Everything in the catalog

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Generates look-alike domain permutations for a domain and checks which are registered, to spot phishing.

Computes monthly repayments and total cost for repayment or interest-only mortgages.

Generates secure diceware passphrases from word lists in the browser.

Metronome that raises its tempo automatically to help practice a passage at increasing speed.

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Minimalistic minesweeper inspired by Monkeytype, with Vim-style keyboard controls.

Solves sudoku from a camera or uploaded photo, running recognition in the browser.

A customizable web-based template editor utilizing Javascript, designed to create personalized resumes and letters in a variety of formats.

Rolls physics-based 3D dice you can throw on the screen, in standard polyhedral sizes.

Crossword grid filler that generates dense grids quickly from a dictionary.

Visual UK take-home pay breakdown covering income tax, NI, pension relief and salary sacrifice.

Try JMESPath expressions against JSON in an interactive tutorial and tester.

Tetris played with triangle-shaped blocks that fit together differently from the classic pieces.

Collection of calculators for education, professional, scientific and health use.

Browser-based 2FA code generator offered as an alternative to authenticator phone apps.

A visual designer for laying out multi-agent systems for Claude Code.

Wordle at extreme scale: solve thirty-two boards simultaneously within thirty-seven guesses.

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Faithful Minesweeper clone in the browser built with a retro look.

The family organizer for the people you live with: shopping lists, to-dos, calendar, spending, projects, recipes and more.

A first-person shooter game that runs in the browser from a single HTML file.

React app that creates secure random passwords and passphrases with length and character options.

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