Made 30+ dev/marketing tools that run 100% in the browser - no backend, no tracking, no login

Quick share of something I built recently. I've been working on a SaaS product and along the way kept needing small utilities for myself: QR codes, UTM links, OG tag previews, schema markup, robots.txt, sitemap, base64/URL encoders, etc. Every site I found for these either required an account, was buried in ads, or made me wonder where my data was going. So I built clean versions and put them at reslug.com/tools . All free. No account. The interesting bit: every tool runs entirely client-side. The QR code generator never sends your WiFi password to a server. The UTM builder never logs your URLs. The schema generator outputs locally. The redirect checker is the only exception, since CORS forces a server proxy for that one (and it doesn't log the URLs it checks). Stack for the free tools: React 19 + Vite + TypeScript + Tailwind, qrcode library for QR generation, all rendered as pure components. Main product behind it is .NET 9 + Postgres but you'd never hit that from /tools. Why I'm posting: curious what's missing. I've got about 27 more tools planned but I'd rather build what people actually need. Also genuinely interested if anyone has feedback on the UI/UX - I rebuilt the hero last week and I'm not 100% sure it's better. https://reslug.com/tools submitted by /u/ervistrupja [link] [留言]