9to5Mac:

Heart Analyzer is a great third-party app that allows you to see incredible detail from Apple Watch heart rate readings. In an update today, the app has added live heart rate support, improved complications for Series 4 users, and more.

With support for live heart rates, Heart Analyzer will now record your heart rate in real-time when you have the app open. This allows you to get detailed information about your heart rate at specific times, and view trends and graphs over time.

I’ve been using this app for a couple of days and for data nerds, there’s a wealth of interesting info included.