IrisA private Flo alternative
Looking for a period tracker like Flo, without a subscription or your data leaving your phone? Iris does the core of what Flo does, keeps everything on your iPhone and has no account.
Iris and Flo side by side
| Iris | Flo | |
|---|---|---|
| Price | Every feature free; a one-time purchase removes ads | Free version, plus Flo Premium, a subscription |
| Privacy record | No Iris servers to share data from | FTC order in 2021 over sharing health data with Facebook and Google (FTC, June 2021) |
Checked 2026-10-05. Plans and policies change; see each company's own pages.
What Iris covers
- Period predictions from your own cycles, with the next period counted forward from ovulation
- A likely window for irregular cycles and PCOS
- BBT chart with a coverline, and LH test logging
- Partner sharing, view only and end-to-end encrypted
- Two-way Apple Health sync, widgets and cycle-aware reminders
- Pregnancy, postpartum and hormonal contraception modes, and a PDF report for your doctor
What Flo has that Iris doesn’t
Flo is a much bigger product, with a large library of expert articles and videos and an AI health assistant. If those are what you want, Flo is the better fit. Iris is for people who want a tracker that is complete, free and keeps their data to themselves.
Moving over
If you have kept your periods in Apple Health, Iris reads them in. Otherwise enter your last few period dates on the calendar and predictions start from there.
Questions
Is Iris really free?
Yes. Every feature is free. A few ads pay for the app, and a one-time purchase removes them. There is no subscription.
Is Iris on Android?
No. Iris is for iPhone and iPad.
Iris is not a contraceptive. Its predictions are estimates, and it never marks a day as safe.