Lunavault: On-Device Period and Cycle Tracker Seeking Testers

Lunavault is a private, on-device period and cycle tracker for Android that requires no account or cloud storage. The developer is seeking testers for their Google Play closed testing program, requiring opt-in for a 14-day testing window. To join, users need to add themselves to the Google group, accept the invite program, and then download the app. The developer is willing to reciprocate by testing other apps.