Source-backed analysis7
Review basis
Research-based review: the AppDuo Editorial Team compiled it from official pages, documentation, app stores, press and user feedback, without hands-on testing. Every claim links to a source with the date it was checked.
7 reference sourcesInformation updated Nov 10, 2026
How we review
Flo Review
Widely used cycle tracker: free basics, many features behind Premium
By AppDuo Editorial Team · Updated
- iOS
- Android
On this page
Decide at a glance
Our verdict
Flo suits people who want a period, ovulation and pregnancy tracker with a large content library and very high App Store ratings. The caveats are a documented privacy history that led to an FTC order and the number of features behind Premium.
Best for: People who want cycle, ovulation and pregnancy tracking in a single app
Skip it if: Those highly sensitive about privacy who do not want health data on a service with a regulatory enforcement history
Pros
- Very high App Store ratings: 4.7/5 (over 2 million, US) and 4.8/5 (Vietnam)
- Offers Anonymous Mode, and the company open-sourced the technology in 2023
- Broad scope: cycle, conception, pregnancy, perimenopause and partner sharing
Cons
- Subject to an FTC order over sharing health data with third parties, plus related class-action litigation
- Many features sit in Premium; Flo has publicly replied to reviewers that some features were moved out of the free plan
All pros and cons · Who is it for?
Cons
- No Premium price on the official site, and the App Store shows many different price points
Best for
- People who want the Anonymous Mode option to reduce identity linkage to health data
Problems it solves
Experience & key features
What Flo is
Flo is an app for tracking menstrual cycles, ovulation, pregnancy and perimenopause symptoms. The App Store listing dates to October 2015 and is published by FLO HEALTH UK LIMITED. Its description claims over 570 million downloads worldwide as of July 2026, a figure published by Flo itself.
Features
Per the App Store description, users can log over 70 symptoms and moods, receive cycle and ovulation predictions, log LH test and basal temperature results, and download cycle reports to share with a doctor. Pregnancy mode offers weekly updates and the perimenopause section includes a Perimenopause Score. Flo for Partners lets users invite a partner. Flo stresses that the app is informational and not a method of birth control or conception aid.
Pricing and privacy
The app is free to download; Premium adds daily insights, expert videos, a 24/7 Health Assistant, Secret Chats and Flori. Flo publishes no price on its official site; the US App Store shows several "Flo Premium" items from $1.99 to $59.99 without a stated billing period. On privacy, the FTC issued an order in 2021 after alleging health data was shared with third parties, and in 2025 the Frasco class action led to a verdict against Meta and settlements by Flo, Google and Flurry.
More analysis
Who it is for
Flo suits people wanting an all-round app from cycle tracking to pregnancy who accept paying to unlock more. Privacy-first users should review the settings, consider Anonymous Mode, or compare apps such as Clue or Natural Cycles.
Screenshots
Plans & pricing
Prices last verified Nov 10, 2026
Free
PersonalFree
Free to download with core cycle-tracking tools, per the App Store description.
Premium
PersonalContact sales
Paid tier covering tailored daily insights, expert-led videos, in-depth pregnancy features, fertility insights, the Symptom Checker, a 24/7 Health Assistant, Secret Chats and Flori (Well-Being Battery). The Symptom Checker is unavailable in the UK, EU, Iceland, Liechtenstein, Norway and Switzerland. Flo's official pages list no price. On the US App Store, in-app items named "Flo Premium" range from $1.99 to $59.99 without a stated billing period; prices may vary by region.
- Free plan limits
- The free version includes core cycle-tracking tools. A Flo reply in App Store reviews acknowledges that some features were moved out of the free plan.
- Free trial
- No free trial
Cancellation & refunds
The App Store page marks Flo's subscription items as offering a free trial; no refund terms were found on the pages read. App Store purchases are handled by Apple.
