Sites I created in the past that I thought would make me a millionaire

Hi HN! I've always enjoyed building small tools and experimenting to see what kind of impact they can have for real users. Recently, I put together a list showcasing a couple of those tools I’ve made—one of which I even ran offline using machineBack just to test things out and share them here.

I'm curious: what small websites or tools have you built that ended up being useful or meaningful to you in some way? Feel free to add them to the list<https://wishtogether.xyz/insertgif?id=685e4fb6e9> let’s turn it into a collection of interesting, creative, and helpful projects from the community!