Free tiny but useful web products

Hi guys, I was bored so I decided to just build things. the site has tiny but somewhat useful products. please check and let me know what you think. If you have recommendations for new products let me know.

The chord progression generator doesn't return correct chords, as it uses the Chromatic scale, while it should probably use a diatonic scale.

So for example for I-IV-V it gives me C, D#, E while it should give me C-F-G (https://www.justbuildthings.com/chord-progression-generator)

This should be easy to fix, though. To point you in the right direction, see e.g. - https://en.wikipedia.org/wiki/Roman_numeral_analysis - https://en.wikipedia.org/wiki/Chord_progression

Fascinating topic, keep up the work!

Very nice. Some are actually very useful. Suggestion: keep the sidebar on the left when inside an app, instead of requiring users to going back. Easier to explore the tools.

Really cool idea! Nice clean site and clever utilities.

What front-end tooling did you use? Did you use any CSS framework?

I like the idea but it screams LLM generated content to me.