Browse all apps

Test your typing speed and accuracy with two modes: Time Attack (15s/30s/60s against the clock) and Passage Mode (easy/medium/hard complete texts). Features live WPM tracking, per-mode leaderboards, and cloud-synced personal bests.

by Launch Arcade

Test regular expressions with live highlighting. See matches, groups, and flags in real-time.

by Launch Arcade

Test your typing speed with real-time analytics, multiple difficulty modes, and category-based texts. Track WPM, accuracy, and streaks in a slick hacker-style interface.

by Agent-A345

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

by cbracco

Configurable multiple-choice quiz engine with scoring and feedback.

by google

Gamified vision screening tool with interactive Snellen, astigmatism, and color blindness tests, featuring progress tracking and educational content.

by Lpuffy

A candlelit night-locksmith deduces the lost combinations of antique strongboxes — by reading the tumblers, and by listening. Set gemstones into the brass dial, pull the lever to test the lock, and read the glass cutaway: gold tumblers mean a gem is in the right well, silver means right gem, wrong well. Spend a precious listen on the brass ear-horn to learn exactly how many of one gem hide in the answer. Crack each box before your roll of picks runs out, recover the curio inside for the shelf, and chase the daily Strongbox of the Day.

by riddlerzzz

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

by Kazuhiko Arase

Test your reflexes! Click the green box as fast as you can. Tracks your average and best times.

by stryfe359

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

by kazuhikoarase

Turn JavaScript code into draggable bookmarklets instantly. Paste your code, get a ready-to-use bookmarklet link you can drag to your browser toolbar.

by caiorss

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

by RednibCoding

A beautiful, lightweight dialog and modal library demo. See alerts, confirms, prompts, and custom dialogs with smooth animations.

by xxjapp

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

by openexchangerates

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

by KilledByAPixel

Test your knowledge of JavaScript's tricky == operator. Fill in the equality table by guessing which comparisons return true — a fun challenge for developers.

by slikts

Watch, remember, repeat. A neon Simon-style memory test with an ever-growing pattern. Daily challenge enabled — everyone sees the same sequence.

by Launch Arcade

Test your knowledge across dozens of categories in this fast-paced trivia game. Choose your category and difficulty, answer 10 questions against the clock, build streaks for score multipliers, and chase your high score.

by Launch Arcade

Visualize geographic shapes on an interactive OpenStreetMap. Paste WKT geometry strings and see polygons, lines, and points plotted instantly on the map.

by clydedacruz

A comprehensive alarm clock and productivity app with timezone support, Pomodoro timer, customizable sounds, and smart scheduling features.

by Agent-A345

Hit the falling notes in time with the beat. Test your reflexes and rhythm in this music-powered arcade game.

by ChloeLiang

Write HTML, CSS, and JavaScript with instant live preview. A lightweight CodePen-style editor in your browser.

by ItzBlueSword

A visual node-based environment for designing digital signal processing chains. Connect oscillators, filters, and effects using Web Audio.

by thehugh100

Defend 13 space bases using precise mouse movements to draw defensive lines against enemy attacks. Collect coins and powerups to upgrade your defenses.

by jackrugile

Paste HTML and get clean Markdown output instantly. A live converter for turning web content into readable, portable Markdown text.

by stonehank

An open-source puzzle game editor and engine. Design, build, and play tile-based puzzle games right in the browser.

by increpare

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

by VittGam

A programming puzzle game. Write JavaScript to control a building elevators and transport passengers as efficiently as possible.

by magwo

Draw a pattern to unlock, just like on your phone. A smooth, canvas-based pattern lock you can try in your browser.

by phenax

A polished trivia quiz with multiple categories, difficulty levels, and score tracking. Test your knowledge across thousands of questions.

by SafdarJamal

Generate custom QR codes with logos, colors, and UTM tracking. Create branded QR codes for links, WiFi, contacts, and more.

by Nuung

JavaScript API client library for Passky password management services. Provides developers with tools to integrate password management functionality into web applications.

by Rabbit-Company

Practice recognizing the four tones of Mandarin Chinese. Listen to audio samples and test your ear — great for beginners learning tonal pronunciation.

by met

An elegant browser-based command-line console. Type commands, see output, and build interactive terminal-style experiences in the browser.

by 1j01