Everything in the catalog

Free puzzle game that can be played in any modern browser.

Opinionated demo for compressing JPEG and other images in the browser.

Paste JSON to beautify it, pretty print it and explore it as a collapsible tree.

Browser-based Rubik's cube solver where you paint the faces and get a move list.

Write concise code-like text and get an interactive sequence diagram rendered without a server.

Crypto gain and loss tax calculator for trade histories.

Minesweeper where several kinds of mines overlap with each count combining multiple types.

A Web Application generates Invoices as PDFs to your device using html-to-image and jsPDF.

Checks whether your bag meets carry-on luggage size rules for airlines.

Estimates taxes owed by Romanian PFA sole traders (Romanian language).

Single-file web page that produces TOTP codes from your secret without an account.

Calculates UK capital gains and dividend tax on investments, including corporate actions.

Privacy-focused online text diff tool that creates and shares comparisons.

Small Alpine.js and Tailwind invoice generator that builds an invoice from your inputs.

Character builder and digital sheet for Pathfinder and Starfinder 2e with built-in rules lookup.

Creates QR codes for text, email, WiFi and more directly in the browser, with no limit.

Tables, lists, tokens and scenery for D&D 5th Edition, gathered for quick lookup at the table.

Design printable paper miniatures for tabletop games from images and layouts.

Typing test dressed as a game: your speed climbs a Scoville scale of spiciness.

Auto-detects pasted strings such as JWT, JSON, base64, URI, timestamp or gzip and shows the decoded view.

Turns pasted JavaScript into a draggable bookmarklet link.

Play chess against a Stockfish bot at six difficulty levels, with optional move hints.

Explains a cron expression in plain words, field by field, and lists the next ten run times.

Encodes and decodes the affine cipher with chosen coefficients.