Step-by-step fixes, checks, and browser workflows.
Measurements, setup notes, and sound-system fundamentals.
Local-first workflow notes for developers.
Practical ways to handle files and data safely.
How to test peripherals and interpret the results.
Resistor codes, Ohm's law, and battery capacity math.
Guides for developers who keep their work local, covering the small jobs the browser tools on this site handle in seconds without anything leaving your machine.
How hash functions work, which algorithms are safe in 2026, how HMAC protects webhooks and APIs, and how to run it all locally with CapyToolkit.
How Base64 encoding works at the byte level, why client-side browser encoding eliminates data exposure, and practical workflows for sensitive data.
Filter and search gigabyte-scale log files locally in your browser with Web Workers and IndexedDB, zero uploads, no server, no PII exposure on the wire.
Count tokens, context usage, and input costs for 35+ AI models entirely in your browser before any prompt reaches an API. Prices updated daily, works offline.
Measure direct browser latency, jitter, and packet loss with zero-cloud WebRTC tools. No servers, no uploads, no TURN relay.
Query and debug Parquet files locally with SQL, inspect schemas, validate data, catch errors before they reach production.
Learn to validate cron expressions locally with CapyToolkit's parser, avoiding sensitive schedule exposure and catching errors before deployment.
Understand HEX, RGB, HSL, HSV, OKLCH and when to use each format in production CSS. Includes client-side workflow tips using CapyToolkit's converter.
Inspect JWT tokens locally: no upload, no network, full privacy. Decode headers, claims, and expiry in-browser for debugging, development, and documentation.
Installing puts every tool one tap from your home screen, no browser required.
It stays cached locally, so tools keep working on a plane, on a locked-down network, anywhere signal doesn't reach.
Search tools, blog posts and pages…
Install from Microsoft Store