Does Flo sell my health data?

Flo’s privacy policy says it never sells personal data and does not share health data with third parties for marketing. With your consent, it shares technical identifiers with advertising and analytics partners such as AppsFlyer, Firebase and TikTok Ad Manager to measure its own ads.

What did the FTC say about Flo?

In January 2021 the US Federal Trade Commission announced a settlement with Flo Health over allegations that it had shared users’ health information, such as whether they were pregnant, with marketing and analytics companies including Facebook and Google after promising to keep it private. The settlement required Flo to get users’ consent before sharing health information and to obtain an independent review of its privacy practices.

Can I use Lunation without an account, like Flo’s Anonymous Mode?

Yes. Lunation’s guest mode needs no email or sign-in, and you can add Apple or Google sign-in later from Settings. Your logs are still stored in the cloud under an anonymous ID so they can sync, which is different from apps that keep everything only on your phone.

Is Lunation available on Android?

No. Lunation is iPhone only. Flo has apps for iPhone, Apple Watch and Android.

Can I use Flo or Lunation as birth control?

No. Flo’s App Store listing says it is not a method of birth control, and Lunation is not a contraceptive either. Natural Cycles is the app the US FDA has authorised for contraception.

Lunation vs Flo: Privacy, Features and Price Compared

Lunation and Flo at a glance

Lunation and Flo compared
Feature	Lunation	Flo
Price model	Free. Optional Lunation Plus subscription, monthly or yearly; the yearly plan has a free trial for eligible new subscribers. See the App Store for current prices.	Free to download. Optional Flo Premium subscription; the US App Store lists in-app purchases from $1.99 to $59.99.
Platforms	iPhone only (iOS).	iPhone, Apple Watch and Android.
Account required	No. Guest mode works without an account; Apple or Google sign-in can be added later from Settings.	Anonymous Mode lets you use Flo without linking your name, email address or technical identifiers to your data; some features are not available in it.
Where your data is stored	In your account on Google Firebase, so it can sync and be restored. In guest mode it is stored the same way under an anonymous ID.	On Flo’s servers, in your Flo profile.
Data sold or shared for ads	Never sold, never shared with advertisers and never used for ads.	Flo says it never sells personal data, does not share health data with third parties for marketing, and does not use Apple Health data for advertising.
Ads and ad measurement	No ads in the app. It measures which of its own ads brought you in (install, trial and purchase events, no health data) and shows Apple’s tracking prompt; the advertising identifier is used only if you allow it.	With your consent, Flo shares technical identifiers (and your advertising ID if you allow tracking) with AppsFlyer, Firebase and TikTok Ad Manager to measure and improve its ads; it says health data is not included.
Apple privacy label	Used to track you: Purchases, Identifiers, Usage Data. Linked to you: Health & Fitness, Purchases, Contact Info, User Content, Identifiers, Usage Data, Sensitive Info. Not linked to you: Purchases, Diagnostics.	Used to track you: Purchases, Location, Identifiers, Usage Data. Linked to you: Health & Fitness, Purchases, Location, Contact Info, User Content, Search History, Identifiers, Usage Data, Sensitive Info, Diagnostics.
Deleting your data	Delete your account and all of its data in the app (Settings › Account › Delete Account).	Request deletion in the app’s settings or by email; Flo says full erasure from its backups can take up to 90 days.
Standout features	Predicts your next period and fertile window from the periods you log; trying-to-conceive and pregnancy modes; Lock Screen and Home Screen widgets; optional Apple Health sync; a daily AI-written briefing, labelled as AI-generated (Plus).	A large feature set: more than 70 symptoms and moods, articles and expert-led videos, an AI health assistant, partner sharing, pregnancy and perimenopause tools, and an Apple Watch app. Mozilla Foundation scored its privacy 7/10 in July 2026.
Best for	iPhone users who want predictions, widgets and cloud backup without having to create an account.	People who want a wide range of content and features, or who use Android or switch between platforms.

Prices and privacy labels are from the US App Store. Apple’s labels are written by each developer and not verified by Apple.

