PCOS Period Tracker: 6 Apps Compared (2026)

A PCOS period tracker has one job that most apps skip: keeping an honest record when your cycle refuses to follow a pattern. With PCOS, periods can arrive every few weeks or disappear for months, so the useful app is the one that logs what happened, labels its guesses as guesses, and gives you a clean history to take to a doctor. Six apps do that well enough to compare, and this guide takes each one on what it logs, what it predicts, and what it admits it does not know.

If you are here because your cycle has been unpredictable for a while and you do not yet have a diagnosis, that is common ground. The World Health Organization estimates that up to 70% of women with PCOS do not know they have it.

What is the best PCOS period tracker?

The best PCOS period tracker is one that records irregular cycles honestly instead of forcing them into a 28-day template. That means three things: it keeps every logged period at its real length, it can switch off or clearly label predictions it cannot support, and it logs the wider PCOS signs a doctor will ask about. Clue does the first two best, Apple Health does them for free, and AskPCOS does the third.

The reason this matters is in the biology. The Office on Women’s Health explains that with PCOS the egg may not develop or be released as it should, so periods can be missed, come fewer than eight times a year, or arrive every 21 days or more often. A tracker that projects your last cycle forward is guessing at a cycle that may not have a next date yet.

Why do most period trackers struggle with PCOS?

Because they predict from averages, and PCOS cycles do not average well. Every calendar app takes the cycle lengths you logged and projects the next start date from them. That works when cycles land within a few days of each other and breaks when one runs 24 days and the next runs 70.

Ovulation is the bigger problem. Cleveland Clinic describes PCOS as causing irregular cycles, missed periods and unpredictable ovulation, and the WHO calls it the most common cause of anovulation worldwide. An app that draws a fertile window from dates is estimating an event that may not happen that cycle at all.

We cover why date-based ovulation prediction fails in general in how accurate period tracker apps are, and PCOS is the sharpest version of that problem.

So the ranking below rewards honesty over cleverness. An app that says “estimated” or “predictions off” is telling you the truth about a PCOS cycle, and an app that keeps drawing confident circles is not.

PCOS period tracker comparison: 6 apps at a glance

Two apps that show up in this search did not make the table. Spot On, from Planned Parenthood, only gives predictions if your periods are regular, which makes it a fine plain diary but not a PCOS tool. Natural Cycles reads temperature rather than dates, which is a different category we come back to in the ovulation section.

Clue: the one that can switch its predictions off

Clue is the best PCOS period tracker for most people because it can hide its predictions. Clue’s own team wrote that some cycles vary so widely that regular predictions are no longer useful, and built a setting to show or hide them. With predictions hidden, the calendar shows only what you logged, which is the view a doctor wants to see.

Clue’s App Store listing describes tracking for skin, hair, mood and energy alongside period dates, and Clue publishes its own library of PCOS articles. The catch is cost: the deeper analysis sits behind Clue Plus, and Clue cannot tell you why a cycle changed, only that it did.

Apple Health: the free one that notices the pattern for you

If you have an iPhone, Cycle Tracking in the Health app is already installed, and it does one thing none of the paid apps here do for free. Apple’s support page explains that Cycle Deviation Detection can inform you if your logged history from the previous six months shows a pattern of irregular cycles, infrequent periods, prolonged periods or persistent spotting.

Infrequent periods is the pattern PCOS most often produces, and Apple watches for it on its own. Predictions still appear, and Apple is clear that they come from the periods and cycle lengths you logged, so the same calendar limit applies. The difference is that Apple is reading the shape of six months of data rather than projecting the last cycle forward.

AskPCOS: the PCOS symptom tracker built by researchers

AskPCOS is not a period predictor, and that is the point. Its App Store listing describes a symptoms tracker, plain-language information about PCOS, healthy-lifestyle guidance, a community forum, and a question list to use at appointments. It was developed at Monash University in Australia, and the app’s own site explains that you can save your symptoms each day and review them by month.

Use it alongside a period tracker rather than instead of one. The listing was last updated in 2023, so check that it still runs well on your phone before you build a habit around it.

Flo: the biggest app, with predictions that stay on

Flo’s App Store listing says it supports irregular periods, logs 70 or more symptoms, and includes a Symptom Checker with educational information on PCOS, endometriosis and fibroids. For symptom breadth it is the widest app here.

Its predictions never switch off, but Flo does pull back when it cannot be confident. Flo’s help center says it hides ovulation predictions for cycles predicted to run under 20 or over 60 days, and widens the fertile window to up to 14 days when your cycles vary a lot.

Some third-party sites describe a dedicated Flo PCOS mode. We could not find that feature on Flo’s own pages, so check the app’s settings rather than taking a listicle’s word for it. Our guide to whether Flo is accurate covers its predictions in detail.

Euki: the private record that never leaves your phone

Euki’s App Store listing describes a nonprofit, open-source tracker with no account, data stored only on your device, and customizable tracking that covers monthly bleeding, acne, headaches and cramps, with medication and appointment reminders built in. Its period predictions improve as you log more, and its cycle summary shows your average cycle length and period duration.

For PCOS that combination is quietly strong: acne logging, medication reminders for anything a doctor prescribes, and a record nobody else can see. What it lacks is any pattern detection, so you read the history yourself.

Otty: the one that labels its guesses

Otty starts from the cycle length you set, anywhere from 20 to 60 days, and resets the count the day you log a period start. A short cycle or a long one simply becomes the record, and you can move a start or end date in your cycle history if you logged it late.

When a period is overdue, Otty does not roll silently into a new cycle. The calendar marks those days as estimated and says so in plain words, and logging the real start replaces the estimate.

Otty is honest about its limits here. Its daily check-in covers mood and ten symptoms such as cramps, bloating, low energy and rough sleep, but it does not log acne or hair changes, so it is a cycle and mood record rather than a PCOS symptom tracker. Your data exports as a file you can send to a clinician.

If you have a partner, you can invite them with a code so they see the same phase and estimate labels you do, which keeps an unpredictable cycle from becoming a guessing game for two people.

How to track ovulation with PCOS

You cannot track ovulation with PCOS from period dates alone, whatever app you use. The NHS lists difficulty getting pregnant among the main symptoms of PCOS because the ovaries often do not release an egg each month, so a calendar that draws a fertile window is describing a cycle you may not be having.

If ovulation matters to you, the honest options sit outside the calendar. Basal body temperature rises after ovulation, which is how Natural Cycles confirms it, and ovulation tests measure the hormone surge directly. Both tell you what happened rather than what a template expects.

For conception with PCOS, the right first step is a clinician: the NHS describes treatments that help with irregular periods and fertility, and none of them live in an app.

When is an irregular cycle worth a doctor visit?

Irregular periods are common and are normal at the start and end of the reproductive years, so an unpredictable cycle on its own is not a diagnosis. The NHS says to see a GP if you think you might have the condition or if symptoms are affecting your everyday life, and that having the symptoms does not definitely mean you have it.

The NHS lists the main symptoms as irregular periods or long gaps between periods, excess hair growth or hair loss, weight gain or difficulty losing weight, difficulty getting pregnant, depression or anxiety, oily skin and acne, tiredness, and dark patches of skin on the neck or armpits. Tests are blood tests for hormone levels and insulin resistance and, for adults, an ultrasound scan.

Our guide to what counts as an irregular period and when to check covers the wider list of causes, and the period tracker for irregular periods comparison is the broader version of this one.

PCOS period tracker FAQ

The short version on a PCOS period tracker: choose the app that records honestly, log the months with nothing in them, and take the export to your appointment.