Clue vs Flo: how do they compare?
Clue and Flo are both listed on HerFound, and both carry facts sourced from their own pages. Same for both: there is a free version. Clue: says it does not sell personal data; Flo: says it does not sell personal data for money. Clue: you need an account to use it; Flo: creating an account is optional. Last checked Nov 11, 2026.
Updated . We don't pick a winner or publish ratings. This sets out what each company says, side by side.
Side by side
 Clue |  Flo | |
|---|---|---|
| What it is | A period tracker: cycle tracking with predictions for your period, PMS and ovulation. | A period and ovulation tracker: predictions plus personalized health insights. |
| Price model | Freemium | Freemium |
| Platforms | iOS, Android | iOS, Android |
| Free version | There is a free version. | There is a free version. |
| Paid plan | $9.99/month or $39.99/year | $1.99 to $59.99 |
| Selling personal data | Says it does not sell personal data. | Says it does not sell personal data for money. |
| Advertising | Says some data is used or shared for advertising. | Says some data is used or shared for advertising. |
| Account | You need an account to use it. | Creating an account is optional. |
| Where your data is kept | Your data is stored on the company's servers. | Offers an anonymous mode: data is stored on its servers without your name or email. |
| Deleting your data | You can delete your data or account from inside the app. | You can delete your data or account from inside the app. |
| Company based in | Germany | United Kingdom |
| Apple Watch | — | Has an Apple Watch app. |
Sources: each app's own privacy policy, help pages and US App Store listing. Open either app to read the exact passage behind each line and the date we checked it. “—” means we have not sourced that fact yet. This is what each company states, not an audit of what it does.
What Clue does
Everyone with a cycle, Clue says, across life stages from a first period to perimenopause.
- 🩸 Period and cycle tracking with period, PMS and ovulation predictions
- 📝 Log symptoms, mood and other cycle experiences
- 🔄 Track your cycle even without menstrual bleeding
- 🌱 Clue Conceive mode with fertile window predictions (Clue Plus)
- 🤰 Pregnancy and perimenopause modes (Clue Plus)
- 💞 Clue Connect to share your cycle with another person (Clue Plus)
- ⌚ Connect a wearable for temperature and sleep data (Clue Plus)
What Flo does
People tracking their periods, ovulation, pregnancy and perimenopause; Flo describes itself as a women's health app.
- 🩸 Period and cycle tracking that predicts your next period
- 🌱 Ovulation and fertile-day tracking for when you're trying to conceive
- 🤰 Week-by-week pregnancy tracking
- 🌙 Perimenopause symptom information and support
- 💞 Flo for Partners: share your cycle information with a partner (Premium)
- 🕶️ Anonymous Mode: no name or email linked to your health data
- 🤖 Premium extras: a health assistant chatbot and personalised health reports
Clue vs Flo: common questions
Clue: there is a free version. Flo: there is a free version.
Clue's paid plan is listed at $9.99/month or $39.99/year. Flo's is listed at $1.99 to $59.99. Prices change and differ by country; each listing shows where and when we read them.
Clue says it does not sell personal data. Flo says it does not sell personal data for money. This is what each company states in its own policy, not an audit.
Clue: you need an account to use it. Flo: creating an account is optional.
Clue: your data is stored on the company's servers. Flo: offers an anonymous mode: data is stored on its servers without your name or email.