BreathInU is still alive! I have been slowly updating the application to fit more what you are looking for. By updating the home page, you now have a better way to access the exercises, and a clearer way to check our flows through the day.
With iOS/macOS 26 being released, BreathInU needed being refreshed to make sure it matchs all new paradigms with Liquid Glass. Launching the project here on ProductHunt would have been a bit too early, specially since great Swift/SwiftUI components have been released.
Now my goal is to finalize the new version, make sure you can easily access all features on your iPhone, iPad or mac. In the meantime, you can already download the app from the AppStore.