Besides crashing sometimes when I open it, this app often fails to record data properly from the device. I wear it on my wrist all night, and I see the blue Bluetooth light along with spo2 and o2 numbers, but then the app will sometimes show no or little data in the report for the night. I don’t know where the failure is, but the app seems problematic since the device itself is displaying the expected results. And sometimes, the app shows dangerously low o2 levels (70s and 80s) which I know are false because I was awake and breathing fine when these events supposedly occurred, or I wasn’t even wearing the device when it showed those results.I am doing this as part of a research study, and look forward to when it’s over!