum, brass, titanium and custom density.
Hardness Conversion CalculatorNew
Convert steel hardness between Vickers (HV), Rockwell C/B/A, Brinell (HB), Knoop (HK) and tensile strength (MPa/ksi). Continuous interpolation per ASTM E140 / ISO 18265.
Bolt Torque & Preload CalculatorNew
Tightening torque from target preload, or preload and bolt stress from torque, using T=K·F·d. Metric M3–M36, classes 8.8/10.9/12.9, nut factor K.
Beam Deflection CalculatorNew
Maximum deflection, bending stress, bending moment and section I for cantilever and simply supported beams under point or uniform loads. Rectangle, round and pipe sections.
CNC Feeds & Speeds CalculatorNew
Spindle RPM = Vc×1000/(π×D), feed rate vf = n·fz·z, feed per rev and material removal rate for milling and drilling. Reverse-solve cutting speed from RPM.
Gear Ratio CalculatorNew
Total reduction ratio i = Π(z_out/z_in), output speed N_in/i and output torque T_in·i·η for single- or multi-stage gear trains. Efficiency and pitch-circle diameters.
Press-Fit (Interference) CalculatorNew
Contact pressure, hub and shaft hoop stress, insertion force F=π·d·L·p·μ and transmissible torque from a diametral interference, using Lamé thick-cylinder theory. Hollow shaft and dissimilar materials.
Voltage Drop CalculatorNew
Compute wire voltage drop Vd = k·I·ρL/A, the drop %, end-of-run voltage and one-way resistance. Copper or aluminium, AWG or mm², DC / single- / three-phase, with temperature correction.
PCB Trace Width CalculatorNew
IPC-2221 trace width from current, temperature rise and copper weight: A=(I/(k·ΔT^0.44))^(1/0.725), width = A / (oz·1.378). External or internal layers.
Tolerance Stack-Up CalculatorNew
Add up dimension tolerances to get the worst-case and statistical (RSS) gap. Variable rows with nominal, +/− tolerance and direction; reports nominal, min–max and ±RSS.
Compression Spring CalculatorNew
Spring rate k = G·d⁴/(8·D³·Na), load/deflection, Wahl-corrected shear stress and spring index from wire and coil dimensions. Steel, stainless, bronze and brass.
Op-Amp Gain CalculatorNew
Closed-loop voltage gain, gain in dB and output of an ideal op-amp. Non-inverting (1 + Rf/Rg), inverting (−Rf/Rin) and buffer stages. In your browser.
Thermal Expansion CalculatorNew
Length change ΔL = α·L0·ΔT, final dimension and strain from a material coefficient of linear expansion. For shrink-fit and clearance sizing. In your browser.
Sheet Metal Bend CalculatorNew
Bend allowance, bend deduction and flat blank length with the K-factor method: BA=(π/180)·θ·(R+K·T). For sheet metal fabrication. In your browser.
E-Series Preferred Value CalculatorNew
Snap any target to the nearest IEC 60063 E-series value (E6–E192) with percent error, neighbours and tolerance. For resistor and capacitor selection. In your browser.
Ohm's Law CalculatorNew
Enter any two of voltage, current, resistance and power and get the other two — V=IR, P=VI and all the wheel formulas, with unit prefixes. In your browser.
Battery Life CalculatorNew
Estimate runtime from capacity and load — by current or power: t = capacity / load × efficiency, with energy in Wh and effective capacity. In your browser.
Section Modulus CalculatorNew
Section modulus Z, moment of inertia I, area, radius of gyration and bending stress σ=M/Z for rectangle, round, tube and box sections. In your browser.
Cubic Bezier GeneratorNew
Visual CSS cubic-bezier easing editor: drag the control points, preview the animation live, and copy the cubic-bezier() value. Presets included. In your browser.
Clip-Path GeneratorNew
Visual CSS clip-path editor: drag polygon vertices to craft triangles, stars, arrows and speech bubbles, switch to circle/ellipse/inset, preview live and copy the code. In your browser.
Border Radius GeneratorNew
Round all four corners independently, switch px/%/em, and use fancy mode for elliptical blob/squircle corners. Live preview, one-click copy and shareable links. In your browser.
Flexbox GeneratorNew
Set flex-direction, justify-content, align-items, align-content, flex-wrap and gap with one click, watch a real live layout react, and copy the container CSS. In your browser.
CSS Grid GeneratorNew
Set column and row counts, size each track with fr, px, auto or minmax(), tweak column-gap and row-gap, watch a live grid preview and copy the container CSS. In your browser.
