islaIsla and Clue compared
How Isla and Clue 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 | Clue | |
|---|---|---|
| Sign-up before use | none | account required |
| Data used to track you, per the App Store label | none | identifiers |
| Ads or upgrade pop-ups | none | upgrade pop-ups |
| Notes on any day | free | free |
| Home and Lock Screen cycle widgets | free | free |
| Perimenopause mode | Pro | Pro |
| Import from Flo or Clue | Pro | no |
| Copy of your data from inside the app | JSON or CSV, free | JSON zip by email |
| Cycle report PDF for a doctor | Pro, any dates | separate purchase |
| Price | $9.99 once, $5.99 a year or $1.49 a month | $29.99 to $39.99 a year |
"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 Clue has that Isla 1.0 does not
- More than 400 articles, with full access in Clue Plus
- Clue Connect partner sharing, in Clue Plus
- Data from wearables such as Oura and WHOOP, in Clue Plus
- Dark mode and low-key app icons
Moving your history
In Clue, Settings, Download my data. Clue emails a password-protected zip; open it in Files with that password and keep the JSON file. In Isla (Isla Pro), Settings, Your log, Bring your history, then pick the file.
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