Period tracker privacy guides
Plain explanations of what a cycle app can collect and the iPhone settings that keep your data with you.
What a period tracker app can see about you
The data a period tracking app can collect: what you type, what the phone adds, account details and outside code in the app, and how to check each one on an iPhone.
How to keep your cycle data on your iPhone
Practical steps to keep period and cycle data on your own iPhone: choosing an app, checking it, Apple Health, backups and keeping your own copy.
How to read an App Store privacy label for a period tracker
What each section of an App Store privacy label means (tracking, linked, not linked, not collected), where it falls short, and what to look for in a period app.
How to export and delete your period tracker data
How to get a copy of your cycle history out of Flo, Clue, Apple Health and Isla, and what deleting the app does and does not erase.
Keeping a period tracker private on a shared or borrowed phone
iPhone settings that keep a period app out of sight: locking and hiding apps, notification previews, widgets, Siri suggestions and discreet app options.
Isla has no account and no server for your log. The App Store label reads "Data Not Linked to You: Usage Data (Product Interaction)", and a page inside the app lists the few anonymous events that leave the phone.
Get Isla on the App Store