Text Shadow GeneratorNew
Tune offset, blur, color and opacity, stack multiple shadow layers for neon, 3D, outline and glow effects, preview on your own text and copy the text-shadow rule. In your browser.
CSS Filter GeneratorNew
Drag sliders for blur, brightness, contrast, grayscale, hue-rotate, invert, saturate and sepia, watch a live image preview and copy the filter property. Presets included. In your browser.
CSS Transform GeneratorNew
Drag sliders for translate, scale, rotate, skew and perspective, watch a live 3D preview and copy the transform property instantly. In your browser.
Glassmorphism GeneratorNew
Design frosted-glass UI with backdrop-filter: tune blur, transparency, saturation, radius, border and shadow over a colorful backdrop, then copy the CSS with the -webkit- prefix. In your browser.
CSS Button GeneratorNew
Tweak padding, font, border-radius, solid or gradient background, border, shadow and hover effect, watch a real live button, then copy the .btn / .btn:hover CSS. In your browser.
Neumorphism GeneratorNew
Design soft-UI cards: set base color, size, radius, shadow distance, blur, intensity and shape — the light and dark shadows are computed automatically. Copy the CSS. In your browser.
CSS Loader GeneratorNew
Pick a ring, dual-ring, dots, bars or pulse spinner, tune size, color, speed and thickness, watch it animate live, then copy pure-CSS with @keyframes. In your browser.
CSS Animation GeneratorNew
Pick a preset effect (fade, slide, bounce, pulse, shake, spin, flip, zoom), tune duration, delay, timing, iteration and direction, replay the preview and copy the @keyframes + animation CSS. In your browser.
CSS Transition GeneratorNew
Add target properties, set duration, timing-function (ease, linear, cubic-bezier) and delay, then hover or click the live demo to watch it run and copy the shorthand transition CSS. In your browser.
CSS Pattern GeneratorNew
Build stripes, diagonal stripes, checkerboard, polka dots, grid and zigzag patterns with pure CSS gradients — no images. Tweak colors, size, thickness and angle, preview live and copy the background CSS. In your browser.
SVG Blob GeneratorNew
Create smooth, organic random blob shapes for hero backgrounds and decorations. Tweak vertices, randomness, size, color and gradient, then copy a complete SVG snippet or a CSS clip-path. Seeded and shareable by URL. In your browser.
CSS Scrollbar GeneratorNew
Set the width, track color, thumb color, hover color and corner radius, scroll a live preview with your real styling, then copy both the webkit scrollbar rules and the standard scrollbar-width / color properties. In your browser.
Design Tokens GeneratorNew
Pick a base hue and style preset to generate a full CSS custom-property theme — colors, shadows, radius, spacing, type scale and easing — HSL-based, ready to paste into games or UIs. In your browser.
Distinct Colors GeneratorNew
Generate N maximally distinguishable colors with OKLCH — equal perceived brightness and colorblind-aware. Great for game blocks and categories, with color-vision simulation. Copy hex, OKLCH or CSS vars. In your browser.
Contrast CheckerNew
Check the contrast ratio between two colors and verify WCAG AA/AAA pass-fail, with colorblind simulation and improvement hints. Great for game and UI readability. In your browser.
Game Shape Set GeneratorNew
Generate a set of N mutually distinguishable silhouettes for puzzle and game pieces as inline SVG or CSS clip-path, with a built-in silhouette test for colorblind-safe color+shape encoding. In your browser.
Game Material / Gem GeneratorNew
Make flat squares and circles look like gems, orbs, glossy tiles or tactile buttons with gradient, highlight and shadow — no images. Copy the CSS or the Canvas-gradient equivalent. In your browser.
Easing & Motion GeneratorNew
Pick a named easing (ease-out, back, elastic, bounce…), feel it on a live moving box, and copy the cubic-bezier plus a ready-to-paste motion-token set (--ease, --dur). In your browser.
Impedance CalculatorNew
Series RLC reactances Xc=1/(2πfC), Xl=2πfL, impedance |Z|=√(R²+(Xl−Xc)²), phase angle and resonant frequency f0. In your browser.
RMS to Peak CalculatorNew
Convert RMS, peak, peak-to-peak and average voltage for sine, square and triangle waveforms, with crest factor, dBV and dBu. In your browser.
Pulley & Belt CalculatorNew
Speed ratio, driven rpm, belt speed and open-belt length from two pulley diameters, the drive speed and the centre distance. In your browser.
