Hi HN, I'm building skins.dev : Most AI tools help you build your own tool from scratch, but usually there's already a tool that gets you 80% there. Skins is for the other 20%: you describe what's missing in a web app you use, and we handle the rest, whatever it takes: from simple JS scripts and styles up to new backend features (hosted on our Cloudflare-compatible serverless cloud), so your feature can call other APIs and even have its own SQLite database.

How it works: go to the page you'd like to change and press "Record" in the extension. We use the DOM snapshots and network requests to build a replica environment where coding agents can iterate safely. The Chromium extension then injects the changes per site via chrome.userScripts (à la Tampermonkey).

I'm building a library of ready-made templates, inspired by long-open feature requests on SaaS forums (Salesforce, Jira, HubSpot): https://skins.dev/blog/

Currently Chromium only (we're working on getting the latest version into the Chrome Web Store). I would love feedback, and curious what you'd change first in a tool you use daily :)