← OnyxRhythm · All launch news
Launch announcement
OnyxRhythm Launched on Google Play on April 21, 2026
Google Play launch:
Page added . This is a record of the launch for our news archive, not a press release issued at the time. The date is the first production release of OnyxRhythm on Google Play.
OnyxRhythm, a dark-minimal period tracker, became available for Android on Google Play on April 21, 2026. It is made by Sun Engineering LLC.
What OnyxRhythm does
- Tracks periods, symptoms and your fertility window.
- No community, no advice feed, no cloud.
- Works offline once your subscription is active.
Pricing
OnyxRhythm requires a subscription: $0.99 per month or $9.99 per year.
Availability
Google Play (Android).
- Google Play: https://play.google.com/store/apps/details?id=com.onyxrhythm.onyx_rhythm
- More information: https://sunnyengineer.com/OnyxRhythm/
About Sun Engineering LLC
Sun Engineering LLC is an independent developer of privacy-minded apps for travelers, readers and families.
Contact: Henk de Swardt, Sun Engineering LLC — https://sunnyengineer.com
