Show HN: 12 Years Building an Interval Timer App

In 2013, I couldn’t find a decent interval timer for my workouts on the Android Market (Google Play wasn’t even called Google Play yet!). Could you believe that? Typing 'interval timer' returned nothing! So I decided to build a simple App while in college. Fast forward 12 years, that simple timer has grown into an ecosystem: Android, iOS, Wear OS, Apple Watch, and a coaching platform. All built solo, with no AI assistance, and redesigned 4 times to keep up with UI trends. Over the years I’ve learned a lot about long-term app maintenance, cross-platform challenges, and keeping codebases alive, shifting frameworks, database migrations and OS updates. Here's to all the solo indie App Developers out there!