Just tried to check it out. First boot it crashed, killed app and tried again and now it won’t open. I’ll try and reinstall and do over. iPhone 16 Pro, iOS 18.1

Quick edit- I did exactly that and now it works fine. First boot up before seemed like it got stuck when asking for permission to use the camera.

Glad it worked on second boot! We used to have some bugs in the elliptic integral implementation that led to the app crashing, but we think we've eliminated those, so hopefully this is just a fluke... Anyone else with this issue?