Every heart rate zone app I tried had the same problem. You start a workout, and then you have to keep the app open the whole time just to see your zone. Switch to music, check a message, glance at a map, and the number is gone.
Zonas fixes that. It puts your heart rate zone where you can actually see it. On your lock screen, in the Dynamic Island, or floating over whatever app you're using. One look and you know where you are.
It connects to your chest strap or arm band over Bluetooth, tracks your zone in real time, and saves everything to Apple Health. No account, no cloud, no extra steps.
I'm an independent developer learning what it means to make good software. Software that respects your time, works reliably, and doesn't try to be clever. Zonas will keep getting better as I do.
If something feels off or you have an idea, I'd genuinely like to hear it.
Questions, bug reports, feature requests, or anything else: