About

sitekits.dev is a free toolkit for the people who build and run the web — developers, SREs, and security engineers. It exists because the tools we reached for daily were rarely clear about what happened to the data we pasted into them, and rarely explained the format they were parsing.

Principles

• Local-first. 68 of the 76 tools do all their work in your browser. Paste a token, a header dump, or a config and it is parsed on your machine — no upload, nothing to store.
• Say what happens. The few tools that need a server say so on the page, in this policy, and with a badge in every listing. Measurement is named the same way: the analytics that runs by default is cookieless, sets no identifier, and does not follow you across sites, and no Google tag or cookie loads until you agree to it.
• Written, not just wired. Every tool has a guide: what the format actually is, how to use the tool, worked examples, and the mistakes people hit. Each focus area has a longer field guide.
• Fast and keyboard-first. Pages are pre-rendered and served from the edge. Press / or ⌘K to jump to any tool without leaving the keyboard.

How it is built

Astro generates every page ahead of time; interactive tools are React islands that hydrate on the page they belong to. The handful of tools that cannot work client-side call a small Cloudflare Workers API. Tool metadata lives in one registry that drives the pages, the sitemap, the search index, and the privacy classifications on this site — so the labels cannot drift from the code.

Languages

The interface is available in English, Japanese, Chinese, Portuguese, Spanish, and French. Your browser language is applied on first visit, and whatever you pick from the footer is remembered.