Track your period without sharing your data: Rhythm, Flo or Clue?
By MyIdeApp, the studio behind Rhythm. Comparison based on each app's official pages. Read in FR · ES
The short answer
Rhythm stores your cycle only on your phone, with no account: no data goes to a server. Flo sends your data to its servers but offers a free anonymous mode that prevents linking it to your identity. Clue stores it on EU-based servers if you create an account; otherwise it stays on the device without backup.
Comparison
| Criterion | Rhythm | Flo | Clue |
|---|---|---|---|
| Price | Free, Premium $3.99/month or $24.99/year | Free, Premium subscription | Free, Clue Plus subscription |
| Account | No account needed | Anonymous mode available, no name or email | Optional |
| Where your data is stored | Only on your phone | On Flo's servers (not linked to your identity in anonymous mode) | EU-based servers with an account, otherwise on the device |
| If you change phones | Your data follows your iPhone backup | Recoverable with an account, lost in anonymous mode | Recoverable with an account, lost without one |
Why choose Rhythm
- Nothing leaves your phone: no server, no account, nothing to hack or request.
- Period and ovulation predictions, 4 cycle phases, symptoms, mood, pill reminders: free.
- Widget, calendar export, Apple Health sync.
- Premium ($3.99/month or $24.99/year) adds insights by phase and a PDF export for your doctor.
When another app is a better fit
Flo and Clue have years of health content and a very large community. If you want your history on a new device without relying on your iPhone backup, a Clue account (EU servers) is a solid option. If you want Flo's content without being identifiable, turn on its anonymous mode.
Frequently asked questions
Does Rhythm send my cycle data anywhere?
No. Everything is stored on your device; you can use Rhythm without an account.
Does Rhythm predict ovulation?
Yes, from your own data: next period, ovulation window and the 4 cycle phases. It is not a method of contraception.
How much does Rhythm cost?
Download and tracking are free. Premium costs $3.99/month or $24.99/year in the US.
Sources
Information checked on October 11, 2026. Other apps' offers may change: check their store listing before subscribing.