Compare
By data model, not by features.
The interesting difference in this category is not the colour of the ring. It is where the record lives, and who is paid to keep it.
Flo and Clue are named because they are the apps people actually switch from. The last column is the shape of a typical free tracker, not a specific product. Nothing here is a medical claim, and nothing here is about whose prediction is “better”.
Last checked 14 August 2026. Public product facts, not a live scrape.
Account required
- iWoman
- No
- Flo
- Yes Sign-in to use the app
- Clue
- Yes Sign-in to use the app
- Typical free tracker
- Usually yes
Where the cycle lives
- iWoman
- On the phone only
- Flo
- Cloud account
- Clue
- Cloud account
- Typical free tracker
- Vendor servers
Advertising in the app
- iWoman
- None
- Flo
- None in the paid tier
- Clue
- None in the paid tier
- Typical free tracker
- Often yes, if free
How they are paid
- iWoman
- Once, up front
- Flo
- Subscription
- Clue
- Subscription
- Typical free tracker
- Ads, subscription, or both
App Store privacy label
- iWoman
- Data Not Collected
- Flo
- Data Used to Track You / Linked
- Clue
- Data Linked to You
- Typical free tracker
- Usually “Linked” or “Tracked”
Export without an account
- iWoman
- Yes, on the device
- Flo
- Through the account
- Clue
- Through the account
- Typical free tracker
- Rarely
| Topic | iWoman | Flo | Clue | Typical free tracker |
|---|---|---|---|---|
| Account required | No | Yes Sign-in to use the app | Yes Sign-in to use the app | Usually yes |
| Where the cycle lives | On the phone only | Cloud account | Cloud account | Vendor servers |
| Advertising in the app | None | None in the paid tier | None in the paid tier | Often yes, if free |
| How they are paid | Once, up front | Subscription | Subscription | Ads, subscription, or both |
| App Store privacy label | Data Not Collected | Data Used to Track You / Linked | Data Linked to You | Usually “Linked” or “Tracked” |
| Export without an account | Yes, on the device | Through the account | Through the account | Rarely |
If a cell is wrong, write and it will be corrected with a new date. We would rather be dated and specific than current and vague.