How to delete your period tracker data (Apple Health, Flo, Clue, Stardust)

Short answer: on iPhone, open Health → Browse → Cycle Tracking, tap a data type such as Period, then Show All Data → Edit → Delete All — it goes from your iPhone and your iCloud. For Flo, Clue or Stardust, delete your account from inside the app before you uninstall it: removing the app alone leaves your cycle history on the company’s servers.

Below: the exact steps for the four most-installed cycle apps, the friction each one introduces, and what “deleted” actually means under their policies. Do this BEFORE you uninstall the app — once it’s gone, the in-app deletion flow goes with it, and you’ll have to go through email support.

How to delete Cycle Tracking on iPhone (Apple Health)

The easiest one. Health data is on-device + iCloud, fully under your control. To delete your cycle history:

1. Open the Health app and tap Browse.
2. Tap Cycle Tracking.
3. Scroll down and tap a data type you’ve logged — Period, a symptom, spotting, and so on.
4. Tap Show All Data, then Edit, then Delete All (or swipe left on single entries).
5. Repeat for each cycle data type you want gone.

If another period app wrote into Health, remove its data too: tap your profile picture (top right) → Apps under Privacy → the app → Delete All Data from that app, and switch its access off.

What “deleted” means here: gone from the device and from iCloud, which syncs the deletion to your other devices. Health data in iCloud is end-to-end encrypted, so there’s no readable copy on Apple’s side to delete separately.

Removing cycle data that came from your Apple Watch

Your Apple Watch doesn’t keep a separate copy: what it logs for cycle tracking is saved to Health on your iPhone, so the steps above delete it everywhere. The wrist temperature readings the watch uses for ovulation estimates sit under Browse → Body Measurements → Wrist Temperature; remove them the same way (Show All Data → Edit → Delete All).

How to delete your Flo data and account

Harder. Flo holds cycle data on its servers tied to your account. The "delete my account" flow is buried.

1. Open Flo and tap You (bottom right).
2. Tap the settings gear icon (top right).
3. Scroll to Personal Data.
4. Tap Delete my account.
5. Confirm the deletion. You'll be asked for a reason — you don't have to give one.

Dark pattern alert: Flo will offer to "pause" your account instead of delete. Pause means the data stays. Pick delete, not pause.

What "deleted" means here: Flo's privacy policy commits to deletion within 30 days of request, but does NOT commit to deletion from backup snapshots or from data already shared with third parties before deletion. Worth keeping in mind: this is the company that, in 2021, settled FTC allegations over sharing health data with third parties (it settled with no fine or admission of wrongdoing). The horse may already have bolted; closing the stable now helps but isn't a time machine.

How to delete your Clue data and account

Comparatively clean process. Clue is GDPR-bound and has to honor deletion.

1. Open Clue and tap the menu icon (top left).
2. Tap Settings → Account.
3. Tap Delete account.
4. Confirm. You'll get an email confirmation within minutes.

What "deleted" means here: Per Clue's privacy policy, your account and personal cycle data are deleted within 30 days. Aggregated, anonymized data already used in research studies (Stanford, Oxford, etc.) is not pulled back — it's already been stripped of identifiers and isn't tied to you anymore. That's a legitimate research-ethics norm and we'd call it acceptable.

How to delete your Stardust data

Less transparent. The in-app deletion exists but the surface area is small.

1. Open Stardust and tap the profile icon.
2. Tap Settings.
3. Scroll to Account → Delete account.
4. Confirm.

Dark pattern alert: If you can't find the option in-app, you may have to email [email protected] and request deletion in writing. Make the request unambiguous: "Please delete all data associated with my account, including any data shared with third parties prior to this date."

What "deleted" means here: TechCrunch reported in 2022 that Stardust shared users' phone numbers with a third-party analytics provider; Stardust revised its practices afterward and disputed parts of the coverage. As with any server-based app, data already shared with third parties may be beyond a company's control to recall — deletion stops the flow forward, not backward.

The deeper problem with cloud-stored cycle data

"Deletion" is always a one-way request to a server that may or may not honor it completely. You're trusting:

• The company to actually run the delete query.
• The company's backups to be re-run such that your data ages out.
• Every third party they shared with to also delete.
• Every analytics provider, ad network, and partner to also delete.

That's a long chain of trust. Most of it isn't enforceable from your end.

The only architecture where "delete" is guaranteed to mean "gone" is one where the data was never on a server in the first place. That's why the safest trackers are the offline-first ones: there's no other party in the chain to delete from.

After you delete

Some optional follow-up steps that close the remaining loops:

• Revoke any "Sign in with Apple" / Google grants the app had. Settings → Apple ID → Sign-in with Apple, find the app, revoke.
• Check connected services. If the period app was connected to Apple Health, the sync stops on deletion but the imported data may remain in Health. Delete it there too.
• Remove the app from your phone after the deletion confirmation email arrives — not before.
• Email-verify the deletion. Most companies send a final confirmation. Save that email — it's your evidence the request was processed.

And then, if you want a tracker where this whole process never has to happen again, see the best private period tracker apps in 2026.