The app to track your period, and so much more.

Scientific and straightforward—the period tracker app that teaches you about your body

The Apple App Store badgeThe Google Play Store badge
Send yourself a link:

Clue predicts your period, PMS, and fertility.

An illustration of a stethoscope

Get period, PMS, and fertile window predictions based on the most up-to-date science

An illustration of a calendar

See all your tracked data in the Calendar and an overview in Analysis

An illustration of a light bulb

Get more accurate predictions every time you track

There's more to your period.

An illustration of a hand showing the thumbs-up sign inside a speech bubble

Great skin when you ovulate? Headaches during PMS? Learn about your personal patterns with 30+ tracking options: birth control, cramps, emotions, skin, hair, sleep, sex, pain, moods, cervical fluid, and more

An illustration of a chain link

Enhanced iOS features, including reproductive health integration with the Health app, Touch ID and Today Extensions

Predictions and analysis unique to you and your body.

An illustration of a bell

Set up custom notifications to remind you when your period is coming, and more

An illustration of a cycle

Learn more about why your cycle may be considered irregular or regular

An illustration of science-related objects floating above an open book

Tips, remedies, and educational content based on science.

In-depth information about the menstrual cycle, complete with medical and scientific references

An illustration of a diverse group of people

10 million people trust us with their data.

Import, export, or delete your health data at any time. Clue keeps your private health information safe and secure. Never lose access to your tracking history, by creating a Clue account or saving backups to your email or online storage.

The Apple App Store badgeThe Google Play Store badge
Sign up for free:

You get more features with Clue Plus.

Enhanced Analysis gives you a detailed look at your period length, menstrual cycle length, and cycle variation, alerting you when anything is out of the normal range for your age and birth control type.

Forecast expands on Clue’s standard period, PMS and fertile window predictions to let you know when to expect anything you’ve tracked that has a cyclical pattern—cravings, energy levels, cramps and more.

Your subscription contributes to advancements in menstrual and reproductive health research that benefits people around the world.

The Apple App Store badgeThe Google Play Store badge
Discover Clue Plus:
FeaturesClueClue Plus
Period, PMS, and fertility predictions
30+ categories to track all your symptoms
Custom reminders
Science-based knowledge base
Help us push menstrual and reproductive health forward
Enhanced Analysis notifies you if anything is out of the normal range
Forecast tells you what symptoms are coming up
Support Clue

What Clue users have to say

A quotemark

It gives me freedom, it takes pressure off me. I don’t need to keep my cycle in mind, Clue just does it for me and I never have to calculate and think about it, I can just check the app.

— Majken

A quotemark

Everyone should use this and I wish I'd known about it sooner, especially when I was just starting to figure this out. The predictive calendars are just as helpful as the science-backed info that I receive through the app, email, and social media. Clue tells me about my personal health and how my body works in an open, accepting, informative, non-clinical way.

— Jane

A quotemark

I like the streamlined look of the app, the tags feature for things specific to me, 80% of the other inputs you can add, and the fact that it’s gender neutral.

— Jess

Featured In

Logos of various press outlets