Few mainstream apps hold data as sensitive as a period tracker, and Flo is the biggest of them all. Built by Flo Health, it tracks menstrual cycles, ovulation, symptoms, and pregnancy, wrapping the logging in a polished interface with a large library of medically reviewed articles. More than a hundred million Android installs make it the category leader by a wide margin.
That popularity comes with history. In 2021 Flo settled with the US Federal Trade Commission over allegations that it had shared users' health details with outside analytics firms despite promising to keep them private. Since then, and especially after the Dobbs decision made cycle data a potential legal liability in parts of the United States, the company has added an Anonymous Mode that decouples your data from your identity. The app is excellent; whether to trust it deserves real thought.
Everyday cycle awareness
Logging periods and symptoms takes seconds, and predictions for the next cycle improve as history accumulates. For people who mainly want to know when their period is due and spot irregular patterns worth mentioning to a doctor, the free tier covers it.
Trying to conceive
A dedicated mode shifts the app's focus to ovulation estimates, fertile windows, and conception-related content. The predictions are statistical, not diagnostic, so treat them as a planning aid rather than a substitute for ovulation tests or medical advice.
Pregnancy week by week
Switching to pregnancy mode replaces cycle predictions with fetal development updates, symptom checklists, and articles matched to your due date. It is one of the better free pregnancy companions, though the upsell to Premium content continues throughout.
Cycle and symptom tracking
Beyond period dates, Flo logs dozens of symptoms, moods, discharge types, and lifestyle factors, then surfaces patterns between them. The breadth of trackable items is a genuine strength, and the history view makes doctor conversations easier.
Anonymous Mode
Introduced after Dobbs raised the stakes for reproductive data, this mode lets you use Flo without your name or email attached to your health records, so the company cannot connect the data to you if compelled. Turning it on disables some account features.
Health Assistant and articles
A large library of articles and courses, reviewed by medical professionals, covers cycles, contraception, and pregnancy. Quality is above the category norm, though the most in-depth content sits behind the Premium subscription.
Secret Chats community
An anonymous discussion space lets users ask questions they might not raise elsewhere. Moderation is active, but as with any peer forum, answers vary in quality and should not replace professional advice.
