Luteal is a private period and cycle tracking app for iPhone. It tracks your menstrual phases, mood, symptoms, and ovulation, and lets you share your cycle with a partner.

Luteal is free to download on the App Store. A premium version with additional features is available as an in-app purchase.

Yes. Luteal is built with privacy as a first principle. Your cycle data is encrypted in transit and at rest, never sold or shared with third parties, and never shown to advertisers. Partner sharing is strictly opt-in and revocable at any time.

What is the luteal phase?

The luteal phase is the second half of the menstrual cycle, occurring after ovulation and before your next period. It typically lasts 10 to 16 days and is associated with a rise in progesterone, which can affect energy, mood, sleep, and appetite.

Does Luteal work on Android?

Luteal is currently available on iOS (iPhone) only. An Android version is not yet available.

Sharing your cycle with a partner: useful, but only with consent

Why share cycle context

Sharing a simple view of today's phase, mood, or next period estimate can help a partner understand what is happening without guessing.

It can reduce misunderstandings around fatigue, sensitivity, pain, or the need for support.

What must stay in your control

Sharing should never become surveillance. It should be limited, understandable, and removable at any time.

Luteal gives partners a useful view, not full access to every intimate detail.

Communication, not an excuse

Knowing a cycle phase can support empathy, but it should never be used to dismiss someone's emotions as "just hormones."

Frequently asked questions

Can my partner see my period app?

In Luteal, sharing is optional and controlled by you. You choose to invite your partner, they see a limited view (current phase and mood), and you can remove their access at any time.

What does a partner see in Luteal?

A partner invited in Luteal sees your current menstrual phase, today's mood, and your estimated next period date. They do not have access to your symptom logs or private notes.