Onda
The private period tracker that learns your cycle.
Know when your period is coming — with an honest range, not a guess. No account, no cloud, no ads: your journal stays on your iPhone and goes only where you send it.
Coming soon on the App StoreHonest predictions
Your next period, estimated fertile window and ovulation as a range that narrows with every cycle you log. LH tests and basal temperature sharpen it.
Private by design
No account, no server, no analytics, no ads, no trackers. The App Store privacy label reads “Data Not Collected”. Face ID lock and discreet notifications included.
Free where it matters
Logging, predictions, the calendar, reminders, widgets, Siri, Apple Health sync and backups are free. Onda Pro adds your patterns, temperature and LH charts, a report for your doctor and unlimited questions to the on-device assistant.
For every stage
Track your cycle, try to conceive, follow a pregnancy week by week, or navigate perimenopause.
Onda is not a method of contraception and does not diagnose or treat any condition. Predictions are estimates.
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