Browse all apps

An interactive duration picker for hours, minutes, and seconds. Scroll or type to set precise time durations — clean, lightweight, no dependencies.

by nadchif

A realistic rotary knob control you can twist with your mouse or finger. A satisfying, tactile web component for adjusting values.

by denilsonsa

Calculate simple and compound interest instantly. Enter principal, rate, and time to see how your money grows — works offline as a progressive web app.

by SafdarJamal

Test your gamepad or controller in the browser. See real-time button presses, joystick movements, and axis values for any connected controller.

by Tom32i

Compute mean, median, mode, standard deviation, and more from a data set.

by Launch Arcade

Convert between binary, decimal, octal, and hexadecimal number systems.

by Launch Arcade

Calculate pace, finish time, or distance for running and cycling. Includes mile/km splits table, preset race distances, and imperial/metric support.

by Launch Arcade

Build and simulate electronic circuits with drag-and-drop components including logic gates, LEDs, switches, and more.

by kazuhikoarase

Calculate tips based on bill amount, service quality, and number of people splitting.

by frankiefab100

A web-based logic circuit simulator. Place gates, connect wires, and build working digital circuits right in the browser.

by RednibCoding

Convert between units of length, weight, temperature, volume, and more.

by Launch Arcade

Define states, symbols, and transitions, then watch a Turing machine execute step by step.

by VittGam

Build and simulate digital logic circuits with AND, OR, NOT, XOR gates, LEDs, and clock signals.

by RednibCoding

Calculate derivatives of any math expression and see the result plotted on an interactive graph. Supports functions, constants, and complex expressions.

by PB2204

Roll beautiful 3D dice right in your browser. Supports multiple dice types (d4, d6, d8, d10, d12, d20) with realistic physics and animations.

by sarahRosannaBusch

A polished color picker with web colors, theme palettes, and custom color selection. Pick from a familiar Office-style interface or enter hex and RGB values directly.

by evoluteur

Calculate your Body Mass Index based on height and weight to evaluate your health status and determine your ideal weight range.

by abhigyan02

Design color gradients and export to CSS, SVG, Python, and more. Shareable via URL.

by eltos

A page displaying every standard HTML5 element. Great for testing CSS themes, browser rendering, and learning HTML5 tags.

by cbracco

Convert text to Morse code and back. Listen to the encoded message with audio playback.

by arindal1

The Cyber Swiss Army Knife: encoding, hashing, encryption, compression, and hundreds more operations.

by GCHQ

A score tracking leaderboard. Add players, submit scores, and see rankings update in real time. Great for game nights.

by Muhammad0602

A visual interface for experimenting with audio synthesis, effects, and processing using Web Audio API nodes. Connect oscillators, filters, and other audio components to create custom sound chains.

by kellda

Compress JSON into ultra-short URL-friendly strings. Paste JSON, get a crushed version you can share in URLs or query params.

by KilledByAPixel

A simple, responsive drawing pad that works on desktop and mobile. Pick colors, adjust brush size, undo strokes, and sketch freely on an HTML5 canvas.

by tsand

Paste raw JSON and get clean, formatted output instantly.

by Launch Arcade

An interactive JavaScript console. Type JavaScript, see results instantly. Perfect for experimenting and learning.

by openexchangerates

Drag-and-drop digital logic circuit simulator. Build circuits with AND, OR, NOT, flip-flops, LEDs, and more.

by Kazuhiko Arase

Calculate voltage, current, resistance, and power using Ohm's law.

by Launch Arcade

Calculate how your savings grow over time with compound interest.

by Kraftbit

Convert between Celsius, Fahrenheit, and Kelvin instantly. Enter any temperature and see all three units update in real time.

by TheNewC0der-24

Add, subtract, multiply, and divide fractions with ease.

by Launch Arcade

Generate unique pixelated avatar icons from any text. Type a name or email and get a distinctive, colorful identicon instantly.

by laurentpayot

A Wordle-inspired game for binary numbers. Guess the hidden 8-bit unsigned integer in 8 tries using binary, decimal, or hex input.

by James-Livesey

Calculate your Total Daily Energy Expenditure. Get your BMR, maintenance calories, and targets for fat loss, maintenance, and bulking.

by Launch Arcade

Plot mathematical functions in real-time on an interactive graph. Supports trigonometric, logarithmic, and polynomial functions.

by Abhrankan Chakrabarti

Convert Scratch projects into standalone HTML files. Upload a Scratch project and download a self-contained web page you can share.

by SheepTester

A minimalist speed reading tool. Paste text and read at up to 500 words per minute using rapid serial visual presentation.

by Zolmeister

A live-coding music sequencer where every letter of the alphabet is an operator. Route signals through a 2D grid to generate sound.

by Hundred Rabbits

Estimate your body fat percentage using the U.S. Navy method. Get fat mass, lean mass, and body composition category.

by Launch Arcade