CollateKit — collatekit.com
I kept doing the same thing: need to format some JSON, open a random site, squint at the ads, get my output, close the tab. Repeat for base64, repeat for regex, repeat for UUID generation. So I built one site with all of them.
What it does
16 tools, one place, everything runs client-side:
- JSON Formatter & Validator — paste messy JSON, get it readable
- Regex Tester — live match highlighting as you type
- Base64 Encoder/Decoder
- UUID Generator
- Color Converter — HEX/RGB/HSL, back and forth
- Word Frequency Counter
- Duplicate Line Remover
- Random Line Picker
- Markdown to HTML Converter
- ...and a handful more text-manipulation tools I kept needing myself
Why client-side matters here
Nothing you paste gets sent anywhere. Your JSON, your regex, your text — it's processed in your browser and never touches a server. For tools like this, that's not a privacy feature I'm marketing after the fact, it's just how it should work. There's no reason a JSON formatter needs your data.
How it's built
- Astro for the site — I wanted static, fast-loading pages with zero JS shipped unless a tool actually needs it
- Tailwind for styling
- Cloudflare Pages for hosting
Astro's island architecture turned out to be a good fit for "16 independent tools" — each one only loads the JS it needs, so the JSON formatter isn't shipping code for the color converter.
What's next
Still adding tools based on what I personally keep needing. If there's a text/dev utility you reach for constantly and wish existed without ads plastered over it, tell me — genuinely taking requests.
collatekit.com — free, no sign-up, no data leaves your browser.
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