Guides

Which period tracker apps don't sell your data?

By the Plum team · Updated October 12, 2026
This page is general information, not medical advice. For questions about your own cycle or health, talk to a doctor, nurse, or other clinician who knows you.

The quick answer

Almost every big period app now says it doesn’t sell your data, so that promise alone won’t separate them. The stronger answer is an app that has nothing to sell. Euki and drip keep everything on your phone, and Apple’s Cycle Tracking does too, with an encrypted backup. If you want your history synced to an account, pick Plum. It never sells your data and has nothing under Data Used to Track You on its App Store label. Clue, Flo and Stardust also say they don’t sell data, and each one lists something under tracking.

Three different promises

Not selling means the company won’t hand your data to someone else for money. It’s a line in a privacy policy, and it’s the weakest of the three.

Not tracking is about advertising. Apple makes every developer declare, on the App Store listing, which data may be linked with other companies’ apps and websites. That section is called Data Used to Track You. An empty section, or a label that reads Data Not Collected, is the developer’s own statement on the record.

Staying on the phone is the strongest. If your data never reaches a server, nobody there can sell it, leak it or be asked for it. The price is that you lose the backup, and usually any way to share.

How we chose

We make Plum, and there are no affiliate links on this page. On October 12, 2026 we read each company’s privacy policy or privacy page and each app’s US App Store listing. We quote what they say and link them all below. We didn’t rank apps on promises we can’t check, and we left out prices.

Euki, for collecting nothing at all

Euki is an open-source app run by a US nonprofit. Its privacy FAQ says it doesn’t collect or store anything you track, has no accounts and no cloud servers, and doesn’t store, share or sell your data. Its label reads Data Not Collected. A lost phone means lost history, and it has no sharing.

drip, for code you can read yourself

drip is a volunteer project from Heart of Code e.V. in Berlin. Its privacy policy says it collects no usage data or personal information, has no ads and no tracking, and stores your cycle data only on your device. It also warns that your phone’s own cloud backup may copy that data unless you switch it off. Its label reads Data Not Collected, and its source code is public.

Apple Cycle Tracking, for an encrypted backup

Cycle Tracking is part of the Health app on iPhone. Apple’s privacy page says Health data is encrypted when the phone is locked, and that with two-factor authentication on, the iCloud backup is made in a way Apple can’t read. It’s the on-device option that still survives a lost phone.

Plum, for a synced tracker with nothing under tracking

Plum is our iPhone app. It has no ads, never sells your data and never uses it for advertising. It never shows the iPhone prompt asking to track you, so its App Store label has nothing under Data Used to Track You. Analytics get screens and taps under an account ID. They get health data only if you tick an optional box, which starts unticked. AppsFlyer measures installs without your advertising ID.

Here’s the trade-off. You sign in with Apple or Google, and your history is stored encrypted on Plum’s servers with a copy on the phone. That’s what lets a new phone pick up where you left off, and lets friends in a private group see each other’s period days while symptoms and moods stay private. It also means Plum isn’t on-device only, the way Euki, drip and Apple are. You can delete your account and data in the app. Plum and your data names every service involved.

Clue, for EU storage and a no-sale pledge

Clue’s home page says it has never sold your health data and never will. Its privacy policy says all data sits on servers in the EU and that tracked health data is never shared with or sold to advertisers. It also says Clue uses Adjust, with your advertising identifier, to measure its ads, and that Adjust can’t see your health data. Its label lists Identifiers under tracking.

Flo, for the biggest app with an anonymous option

Flo’s privacy policy says it will never sell your data. It also describes sharing technical identifiers with AppsFlyer and Firebase, with your consent, to measure its ads, and says health data isn’t part of that. Its label lists Purchases, Location, Identifiers and Usage Data under tracking. Flo’s Anonymous Mode stops your name, email and IP address from being linked to your health data. Flo says it can’t be undone and turns off cross-device sync.

