---
title: Period tracker for PCOS and irregular cycles
description: A free iPhone period tracker for irregular cycles and PCOS (PMOS): predictions as a likely window from your own cycles, honest when a period runs late, no account.
url: https://www.arbazsiddiqui.me/app/iris/pcos-period-tracker/
---

# A period tracker for PCOS and irregular cycles

When your cycles swing by a week or more, one predicted date is just a guess. Iris gives you the window your period is likely to fall in, from your own history.

App Store: https://apps.apple.com/app/id6761134901

## A window, not a single date

Iris looks at your past cycles and shows the range your next period is likely to land in, such as day 33 to 43. If your period runs past that window, Iris says so plainly and waits for you to log, instead of pretending it knows.

## Built from your own cycles

Predictions start with the dates you give it and sharpen each time you log a period. Long cycles, short cycles and the odd outlier all count, so the window reflects how your body actually behaves rather than a textbook 28 days.

## Track what matters to you

Log flow, symptoms, mood, discharge, sleep, weight and notes, and hide what you don't track. LH tests and basal temperature help show whether and when you ovulated in a long cycle.

## A report for your doctor

Irregular periods or long gaps between them are one of the main symptoms of PCOS, the condition the NHS now calls PMOS ([NHS: PCOS](https://www.nhs.uk/conditions/polycystic-ovary-syndrome-pcos/)). Iris exports a PDF of your cycles and symptoms to take to an appointment, so the conversation starts from real dates.

## Questions

**Does Iris work with PCOS?** Yes. Set your cycle type to irregular and Iris shows a likely window based on your history instead of a single date.

**Can Iris diagnose PCOS?** No. Iris tracks and estimates; only a doctor can diagnose PCOS. The doctor report helps you bring your history to that appointment.

**Is it free?** Yes. Every feature is free; a one-time purchase removes ads.

Iris is not a contraceptive. Its predictions are estimates.