Hydraulic Cylinder CalculatorNew
Push (extend) and pull (retract) force F=P·A, bore and annulus areas, and rod speed from bore, rod diameter, pressure and flow. In your browser.
Decibel (dB) CalculatorNew
Convert voltage/power ratios to dB and back (20·log₁₀ / 10·log₁₀), and dBm ↔ watts. In your browser.
ADC Resolution CalculatorNew
Quantization step LSB=Vref/2^N, levels, ideal SNR=6.02N+1.76 dB, dynamic range and ENOB from a measured SNR. In your browser.
Power, Torque & RPM CalculatorNew
Any two of power, torque and speed give the third via P=2πNT/60, plus mechanical HP and metric PS. In your browser.
Gear Module CalculatorNew
Spur-gear dimensions from module m and teeth z: pitch/tip/root diameter, circular pitch, base circle and centre distance. In your browser.
Bolted Joint Design (VDI 2230)New
Bolted-joint design to VDI 2230: preload F_Mmax / torque M_A, load factor Φ, embedding loss, fatigue and surface pressure. SI / imperial.
Power Loss & Heatsink (MOSFET / IGBT)New
MOSFET / IGBT loss to required heatsink θSA, junction temperature and margin, end to end. SI; verified vs TI / Renesas.
Gear Strength (AGMA)New
Spur-gear root bending and flank contact stress with AGMA 2001-D04 safety factors, showing which mode governs. SI / imperial.
Fatigue Design (Marin / Goodman)New
Endurance limit via the full Marin chain, Goodman / Gerber / ASME safety factors and an interactive Goodman diagram. SI / imperial.
Heatsink Fin θSANew
Fin-array thermal resistance θSA from geometry and convection — fin efficiency η_f and overall η_o; paste a required θSA for pass/fail. SI.
Shaft Design (ASME / DE-Goodman)New
Shaft diameter or fatigue safety factor under combined bending + torsion: DE-Goodman / Gerber / ASME-Elliptic / Soderberg plus first-cycle yield. SI / imperial.
Rolling Bearing Life (ISO 281)New
ISO 281 rating life L10 and hours from C / P, with the X/Y/e equivalent-load table, reliability factor a1 and modified life. SI / imperial.
Key & Keyway (DIN 6885 / ASME B17.1)New
Parallel / square key sizing by shear and bearing (h/2), with b×h auto-selected from the shaft band (DIN 6885 / ASME B17.1). SI / imperial.
HTTP Status CodesNew
All 62 HTTP response status codes. Search by code or name, filter by category, copy instantly.
Git Cheat SheetNew
Essential Git commands — setup, branch, merge, remote, stash, undo and more. Search and copy instantly.
Regex Cheat SheetNew
Regular expression syntax — anchors, quantifiers, character classes, groups, lookaheads, flags and common patterns.
SQL Cheat SheetNew
Essential SQL syntax — SELECT, JOINs, aggregates, subqueries, CTEs, DDL, DML, indexes, and transactions.
Unix Command Cheat SheetNew
Essential Unix/Linux shell commands — navigation, file ops, permissions, processes, networking, text processing, pipes and more.
CSS Cheat SheetNew
Essential CSS properties — Layout, Flexbox, Grid, Box Model, Typography, Backgrounds, Animations, Selectors, and Custom Properties.
JavaScript Cheat SheetNew
Modern JavaScript essentials — Variables, Types, Functions, Arrays, Objects, DOM, Async/Await, Promises, and ES Modules.
Docker Cheat SheetNew
Essential Docker commands — images, containers, volumes, networks, Compose, registry, and system cleanup. Search and copy instantly.
Vim Keyboard ShortcutsNew
Essential Vim keybindings — navigation, insert mode, editing, visual mode, search & replace, windows, ex commands, and text objects.
HTTP Headers ReferenceNew
Complete HTTP headers reference — request, response, caching, CORS, security, authentication, and content headers with examples.
TypeScript Cheat SheetNew
TypeScript reference — basic types, interfaces, unions, generics, utility types, type narrowing, enums, and advanced type patterns.
React Cheat SheetNew
React + TypeScript reference — components, props, useState, useEffect, hooks, events, lists, context, and performance patterns.
Tailwind CSS Cheat SheetNew
Tailwind CSS reference — layout, Flexbox, Grid, spacing, sizing, typography, colors, borders, effects, and responsive / dark-mode utilities.
Markdown Cheat SheetNew
Complete Markdown syntax reference with live previews — headings, emphasis, lists, links, images, code, tables, task lists, footnotes and GFM.
