Everything in the catalog

Generates and checks HMAC-SHA256/384/512 signatures using Web Crypto.

Paste response headers to check Content-Security-Policy, Strict-Transport-Security, CORS and cookie attributes; no live request is made.

Escapes or unescapes special characters in JSON strings in the browser.

Plots a JSON document as a physics-style graph where each node is an object, array or value, rendered locally.

Loads a .parquet file with DuckDB-Wasm so you can browse rows, see column types, query it in SQL and save a CSV or JSON copy.

Produces strong passwords or word-based passphrases, several at once, using the browser's secure random source.

Points at a remote MCP endpoint to browse the capabilities it exposes and try calling one with your own arguments.

Looks through snippets, log output or environment files for leaked credentials and masks what it finds, all in the page.

Counts characters, words and lines, keeping the text in the browser.

One page of text helpers: change case, slugify, sort or dedupe lines, regex find and replace, counts, hidden whitespace check.

Reads a certificate in PEM or DER form in the browser and lists who it was issued to and by, its dates, alternate names and hashes.

Beautifies XML and flags syntax errors immediately, processing the text locally.

Checks XML for malformed tags, nesting and attribute errors and reports document statistics locally.

Estimates depth from a single image with Depth Anything running through WebGPU.

Semantic search over audio clips powered by Transformers.js models running in the browser.

Calculates training heart rate zones for runners.

Adjusts running paces for hot conditions.

Pace chart for converting running paces and finish times.

Runs an agent loop in the browser tab on top of a ternary Bonsai 2 model using WebGPU.

Vector search over documents using a Postgres running in WebAssembly (PGlite) inside the browser.

Detects objects in a video stream frame by frame with a model running on WebGPU.

Large on-screen timer for tests and timed activities.

Splits a class list into random groups of two to five.

Build your own Jeopardy-style review game with pictures and score keeping.