Compare
Flo vs Mori
The short answer: Flo is a large, feature-rich tracker funded by a recurring subscription (about US$10/month or US$60/year) that requires an account and keeps your data on its servers. Mori is a small Android app that is free, needs no account, works fully offline, and keeps records on your phone unless you turn on encrypted sync (US$3.99, once).
Side by side
| Flo | Mori | |
|---|---|---|
| Price | Free tier with premium features locked; Premium ≈ US$10/mo or US$60/yr (varies by region) | All core features free forever; optional encrypted sync US$3.99 once, no subscription |
| Account | Required (email or social sign-up) before first use | None. An email is only needed if you opt into cloud sync |
| Offline use | App opens offline, but the account model and sync assume a network connection | Fully functional without network — recording, calendar, estimates, insights, export |
| Where records live | Flo's servers, tied to your account | On your phone by default; optional sync is encrypted on-device before upload |
| Data-sharing record | In 2021 the FTC finalized an order after Flo shared sensitive health data (including period and pregnancy intent) with Facebook and Google despite promising otherwise; a related class action followed | No ads, no tracking SDKs, no third-party sharing. The privacy policy states records never leave the phone unless you enable sync |
| Prediction style | Single predicted dates, backed by a large user dataset | Date ranges with an explicit basis and confidence level — estimates, never guarantees |
| Platforms | iOS, Android, web app | Android today (signed APK); iOS in progress |
| Languages | 20+ | English and Simplified Chinese |
Where they genuinely differ
Business model
Flo is a subscription business: premium features (deeper insights, some content) sit behind a recurring paywall. Mori is deliberately buy-once at most — nothing in the free tier is a trial, and the paid option is a single US$3.99 unlock for encrypted sync.
Data model
Flo's account architecture means your cycle history lives on company servers, which enables cross-device sync and their prediction models but also makes the data a shared asset. Mori has no account to attach data to; by default there is no server copy at all.
Track record on privacy
Flo settled with the FTC in 2021 over sharing period and pregnancy-intent data with Facebook and Google, and a separate class-action settlement followed in 2026. Mori is new and unproven by comparison — but its architecture (no account, local storage, no third-party SDKs) removes most of the mechanisms that caused Flo's problem.
Depth vs focus
Flo offers articles, chatbots, pregnancy tracking and a large content library. Mori intentionally does less: record, estimate with stated confidence, export, delete. If you want a content ecosystem, that is a real Flo advantage.
Which should you choose?
- Choose Flo if you want a polished ecosystem on iOS and Android, pregnancy/conception modes, a large content library — and a subscription plus an account are acceptable to you.
- Choose Mori if you want to log your period without creating an account, keep records off company servers, use the app offline, and never pay a subscription. Android only, for now.
FAQ
Does Flo require an account?
Yes. Flo asks you to sign up with an email or a social account before you can log anything. Mori requires no account at all — open the app and the calendar is ready.
Is Mori free where Flo charges a subscription?
Mori's core features — logging, calendar, estimates, insights, export, reminders and deletion — are free forever. The only paid option is encrypted cloud sync, a one-time US$3.99. Flo Premium is a recurring subscription (about US$10/month or US$60/year depending on region).
Are Mori's predictions as accurate as Flo's?
No app can guarantee an exact period date. Mori shows a date range with its basis and confidence level, and widens the range honestly when your history is irregular. Flo shows predictions too, but presents less of the underlying reasoning.