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Flo offers cycle predictions, symptom logging and privacy controls, but the available evidence does not support calling it safer—or less safe—than every other period-tracking app. The practical comparison is what data each app collects, how it handles identity and sharing, what users can delete or export, and which features disappear when privacy controls are enabled. Here is what Flo currently says about those points, alongside the limits of what can be verified about competitors.
What Flo includes, and what its predictions mean
Flo describes its service as covering cycle prediction, fertility, pregnancy support, health information and community. Its free-version help page lists cycle and ovulation predictions, more than 80 symptoms and events to log, custom reminders, Secret Chats and basic Partner Mode functions. The feature count is Flo’s own product description, not an independent assessment. Flo’s free-version feature list
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Predictions use dates entered by the user; Flo advises adding historical cycles to improve them. A predicted date is an estimate, not a diagnosis or guaranteed method of contraception. The app’s broader description is available in Flo’s “What is Flo?” help page.
What data does Flo collect?
Flo’s privacy page says it processes health information such as cycle dates, symptoms and moods, as well as account information and technical or device data. It says health information is processed on the basis of consent, which users can withdraw. Flo also says it may share non-health personal data with AppsFlyer or Firebase for advertising when the user has explicitly consented, and that website cookie controls are available. These are Flo’s descriptions of its practices, not independent verification of how its systems operate. Flo’s data and privacy page
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To delete an account, Flo says users can make the request in the app. It states that identifiers are unlinked immediately after the request and that full deletion across its systems can take up to 90 days. Deletion cannot be undone. Check the current in-app instructions before proceeding. Flo’s deletion and privacy information
How does Flo Anonymous Mode work?
Flo says Anonymous Mode separates health data from direct identifiers, including a name, email address, Apple or Google account ID, payment identifiers, IP address and advertising ID. Its technical explanation says an OHTTP relay separates network identity from the health-data request. Those are company claims; the available materials do not establish that an independent party has audited the system. Flo’s Anonymous Mode product page and Flo’s technical overview
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Features that remain available
Flo says cycle tracking, symptom logging, pregnancy tracking, predictions, educational content and chatbot flows work in Anonymous Mode.
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Features and support that are lost
Flo lists Secret Chats, Flo for Partners, cross-device syncing, email notifications, family and web subscriptions, and wearable-device connections as unavailable in Anonymous Mode. It also says it cannot use identity-based support to recover, export or amend a user’s account data in this mode.
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Changing modes may be irreversible
Flo’s current pages differ in how they describe switching back: one says a new account is created and the old one deleted, while another describes Anonymous Mode as permanent and not reversible. Treat the change as potentially irreversible. Read the confirmation screens and current help materials in the app before switching; do not assume you can restore the old account.
Is Flo safe to use?
“Safe” depends on the threat a user is concerned about. Flo documents consent controls, account deletion and an identity-separation option, but its descriptions are first-party claims rather than an independent security audit. Anonymous Mode also trades away account-linked conveniences and recovery options. A careful assessment should distinguish a company’s privacy policy and product claims from regulator records and independent research.
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The FTC case page records an agency announcement dated January 28, 2021, and a final order dated June 22, 2021, concerning the app’s sharing of sensitive health data with Facebook, Google and others. The case record is the appropriate source for that regulatory timeline. FTC case page: Flo Health, Inc.
Flo’s own FAQ characterizes the settlement differently: it says the issue concerned practices from 2016 to 2019, that the FTC questioned whether its policy adequately disclosed third-party sharing, and that Flo settled to avoid litigation costs. Those are Flo’s statements about the matter, not the FTC’s findings or wording. Flo’s privacy FAQ
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to compare Flo with another period-tracking app
A fair comparison uses the same questions for every app and relies on each provider’s current policy and official feature documentation. The available material here does not establish current, like-for-like privacy details for named competitors, so it cannot support a definitive ranking.
| Comparison area | What to check in each app |
|---|---|
| Data collected | Whether it records cycle dates and symptoms, requires account identifiers, and collects technical, device or advertising-related events. |
| Consent and sharing | Whether health data or non-health identifiers are shared, with whom and for what purpose; how consent can be withdrawn or sharing disabled. |
| Identity separation | Whether the app supports anonymous or local-only use, what identifiers remain, and whether an account is required. |
| User control | Whether users can access, correct, export or delete data, how long deletion takes, and what account-recovery options remain. |
| Feature trade-offs | Whether privacy settings affect predictions, reminders, symptom logging, community, partner sharing, wearable connections or syncing. |
| Evidence quality | Whether a statement comes from a regulator, independent research, a current official policy or the company’s own product claims. |
A 2024 CHI paper examines privacy concerns among users of period-tracking apps in the post-Roe v. Wade context. It offers broader context about user concerns; it is not a current, audited privacy comparison of every app. Cao, Laabadli, Mathis, Stern and Emami-Naeini, CHI 2024 paper
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