Privacy
Flo handles highly sensitive data (cycles, pregnancy, symptoms). The App Store privacy section, self-declared by the developer, lists health and fitness data as linked to you and used for analytics, personalisation and app functionality; purchase history, coarse location, identifiers and usage data are used to track you, and the developer's own advertising or marketing uses purchase history, coarse location, email and identifiers. In 2021 the US FTC alleged Flo shared health data from millions of users with analytics and marketing firms including Facebook and Google despite promising privacy; the final order of 22 June 2021 requires affirmative consent before sharing and an independent privacy review. In August 2025 a federal jury found Meta violated California's CIPA in Frasco v. Flo Health; Flo ($8M), Google ($48M) and Flurry ($3.5M) agreed to settle while denying wrongdoing. Flo offers an Anonymous Mode that avoids linking personal identifiers to health data and says it holds two international security certifications.
Flo alternatives
Frequently asked questions
Is Flo free?
Downloading and the core tools are free. Premium is a paid tier; prices are shown in the app and may vary by region.
Has Flo faced action over privacy?
The FTC finalised an order on 22 June 2021 after alleging Flo shared health data with Facebook, Google and others. In 2025 Flo agreed to an $8M class-action settlement without admitting wrongdoing.
What is Anonymous Mode?
According to Flo, it lets you use the app without personal identifiers linked to your health data. Launched in 2022, with the technology open-sourced in June 2023.
Can Flo be used as birth control?
No. Flo states the app is not a method of birth control or conception aid, and predictions are informational only.
Review evidence & sources7
Scores
- Ease of use
- 8.0
- Features
- 8.0
- Value for money
- 6.5
- Performance
- 7.5
- Support
- 6.5
- Privacy & security
- 5.0
Why this score
A 4.7/5 rating from over 2 million US ratings and 4.8/5 in Vietnam indicates broad approval of the experience. The score rests on public ratings, not direct measurement.
Why this score
Per the App Store description: over 70 trackable symptoms and moods, ovulation predictions, pregnancy and perimenopause tools, downloadable cycle reports for doctors, and Flo for Partners. A good share sits in Premium.
Why this score
The free tier has the core tools, but Flo acknowledges moving some features to Premium, and Flo lists no official price while the App Store shows items from $1.99 to $59.99, making comparison with peers hard.
Why this score
Updated regularly (v10.10.0 on 5 Nov 2026) with high ratings. No independent data on prediction accuracy was reviewed, and Flo states predictions are informational and not a birth-control method.
Why this score
Flo replies to App Store reviews and points users to email support. No verified information was found on other support channels.
Why this score
The FTC alleged Flo shared health data with Facebook and Google despite privacy promises; class litigation led to an $8M Flo settlement and an adverse Meta verdict. Anonymous Mode and self-reported certifications help, but the App Store declaration still lists purchase history, location and identifiers used to track users.
What users say
- App Store (United States)4.7/5 · 2,018,928
- App Store (Vietnam)4.8/5 · 297,974
Sources
- storeApp Store listing (US)Nov 10, 2026
- storeApp Store listing (Vietnam, via iTunes lookup)Nov 10, 2026
- Vendor-providedFlo newsroom: Anonymous Mode open-sourcedNov 10, 2026
- Vendor-providedFlo newsroom: Series C fundingNov 10, 2026
- Vendor-providedFTC press release (2021-06-22)Nov 10, 2026
- pressTech.eu: Flo raises over $200M (2024-07-30)Nov 10, 2026
- pressClaims Journal: Flo, Google, Flurry settlements (2025-09-26)Nov 10, 2026
Specs & compatibility
- Developer
- Flo Health
- Headquarters
- United Kingdom
- Launched
- 2015
- Category
- Health
Capabilities
- Mobile app
- AI features
Platforms
- iOS
- Android
Interface languages
- Vietnamese
- English
- Japanese
- Chinese
- Spanish
- French
- Korean
- German
- Portuguese
- Russian
- Thai
- Indonesian
Integrations
- Apple Watch
Support
Change history
- Company.Frasco settlement terms disclosed: Google $48M, Flo $8M, Flurry $3.5M. A jury had found Meta liable on 4 August 2025.
- Company.Flo raised over $200M in a Series C with General Atlantic at a valuation above $1 billion, citing nearly 70 million monthly active users as of June 2024.
- Feature.Flo open-sourced the technology behind Anonymous Mode, launched in 2022.
Full change history (5)
- Company.The FTC finalised its order against Flo Health over sharing health data with Facebook, Google and others contrary to privacy promises.
- Launch.First App Store release date of the Flo app per iTunes data.
About the author
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