Flo vs Natural Cycles: how do they compare?
Flo and Natural Cycles are both listed on HerFound, and both carry facts sourced from their own pages. Flo: there is a free version; Natural Cycles: there is no free version. On selling data, the same for both: says it does not sell personal data for money. 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
 Flo |  Natural Cycles | |
|---|---|---|
| What it is | A period and ovulation tracker: predictions plus personalized health insights. | A hormone-free birth control app: FDA-cleared and based on your body temperature. |
| Price model | Freemium | Subscription |
| Platforms | iOS, Android | iOS, Android |
| Free version | There is a free version. | There is no free version. |
| Paid plan | $1.99 to $59.99 | $21.99/month or $149.00/year |
| Selling personal data | Says it does not sell personal data for money. | 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 | Creating an account is optional. | — |
| Where your data is kept | Offers an anonymous mode: data is stored on its servers without your name or email. | Your data is stored on the company's servers. |
| Deleting your data | You can delete your data or account from inside the app. | You can ask the company to delete your data. |
| Company based in | United Kingdom | — |
| Apple Watch | Has an Apple Watch app. | 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 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
What Natural Cycles does
Adults over 18 who want hormone-free birth control, or support with planning a pregnancy, pregnancy, postpartum and perimenopause.
- 🌡️ NC° Birth Control: a daily fertility status from your temperature and cycle data
- 🌱 NC° Plan Pregnancy: identifies your most fertile days
- 🤍 Modes for following a pregnancy, postpartum and perimenopause
- ⌚ Overnight temperature from the NC° Band or compatible wearables like Oura Ring and Apple Watch
- 📝 Log symptoms, mood and energy
- 💞 A partner view of your cycle phase and fertility status
- 📚 Cycle insights and an education library
Flo vs Natural Cycles: common questions
Flo: there is a free version. Natural Cycles: there is no free version.
Flo's paid plan is listed at $1.99 to $59.99. Natural Cycles's is listed at $21.99/month or $149.00/year. Prices change and differ by country; each listing shows where and when we read them.
Flo says it does not sell personal data for money. Natural Cycles says it does not sell personal data for money. This is what each company states in its own policy, not an audit.
Flo: offers an anonymous mode: data is stored on its servers without your name or email. Natural Cycles: your data is stored on the company's servers.