islaIsla and Apple Health compared
How Isla and Apple Health differ on sign-up, what is shared, what is free and what it costs, from each App Store page and help center as read on 2026-10-04. Isla reads from and writes to Apple Health, so you can keep using both.
| Isla | Apple Health | |
|---|---|---|
| Sign-up before use | none | none |
| Data used to track you, per the App Store label | none | built into iOS, no label |
| Ads or upgrade pop-ups | none | none |
| Notes on any day | free | no |
| Home and Lock Screen cycle widgets | free | no |
| Perimenopause mode | Pro | no |
| Import from Flo or Clue | Pro | no |
| Copy of your data from inside the app | JSON or CSV, free | all-data XML archive |
| Cycle report PDF for a doctor | Pro, any dates | not verified |
| Price | $9.99 once, $5.99 a year or $1.49 a month | free |
"Not found" means we did not find it in the App Store listing or help center; it may exist. Prices are US amounts. Corrections: isla@tundra.industries.
What Apple Health has that Isla 1.0 does not
- It is built into every iPhone and free
- Retrospective ovulation estimates from Apple Watch wrist temperature, on supported watches
- Notifications about possible cycle deviations, such as irregular or prolonged cycles
- Sharing Cycle Tracking with a contact through Health Sharing
Moving your history
Nothing to move: in Isla, Settings, Your log, Bring your history, Apple Health reads the Cycle Tracking history already on your iPhone, for free. Turn on Health sync and Isla keeps writing what you log back to Health.
Isla estimates your cycle from what you log. It is not birth control and it is not medical advice.
Isla is free for logging, estimates, reminders, widgets and Apple Health sync. Isla Pro is $9.99 once, $5.99 a year or $1.49 a month in the US.
Get Isla on the App Store