Browse all apps

Interactive visualizations of 40+ data structures and algorithms — trees, heaps, graphs, hash tables, sorting, and more. A classic CS education resource.

by dgalles

A lightweight web spreadsheet with formulas, cell formatting, merge, freeze panes, and multiple sheets. Excel-like editing in the browser.

by myliang

Convert tables between CSV, Markdown, SQL, and HTML formats instantly. Paste data in any format, edit it in a spreadsheet-like form, and export to the format you need.

by guntrip

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

by Launch Arcade

An idle clicker that teaches the history of particle physics. Build accelerators, discover particles, and fund CERN.

by particle-clicker

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

by Kazuhiko Arase

Edit, format, validate, and explore JSON with tree and code views.

by Launch Arcade

A powerful note-taking app with rich text editing, task management, and GitHub sync capabilities. Your data stays in your control with offline access and local storage.

by orayemre

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

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

by GCHQ

A powerful QR code toolkit — analyze, decode, and recover damaged QR codes step by step. See the internal structure, edit modules, and extract data from partial codes.

by Merricx

Track income, expenses, and budgets in a clean interactive dashboard. Set spending categories, view charts, and get insights into your financial habits — all stored locally.

by Agent-A345

Track time spent on tasks with a simple start/stop interface and local storage.

by dmajda

Drop GeoJSON, KML, or GPX files onto an interactive map to visualize geographic data instantly. Everything runs locally.

by makinacorpus

A mesmerizing wind particle visualization on a world map, powered by WebGL. Watch millions of particles flow with real wind data.

by mapbox

Plan custom workouts organized by days and exercise blocks with built-in timers, dark/light themes, and local data persistence with JSON export/import.

by FlorealRISSO

Convert Excel spreadsheets to Markdown right in your browser. Drop an .xlsx file and get clean tables, text, and images as Markdown — all processed locally, nothing uploaded.

by igapyon

Watch sorting algorithms in action. Compare bubble, merge, quick sort and more side by side.

by MauritzOrlinski

Personal budget dashboard with interactive charts, income and expense tracking, and real-time balance calculations.

by Fahed1401

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

by KilledByAPixel

Precision stopwatch with lap tracking and millisecond accuracy. Clean, distraction-free interface.

by Launch Arcade

Encode and decode Base64 text instantly in the browser.

by progers

Turn-based roguelike dungeon crawler powered by real D&D monster and spell data. Fight 334 SRD creatures, draft from 319 spells, and compete on the leaderboard.

by Launch Arcade

Explore all 118 elements with a beautiful glassmorphism periodic table. Search, filter, and learn about each element.

by independent-coder

A fun sentence mixing tool — type or paste text, rearrange phonemes, and create hilarious audio mashups right in your browser.

by MysteryPancake

Interactive animated solar system with 27 celestial bodies. Click planets and moons for detailed stats. Compare any two bodies side-by-side. Toggle orbits, labels, and moons.

by Launch Arcade

See public holidays across 202 countries on a visual calendar. Click any date to see which countries are celebrating. Great for scheduling across time zones.

by stryfe359

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 browser-based spreadsheet app inspired by Excel. Create cells, enter formulas, format data, and work with multiple sheets.

by kishanrajput23

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

A visual editor for creating and manipulating SVG paths. Click to add points, drag to adjust curves, and export clean SVG code.

by Yqnn

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

Interactive tool for visualizing sorting algorithms in action. Watch bubble sort, quick sort, merge sort, and more come to life with animated bar charts.

by MastanSayyad

A minimal time tracking app that follows the Pomodoro Technique, helping you work in focused 25-minute intervals. Features persistent timers, progress tracking, and task history.

by luckyshot

Paste raw JSON and get clean, formatted output instantly.

by Launch Arcade

A stunning cyberpunk-style interactive periodic table with 3D electron orbital visualizations and element heatmaps.

by SeanWong17

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

A feature-rich Pomodoro timer with picture-in-picture mode, white noise, task management, detailed statistics, and multiple themes.

by lazy-guy