I launched Roversia on Product Hunt — 39+ free browser tools, zero frameworks

Today I launched Roversia on Product Hunt — a free, ad-free platform of 39+ browser-based utility tools I've been building solo. The stack is deliberately minimal: vanilla JavaScript, no frontend framework, no bundler. Backend is Firebase (Auth, Firestore, RTDB, Storage) with Netlify Functions for the few things that need server-side logic — PDF processing, API proxying, that kind of thing. Zero recurring server costs was a hard constraint from day one. Some of the tools run entirely client-side, including AI-powered ones — background removal runs fully in-browser via ONNX/Transformers.js, no server round-trip. If you're curious about the implementation details, I've been writing about specific pieces on this blog — Firebase auth patterns, PWA architecture, that ONNX integration, and more. Would genuinely appreciate feedback on Product Hunt if you have a minute, especially on which tools are most/least useful: https://www.producthunt.com/products/roversia?utm_source=devto&utm_medium=social