4 stars: Very in depth analysis, just wish the UI was refreshed to look a bit more modern, app hasn't been updated for a long time but it still works great.
5 stars: This app brings more than I could think of as I was looking for a heart rate app that uses a Samsung Galaxy heart rate monitor instead of a camera. I also wanted to save the output, since that's impossible in the Samsung Health app. This app shows a lot more data than just the heart rate. I'm considering to get my doctor's degree to understand it all. Anyway, great app and I would be happy to contribute in some way!
5 stars: This is the most usefull heart rate app for my edge s6. I wanted to code something like this but you did it first. It gives very reliable measurements of SI RI and AI for middle aged adults. For very young and old it often misses PTT (pulse-wave transit time). I can easily correct that manually. Nevertheless, it is great and very useful. I suppose other didn't appreciate depth and thoroughfulness of analysis this software perform. Bravo!
4 stars: If you have a Samsung Galaxy with heart rate and O2 sensors, this is the app that's not Samsung bloat or ad-ridden. I like the data displayed as distributions. I would give five stars if the data were shared with Google Fit (something Samsung's health app won't do).
5 stars: Excellent! I've tried others without success. This one, you can actually see the wave as the heart beats. The waveform matches the ECG at the hospital.
5 star...