How do Lunation and Flo handle your health data?

Both apps keep your logs on their own servers so they can sync and restore them. Lunation stores them in your account on Google Firebase. It never sells them, never shares them with advertisers and never uses them for ads. Flo’s privacy policy says it never sells personal data, does not share health data with third parties for marketing, and does not use Apple Health data for advertising.

Both apps also measure their own advertising. Lunation sends install, trial and purchase events, with no health data, so it can tell which ads brought someone in, and shows Apple’s tracking prompt; the advertising identifier is used only if you tap Allow. Flo, with your consent, shares technical identifiers with AppsFlyer, Firebase and TikTok Ad Manager for the same purpose, and its policy says it may use Apple’s tracking prompt too. That is why both App Store labels list data “used to track you”: Purchases, Identifiers and Usage Data for Lunation, and Purchases, Location, Identifiers and Usage Data for Flo.

The Mozilla Foundation tested Flo’s network traffic in July 2026 and scored its privacy 7 out of 10. Its reviewers did not see health data, such as symptom logs or pregnancy information, sent to Flo’s analytics or marketing partners, and found that Anonymous Mode stopped the requests to AppsFlyer for the rest of the session.

Lunation’s daily briefing (Plus) is written by AI and labelled as AI-generated. The Lunation privacy policy lists every service that receives data and exactly what each one gets.

What is Flo’s privacy history?

In January 2021 the US Federal Trade Commission announced a settlement with Flo Health. The FTC alleged that Flo had promised to keep users’ health data private but disclosed health information, such as whether a user was pregnant, to companies providing marketing and analytics services, including Facebook’s and Google’s analytics divisions, until a news report revealed it in February 2019. The settlement required Flo to get users’ consent before sharing their health information, to obtain an independent review of its privacy practices, and to instruct the companies that received the data to destroy it.

In August 2025 a federal jury in California found Meta liable under the California Invasion of Privacy Act inFrasco v. Flo Health, a class action over data collected from Flo users. Flo, Google and Flurry settled with the plaintiffs before the verdict, and the jury made no finding against Flo. Meta said it disagreed with the verdict and was exploring its legal options.

Where Flo is stronger

Platforms. Flo works on Android and has an Apple Watch app. Lunation is iPhone only.
Content and features. Flo offers more than 70 symptoms and moods to log, articles and expert-led videos, an AI health assistant, partner sharing and perimenopause tools.
Scale. Flo’s US App Store rating is 4.7 from about 2 million ratings, and Mozilla describes it as having 81 million monthly users. Lunation is a small app with 106 ratings.
Anonymous Mode. Flo can unlink your name, email address and technical identifiers from your health data.

Where Lunation is different

No account needed. Guest mode works without any sign-in, and you can add Apple or Google sign-in later.
A short list of what it does. Period and fertile window predictions from the periods you log, trying-to-conceive and pregnancy modes, Lock Screen and Home Screen widgets, and optional Apple Health sync.
No ads in the app, and health data never goes to advertisers.
Deletion in one place. You can delete your account and all of its data from Settings.
Who makes it. Holdone Software SRL, a small independent company in Romania.

Which should you choose?

Choose Flo if…

you use Android, or want an Apple Watch app;
you want a large library of articles, videos and an AI assistant;
you want to share your cycle with a partner;
you are tracking perimenopause.

Choose Lunation if…

you use an iPhone and want to start without creating an account;
you want predictions and widgets without a lot of extra content;
you want your health data never shared with advertisers, and account deletion inside the app;
you prefer an app from a small independent company.

Medical disclaimer. Lunation is made by Holdone Software SRL, which also publishes this page. Facts about other apps come from their own privacy policies and app store listings, regulators, courts and independent reviewers, listed under Sources, and were checked on the date shown. Apps change often, so check the current listing before you decide. Flo, Clue and the other names here are trademarks of their owners, who have not reviewed or endorsed this page. None of these apps replaces advice from a doctor or midwife, and Lunation is not a method of contraception.

Lunation vs Flo