CapyToolkit started the way a lot of side projects do: a solo developer got tired of online utilities that demand an account, an upload, or an email address before doing ten seconds of work. The answer is a free suite of 45+ browser tools where nothing you touch ever reaches a server.
The catalog is deliberately practical. Test a gamepad for stick drift, measure a mouse polling rate, check a screen for dead pixels, analyze webcam lighting, or measure microphone noise floor and round-trip latency. The same site decodes JWTs, formats JSON, strips GPS data from photos, scores readability, and checks WCAG contrast. Eight categories cover hardware, developer, security, audio, math, text, design, and network work.
It runs as a plain website, an installable PWA, or a Windows app from the Microsoft Store, and works offline once installed. Every tool page includes examples and a short how-to, and a blog documents the same hardware and security topics in depth. Free, no account, staying free.
The suite is built for indie makers, early adopters, PC builders, streamers, and everyday users who need a fast hardware or text check. Nothing is uploaded, nothing is stored, and no account is needed, so private files and inputs stay on the device.
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