What is the best period tracker for Muslim women?

There is no single best period tracker for every Muslim woman, but there is a short list of things worth checking before you pick one, and most mainstream trackers were not built with any of them in mind.

• It should tell hayd, istihadah and nifas apart, not just count days. A calendar app that predicts your next period from an average cycle length is not built for the questions that actually decide whether you pray or fast: how hayd is recognised, whether irregular bleeding counts as hayd at all, and how nifas is counted after childbirth. It also needs to make it obvious when a period is running later than expected in the first place; see why your period might be late for the usual reasons it can shift. A tracker built for this needs to log what the blood actually looked like, not just a start date, and apply the position of the madhab you follow rather than one generic rule for everyone.
• It should keep a running qada count. Every fast missed to hayd or nifas during Ramadan is owed before the next Ramadan, and the count is easy to lose track of across a year, especially with more than one Ramadan's fasts still outstanding. A tracker worth using logs each missed day as it happens rather than asking you to reconstruct it from memory months later.
• It should not sell or share what it logs. Menstrual data is already sensitive on its own; layered with a record of when you are and are not praying or fasting, it says a great deal more about you. This is not a hypothetical risk: in 2023 the U.S. Federal Trade Commission ordered the maker of the period tracking app Premom to stop sharing users' health data with Google and other companies for advertising, after finding it had done so without their consent. A separate review of popular period and ovulation trackers by the Mozilla Foundation found most of them collected far more than they needed and were unclear about who saw it afterward. Read the privacy policy before your cycle history does; see our answer on the best period tracker for privacy for the fuller checklist.
• It is worth tracking at all. This part has nothing to do with faith specifically: the American College of Obstetricians and Gynecologists recommends treating the menstrual cycle as a vital sign worth watching alongside things like blood pressure, since changes in it can be an early flag for other health conditions, and the NHS lists keeping a record in an app or diary as the practical way to tell whether your periods are actually irregular. Cycle length is the first thing worth watching, since it is what defines regular in the first place; see what counts as a normal cycle length for the typical range and when a shift outside it is worth a doctor's visit. The same logic applies to symptoms that cluster around your cycle rather than your bleeding itself, such as the headaches many women get in the days before their period, the mood swings that follow the same schedule, or the breakouts that follow the same hormonal schedule: a tracker is what turns "it happens sometimes" into a pattern you can actually show a doctor.

If you are currently using Flo and weighing whether to switch, see how the best Flo alternative for Muslim women actually compares app by app before you decide.

Nisaa was built around the first two points specifically. It reads what you log and names your state as hayd, istihadah, nifas or tahara using the position of the madhab you choose, keeps a running total of the Ramadan fasts you still owe, and does not sell what you log. If that is what you were looking for, it is on the App Store.