By OP’s definition mine is not a successful business, but wanted to share anyway. I build and run https://onetracker.app https://onetracker.app. In 2020 it gen

By OP’s definition mine is not a successful business, but wanted to share anyway. I build and run https://onetracker.app https://onetracker.app. In 2020 it generated about $1-2k/month in revenue from ads and IAP. I started it due to my need for a privacy-respecting and automated service for tracking deliveries. It’s nowhere close to becoming the majority of my income, but it’s been a fun experience developing and running it.