Bash & PowerShell ReferenceNew
Side-by-side reference of common Bash and PowerShell commands. Search by task and copy the Bash or PowerShell equivalent with one click.
ASCII Code TableNew
Full ASCII code table (0–127). Look up decimal, hexadecimal, octal, binary, and HTML codes for every control and printable character.
HTML Entities & EmojiNew
HTML entities, special characters, and emoji reference. Copy named entities, numeric references, Unicode code points, or the character itself.
Ports & MIME TypesNew
Reference of common TCP/UDP port numbers and MIME (media) types. Search by port, service, file extension, or content type and copy with one click.
Resistor Color Code CalculatorNew
Decode 4, 5 and 6-band resistor color codes both ways — pick band colors to get resistance, tolerance and temperature coefficient, or enter a value to see the bands.
AWG Wire Gauge ChartNew
American Wire Gauge reference. Convert AWG to diameter (mm), cross-section (mm²) and approximate current capacity, from 0000 to 40.
Capacitor Code CalculatorNew
Convert 3-digit capacitor codes (e.g. 104 → 0.1µF / 100nF) to pF, nF and µF. Includes a full code chart and tolerance letter table.
Ohm's Law CalculatorNew
Enter any two of voltage, current, resistance and power to compute the other two. Uses V=IR, P=VI, P=I²R and P=V²/R with unit-aware inputs.
Tap Drill Size ChartNew
Tap drill sizes for metric threads — look up the recommended pilot hole diameter for M2–M20 coarse and fine threads by pitch.
Metric Thread Pitch ChartNew
Metric thread dimensions for M1–M30 — coarse and fine pitch, pitch diameter and minor diameter. Look up by nominal size.
ISO Tolerance & Fits TableNew
ISO limits and fits lookup — find upper and lower deviations (µm) for common hole/shaft symbols like H7, g6 and p6 across size ranges.
Bolt Torque ChartNew
Recommended tightening torque for metric bolts (N·m) by nominal size (M3–M20) and property class (4.8, 8.8, 10.9, 12.9). Reference values only.
dB / dBm ConverterNew
Convert between dBm and watts, and between power/voltage ratios and decibels. Covers 10·log and 20·log, with a handy reference table (0dBm=1mW, +3dB≈×2).
Logic Gates Truth TableNew
Truth tables and symbols for AND, OR, NOT, NAND, NOR, XOR and XNOR — with MIL/ANSI and IEC symbols, Boolean expressions and interactive input toggling.
Hardness Conversion TableNew
Approximate hardness conversion for steel — HRC ↔ HB ↔ HV with tensile strength. Look up a value to find the nearest equivalents (ASTM E140 / JIS based).
GD&T Symbols ReferenceNew
All 14 geometric tolerance characteristics (ISO 1101 / ASME Y14.5) — symbol, category, datum requirement and meaning, plus datum and modifier symbols.
UART / I2C / SPI ReferenceNew
Compare the three embedded serial protocols — signal lines, sync/async, master/slave, speed, full/half duplex and pros & cons, plus common UART baud rates.
Connector Pinouts ReferenceNew
Pinouts for common connectors — USB-A/C, RJ45 (T568A/B), DB9 (RS-232), HDMI, 3.5mm TRS/TRRS and Raspberry Pi 40-pin GPIO. Search by connector type.
Surface Roughness (Ra/Rz)New
Surface roughness reference — approximate Ra ↔ Rz, old triangle symbols, N1–N12 grades and typical machining methods, with ISO 1302 indication notes.
Metal Material Grades (JIS)New
Common metal material grades — steel (SS400, S45C, SUS304…), aluminum (A5052, A2017, A7075) and copper alloys, with features and typical uses. Searchable.
SI Prefixes (Metric)New
Metric prefix reference from quetta to quecto — symbol, name and power of ten, with a converter (e.g. 4700µF = 4.7mF) and notes on binary prefixes (Ki/Mi).
Battery Sizes & TypesNew
Battery size reference — AA/AAA/C/D, 9V, coin cells (CR2032, LR44) and 18650, with dimensions, voltage, capacity, chemistry and IEC/ANSI/JP naming.
Drill Size ChartNew
Drill bit size conversion — number (1–80), letter (A–Z), fractional and metric (mm) equivalents, with a lookup to find the nearest size in each system.
O-Ring Size ChartNew
Common O-ring sizes for JIS B 2401 (P/G/S) and AS568 dash numbers — nominal designation, inner diameter and cross-section (CS), with size lookup.