On: I made a guitar tuner app using Flutter and Rust

[rock_artist]

Sometimes, But a similar "utility" (shameless promotion here) I've made a free open source metronome. No ads and cross-platform.

https://tick.talaviram.com

So if someone like me had incentive for free metronome. I'm pretty sure there are also tuners out there.

Still, 1$ to support an app is really legitimate and sometimes gives more incentives for the developer to maintain it or add features.