Stardust, for a no-sale pledge with friend sharing

Stardust’s data page says it doesn’t sell data, never has and never will. It says your health data is encrypted and tied only to a random account ID. Its label lists Purchases, Identifiers and Usage Data under tracking.

Side by side

Labels read off each app’s US App Store listing on October 12, 2026.
What it says about sellingData Used to Track YouWhere your data lives
PlumNever sells data or uses it for adsNothing. The section is emptyPlum’s servers, encrypted, with a copy on the phone
EukiCollects nothing to sellNothing. The label is Data Not CollectedOn the phone only
dripCollects nothing to sellNothing. The label is Data Not CollectedOn the phone only
ClueNever sells health dataIdentifiersServers in the EU
FloNever sells your dataPurchases, Location, Identifiers, Usage DataFlo’s servers, with Anonymous Mode as an option
StardustDoes not sell dataPurchases, Identifiers, Usage DataStardust’s servers, under a random account ID
Apple Cycle TrackingNot stated on the pages we readBuilt in, no listingOn the phone, with an end-to-end encrypted iCloud backup

What to look for

  • Open the App Store listing and read Data Used to Track You before you install. It takes ten seconds.
  • Search the privacy policy for “sell” and “advertis”. A good one says health data is never sold or shared with advertisers, in those words.
  • Decide whether you need a backup. If you don’t, an on-device app is the safest choice.
  • Make sure you can delete your account from inside the app. Deleting the app alone doesn’t do it.

Our guide to choosing a private period tracker walks through a privacy policy line by line.

Sources

Common questions

Which period tracker apps don't sell your data?

Euki and drip can't sell your data, because they keep everything on your phone and collect nothing. Apple's Cycle Tracking keeps data on the phone and can back it up with end-to-end encryption. Plum stores your data on its servers and says it never sells it or uses it for advertising, and its App Store label lists nothing under Data Used to Track You. Clue, Flo and Stardust also say they don't sell data, but each lists something under tracking. We make Plum, and we read every source on October 12, 2026.

Does Flo sell your data?

Flo's privacy policy, effective August 31, 2026, says it will never sell your data and does not sell or rent personal data for money. In 2021 the FTC settled with Flo Health over allegations that it shared health details with analytics and marketing services after promising privacy. Today Flo's App Store label lists Purchases, Location, Identifiers and Usage Data under Data Used to Track You. Its Anonymous Mode stops your name, email and IP address from being linked to your health data.

Does Clue sell your data?

Clue says no. Its home page says it has never sold your health data and never will, and its privacy policy says the health data you track is never shared with or sold to advertisers. Its data is stored on servers in the EU. Clue's App Store label does list Identifiers under Data Used to Track You, and its privacy policy says it uses your advertising identifier through Adjust to measure its ads.

What's the difference between not selling data and not tracking you?

Selling means handing your data to someone else for money. Tracking, in Apple's sense, means linking data from an app with data from other companies' apps and websites, usually for advertising. An app can promise never to sell and still track. Apple makes every developer declare tracking on the App Store listing under Data Used to Track You, so that section is the quickest check. A third question is whether your data leaves the phone at all.

Which period tracker keeps my data only on my phone?

Euki and drip store everything on the device. Neither has an account or a server, and both App Store labels read Data Not Collected. drip's privacy policy notes that your phone's own cloud backup may still copy the app's data unless you turn that off. Apple's Cycle Tracking also keeps data on the phone, and its iCloud backup is end-to-end encrypted when two-factor authentication is on. Plum, Clue, Flo and Stardust all store data on their own servers.

Is Plum private?

Plum has no ads, never sells your data and never uses it for advertising. It never asks to track you, so its App Store label lists nothing under Data Used to Track You. Your history is stored encrypted on Plum's servers with a copy on your phone, so it isn't on-device only. Analytics see screens and taps under an account ID, and get health data only if you tick an optional box that starts unticked. You can delete your account and data in the app.

Track it with PlumA period tracker for iPhone with no ads.

Plum logs your period in two taps and predicts your next period, fertile window and ovulation. We never sell your data.

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