Flo
Launched in 2015 and run from London, Flo is the most downloaded cycle app in the world, with installs counted in the hundreds of millions and tens of millions of women opening it every month. Predictions run on machine learning trained on aggregated cycle data, and the in-app articles are signed off by a medical board. Anonymous Mode, added in 2022, lets an account exist without a name or email address. Premium adds deeper reports, symptom analysis, pregnancy and postpartum modes.
Suits anyone who wants a polished free tracker, reminders that arrive on time and a community to ask awkward questions in. Worth knowing before signing up: in 2021 the FTC settled with Flo over health data shared with analytics providers, so the privacy record is trust rebuilt rather than trust never broken.
Pros
- Free version covers everyday tracking
- Anonymous Mode without name or email
- Content reviewed by doctors and researchers
- Detailed symptom and cycle reports
- Pregnancy and postpartum modes included
Cons
- Past FTC case over data shared with analytics
- Constant nudges to buy Premium
- Predictions drift on very irregular cycles
- Community feed collects folk medicine
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