I built 27 free tools solo, no signup, no team. What should I build next?

Hey everyone. I've been building lolaztool.com solo for the past few months, browser based tools with no login and no backend.

Right now there are 27 tools live: unit converters, QR code generator, habit tracker with streaks, image compressor, and more. Everything runs entirely client side, so nothing you type or upload ever touches a server.

Launching this on Product Hunt tomorrow (Aug 8) and would genuinely love feedback before then. Two questions for this community:

1. What's one free tool you always wish existed but never found?

2. Anything you'd change about a first time solo launch strategy?

Happy to return the favor and check out what you're building too.

lolaztool.com