A period tracker that works with PCOS
Most period apps assume a steady 28-day cycle. With PCOS, cycles are often longer, irregular or missing, so those predictions fall apart. LunWise is built to stay useful when your cycle doesn't follow the textbook.
How LunWise helps
- PCOS mode weights your most recent cycles most heavily, so predictions keep up as your cycle changes.
- Every prediction shows a date range and a confidence level, instead of a single date that pretends to be certain.
- Log a basal temperature rise to confirm ovulation. LH tests can be harder to read with PCOS, and temperature helps fill that gap.
- Flags patterns worth raising with a clinician, like cycles over 38 days or 90 days without a period.
- A one-page report of your cycles, symptoms and patterns to bring to appointments.
Why PCOS makes period tracking harder
Polycystic ovary syndrome (PCOS) is common. The World Health Organization estimates it affects 10–13% of women of reproductive age, and that up to 70% of them are undiagnosed. Irregular, unpredictable or absent periods are among its most common signs, because ovulation can happen late, irregularly or not at all.
That's why an average-based prediction often misses. An app that averages a 32-day cycle with a 55-day cycle will be wrong about both. LunWise leans on your most recent cycles and widens its date range when your history varies, so you can see how much to rely on each prediction.
Confirming ovulation with PCOS
Ovulation tests detect a surge in luteinizing hormone (LH). With PCOS, LH levels can be higher overall, so tests may show several positives or stay positive, which makes them harder to read. A sustained rise in your waking (basal) temperature happens after ovulation and can confirm it. LunWise detects that rise automatically when you log temperatures, or import them from a thermometer app or wearable.
What to log
- The first and last day of each period, even when it's months apart
- Bleeding or spotting between periods
- Waking temperature, if you want to confirm ovulation
- Symptoms that matter to you, like acne, hair changes, pain or fatigue
Questions and answers
Can a period tracker predict periods with PCOS?
Yes, with honest limits. LunWise predicts from your most recent cycles and shows a wider date range when your cycles vary. Confirming ovulation with temperature makes the prediction for your next period much more precise.
Are ovulation tests reliable with PCOS?
They can be harder to read, because LH levels may be higher overall and tests can show several positives. Pairing them with basal temperature, which rises after ovulation, gives you a clearer picture. A clinician can advise on the best approach for you.
When should I talk to a doctor about my cycle?
LunWise flags patterns that fall outside clinical guidelines, such as cycles longer than 38 days, cycle lengths that vary by more than about a week, or 90 days without a period. Those are good reasons to book an appointment.
Sources
Last updated October 11, 2026. This page is for general information and isn't medical advice.