Predicts your period as a realistic range with a confidence level, not a fake-precise date.
Honest ranges instead of guesses, and the app tells you how sure it is, so you can plan around reality.
Nothing uploaded, nothing sold, no account required. Delete the app and your data is gone. That's it.
A free tier that's actually useful, full price shown before you start, and one-tap cancel. No weekly-trial traps.
Private by design. Educational, never diagnostic.
Most period apps assume a tidy 28-day cycle and predict a confident date. If your cycle is irregular or you have PCOS, that date is usually wrong, and the app spends half the month telling you you're “late.”
Ebb was built after reading through thousands of one-star reviews of the big trackers, all describing the same failures: wrong predictions, paywall traps, and data sold on. So Ebb does the opposite: honest ranges with a confidence level, a genuinely useful free tier, and everything kept on your phone.
The founder, Xtenza Tech
Yes. The full prediction engine, logging, calendar, and history are free forever. Premium ($39.99/yr) adds deeper AI insights, but the accuracy that matters is not paywalled. Full price shown up front, one-tap cancel, no weekly-trial traps.
Those apps predict a single confident date by averaging your history, which breaks on irregular cycles. Ebb predicts a range with a confidence level, built specifically for cycles that vary, and it keeps all data on your device rather than on company servers.
Yes, by design. No account, no sign-up, nothing uploaded to any server. The prediction runs on your phone. Delete the app and the data is gone, because there was never a server copy.
That is exactly what it is built for. The more variable your cycle, the more honest its range gets (it widens and tells you it is less certain) instead of pretending to know a date.
Free to start. No account. Your data never leaves your phone.
Download on the App Store