Does Clue sell my data?

Clue says the health data you track is never shared with or sold to advertisers, and that its business model is selling Clue Plus subscriptions. It can share de-identified data with research partners, which you can switch off in its privacy settings.

Do I need an account to use Clue or Lunation?

Clue has asked new users to create an account since 2019, so your data is stored on its EU servers. Lunation works without an account in guest mode, and you can add Apple or Google sign-in later to keep your data.

Where is my data stored?

Clue stores data on servers in the European Union, using Amazon Web Services data centres in the EU. Lunation stores your logs in your account on Google Firebase, in the United States, as its privacy policy explains.

Is Clue a medical device?

Clue’s US App Store listing declares the app a regulated medical device: its Clue Conceive mode predicts fertile days as an aid for conception. Clue says it is not intended for contraception. Lunation is a wellness app, not a medical device.

Which is better if I am trying to conceive?

Both have a trying-to-conceive mode that shows your fertile window. Clue Conceive is declared a regulated medical-device feature; Lunation’s mode is a wellness feature based on the periods you log. If you have been trying for a while, talk to a doctor or midwife.

Lunation vs Clue: Privacy, Features and Price Compared

Lunation and Clue at a glance

Lunation and Clue compared
Feature	Lunation	Clue
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 Clue Plus; the US App Store lists $9.99 a month or $39.99 a year.
Platforms	iPhone only (iOS).	iPhone and Android.
Account required	No. Guest mode works without an account; Apple or Google sign-in can be added later from Settings.	Yes. Clue has asked new users to create an account since 2019.
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 Clue’s servers in the European Union (Amazon Web Services data centres in the EU).
Data sold or shared for ads	Never sold, never shared with advertisers and never used for ads.	Clue says tracked health data is never shared with or sold to advertisers. With your consent, de-identified data can be shared with research partners; you can switch this off.
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.	To measure its ads, Clue processes install and subscription events with your device ID and IP address, using Apple Search Ads, Google Ads and Adjust.
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: Identifiers. Linked to you: Health & Fitness, Location, Contact Info, User Content, Identifiers, Usage Data, Sensitive Info. Not linked to you: Diagnostics.
Deleting your data	Delete your account and all of its data in the app (Settings › Account › Delete Account).	Delete your account in the app, or email Clue to have all data, including data sent to third-party services, deleted within one month.
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).	EU data storage under the GDPR; opt-in research partnerships; Clue Conceive, declared on its US App Store listing as a regulated medical-device feature that predicts fertile days to aid conception; period, trying-to-conceive, pregnancy and perimenopause modes; wearable connections. Mozilla Foundation scored its privacy 8/10 in July 2026.
Best for	iPhone users who want predictions, widgets and cloud backup without having to create an account.	People who want their data stored in the EU, want to contribute to research, or use Android.

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 Clue handle your health data?

Clue is made in Berlin by BioWink GmbH and stores data on servers in the European Union, under the GDPR. Its privacy policy says tracked health data is never shared with or sold to advertisers. With your consent, Clue shares de-identified health data with selected research partners, and you can switch that off at any time. Lunation stores your logs in your account on Google Firebase, in the United States. It never sells them, never shares them with advertisers and never uses them for ads.

Both apps measure their own advertising. Clue processes install and subscription events with your device ID and IP address, through Apple Search Ads, Google Ads and Adjust. Lunation sends install, trial and purchase events, with no health data, and shows Apple’s tracking prompt; the advertising identifier is used only if you allow it. On the App Store, Clue lists Identifiers as data “used to track you”; Lunation lists Purchases, Identifiers and Usage Data.

The Mozilla Foundation tested Clue in July 2026 and scored its privacy 8 out of 10. Its reviewers did not see symptoms, cycle data or other reproductive-health details reaching Clue’s third-party partners during normal use, and noted that Clue asks separately about research, analytics and advertising and lets you change those choices later.

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.

Where Clue is stronger

Platforms. Clue works on Android as well as iPhone. Lunation is iPhone only.
EU data storage. Clue keeps data on EU servers under European privacy law.
Research. You can choose to contribute de-identified data to menstrual and reproductive health studies.
A regulated conception feature. Clue Conceive is declared on Clue’s US App Store listing as a regulated medical-device feature that predicts fertile days to aid conception.
More modes and connections. Perimenopause mode and data from wearables, alongside period, trying-to-conceive and pregnancy modes.
Scale. Clue’s US App Store rating is 4.8 from about 408,000 ratings. Lunation is a small app with 106 ratings.

Where Lunation is different

No account needed. Guest mode works without any sign-in; 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 the app. Deleting your account in Settings removes all of its data.
Who makes it. Holdone Software SRL, a small independent company in Romania.

Which should you choose?

Choose Clue if…

you use Android, or switch between phones;
you want your data stored in the European Union;
you would like to contribute to reproductive health research;
you want a conception feature that is regulated as a medical device, or a perimenopause mode.

Choose Lunation if…

you use an iPhone and want to start without creating an account;
you want predictions, widgets and pregnancy mode in a simple app;
you want your health data never shared with advertisers;
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.