Luna: Period Tracker

Ovulation & cycle calendar - private period tracking that stays on your iPhone.

Screenshots

Why you'll love Luna: Period Tracker

Cycle Predictions

Next period, ovulation, and fertile window estimates computed on-device from the cycles you log.

72-Symptom Catalog

Log flow, symptoms, moods, basal body temperature, test results, and notes in seconds.

BBT Chart

Chart basal body temperature readings - rendered only from real readings, never filled in or guessed.

Pregnancy Mode & PDF Reports

Switch to pregnancy tracking and export PDF cycle reports to share with your clinician.

Luna is a completely free period and cycle tracker. Log your period, symptoms, mood, and temperature, and Luna estimates your next period, ovulation, and fertile window - all computed on your iPhone.

Track flow, symptoms, moods, basal body temperature, tests, and notes with a 72-symptom catalog and a BBT chart. Switch to pregnancy mode when you need it, and export PDF cycle reports to share with your clinician.

NO ACCOUNT. NO SERVER. YOUR DATA STAYS YOURS.
Everything you log is stored on your iPhone. Luna has no account and no server, and the developer has no access to your data. An optional iCloud backup (off by default) saves an encrypted copy in your own private iCloud so a new phone can restore it, and Luna touches Apple Health only if you turn those connections on.

WHY FREE?
Apps like this are wildly popular because they're genuinely useful, and people pay for them. So why did I make Luna completely free? I don't need ads and I don't need to charge a subscription, because I don't need the money. And maybe someday they become popular enough to lead to bigger opportunities. But I'll never charge for these. That's all. Plain and simple.

Luna is not a medical device and is not a method of contraception. Predictions are estimates based on the data you log.

Perfect For

Cycle Tracking: Know when your next period is coming and plan around your cycle.
Trying to Conceive: Follow ovulation and fertile window estimates alongside your BBT chart.
Pattern Spotting: See how symptoms and moods line up with your cycle over time.

Frequently Asked Questions

Is Luna really free?

Yes. Luna is completely free - no subscriptions, no in-app purchases, no ads, and no locked features.

Is my cycle data private?

Yes. Luna has no account and no server; your data is stored on your iPhone and the developer has no access to it. The optional iCloud backup is off by default and lives in your own private iCloud.

Can I rely on Luna to prevent pregnancy?

No. Luna is not a method of contraception and is not a medical device. Its predictions are estimates based on the data you log, and cycles vary.

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