What is the best Flo alternative for Muslim women?

There is no single tracker that replaces Flo perfectly for every Muslim woman, but there is a short, honest answer: Flo's privacy practices have genuinely improved, and it remains a capable general cycle calendar, but it still has no idea what hayd, istihadah or nifas are. It cannot tell you whether spotting on day nine still counts as your period, or how many fasts you owe. That gap, not privacy on its own, is the real reason to look elsewhere.

Two things explain why women leave it in the first place.

• Its data history is real, but it is not the current picture. In 2021 the U.S. Federal Trade Commission found that Flo had shared users' health data with Facebook, Google and other companies for years while promising to keep it private, and ordered the company to get explicit consent before sharing it again. The same underlying conduct, from users who logged menstruation or pregnancy information between November 2016 and February 2019, later led to a separate class action: Flo agreed in 2025 to pay $8 million and Google a further $48 million to settle the claims, a deal that received preliminary court approval in April 2026 with a final fairness hearing due that October. To be fair to where the app stands today, Mozilla Foundation's most recent testing scored Flo 7 out of 10 for privacy and found researchers no longer observed it sending logged symptoms or cycle classifications to outside advertisers, a real change from its history. The company has cleaned up its practices. It has not undone the years it did not.
• Most of what makes it genuinely useful sits behind a subscription, and the paid tier still has nothing to say about hayd, istihadah or nifas: it predicts a period from an average cycle length, not whether a day of bleeding is counted or owed. For a Muslim woman that is not a missing nice to have, it is the actual question a tracker exists to answer; see what actually separates a tracker built for that from a generic calendar app. The same gap gets sharper during Ramadan specifically, when what you log ties directly to a running record of fasts owed.

Before you switch, check the same short list for any tracker, including whichever one you pick next:

• Does it tell hayd, istihadah and nifas apart, or just count days? A predicted date is not the same thing as a ruling.
• Has it been independently tested, or does it only describe itself? An outside audit, not the app's own privacy page, is what actually tells you whether a promise holds up.
• What does it say it will do with a legal demand for your data? Most period tracker privacy policies allow the company to hand data over to comply with legal process; the real question is how much it holds to hand over in the first place.
• Can you actually delete what you logged, not just close the account?

Three real alternatives, measured against that list:

• Clue. Mozilla's most recent testing scored it 8 out of 10, ahead of Flo. As a Berlin based company governed by the EU's GDPR, Clue's co-CEOs have stated publicly that they will not turn a user's health data over to any authority, in any country, that could use it against her. What it does not do any better than Flo is the actual Muslim question: no hayd, istihadah or nifas logic, no fasting or prayer guidance at all.
• Apple Health's Cycle Tracking. The most private option by design. With two factor authentication turned on, the cycle data synced to iCloud is end to end encrypted, meaning Apple itself cannot read it, and predictions are calculated on your device rather than a server. But it is a raw log, not an assistant: no symptom write ups, no Islamic logic at all, so you are still deciding for yourself whether a given day counts.
• Nisaa. Built specifically around the first question on the list: it reads what you log and names your state as hayd, istihadah, nifas or tahara using the position of the madhab you choose, and keeps a running qada count rather than leaving you to tally it yourself. It does not sell what you log; see our answer on the best tracker for privacy for what that promise actually rests on. The honest tradeoff: it is newer than Flo or Clue, has not been through the kind of large independent privacy audit both of them have now had, and tracks fewer general symptoms than Flo's list of more than eighty.

If the sticking point is genuinely privacy rather than the religious gap, Apple's own Cycle Tracking or Clue both test out ahead of Flo on that specific question. If the sticking point is that nothing tells you whether you are praying, fasting or owed a make up day, that is the gap Nisaa exists to close, and it is on the App Store.