This is a minimalist heart rate monitor that display data from your Bluetooth heart rate sensors like Polar H7. It doesn't require any personal data or configuration.

It also works great with Android Wear. And the watch app works without the phone and is battery efficient.

The usage is very simple. Bring up the app and you should see your heart rate straight away as long as the heart rate sensor is turned on and in range. Disconnect on the phone app if you want to display data on your watch.

It's tested with Polar H7, but it should work with all Bluetooth heart rate sensors. Let me know if any device doesn't work.