Luma.
Simple, private cycle tracking for Android. Log your periods, understand your cycle, and see your fertile window, with no account, no cloud, no fuss.
Your personal cycle companion.
Luma is a focused Android app for anyone who wants a clear, honest picture of their menstrual cycle, without the noise, subscriptions, or privacy concerns that come with most period trackers.
Log your periods with a simple flow rating and optional notes. Luma uses your history to predict your next period and fertile window, displayed on a clean cycle wheel and a monthly calendar view. No algorithm black boxes, no data harvesting.
Everything stays on your device. There are no accounts to create, no cloud services to trust, and no subscriptions to maintain. Your health data belongs to you.
Built for real people.
Knowing what to expect
Luma predicts your next period and shows your fertile window based on your actual logged history, so you can plan ahead with confidence.
Understanding your body
See your current cycle phase, track patterns over time, and build a personal record that can support conversations with your GP or gynaecologist.
Privacy-conscious users
Menstrual data is sensitive. Luma never connects to the internet, never creates an account, and never shares anything. Your data is yours alone.
Keeping it simple
No mood logs, no symptom questionnaires, no wellness coaching. Luma does one thing well: helps you track your cycle clearly and without clutter.
Everything you need. Nothing you don't.
Log periods instantly
Record a period day with a single tap. Choose a flow level (spotting, light, medium, or heavy) and add an optional note. Date defaults to today but can be changed for back-logging.
Cycle wheel
The home screen shows a visual cycle wheel with your current day, period arc, and fertile window arc at a glance. See how many days until your next period, and which phase you're in.
Monthly calendar
Switch to the calendar view for a monthly overview. Period days (logged and predicted) and your fertile window are clearly highlighted so you can see the shape of your cycle at a glance.
Cycle phase awareness
Luma identifies your current cycle phase (menstrual, follicular, ovulatory, or luteal) and displays it on the home screen so you always know where you are in your cycle.
Notes on entries
Add an optional note to any logged period day to capture anything relevant, such as symptoms, pain levels, or anything else you want to remember. Useful when talking to a healthcare provider.
Light and dark theme
Luma follows your system's light or dark theme preference automatically. Switch using the icon in the top corner of the app at any time.
See it in action.
A calm, clear interface designed to give you what you need without overwhelming you.
Home
Calendar
Log period
Your cycle data is sensitive. We treat it that way.
Luma stores all data locally on your device using Android's secure storage. We have no servers, no analytics, no advertising SDKs. We can't see your data, and neither can anyone else.
Menstrual health data is among the most personal data someone can have. Luma is built on the principle that it should never leave your device unless you explicitly choose to share it.
Interested in Luma?
Luma is coming to Android. Want to share thoughts on what you'd like to see, or be among the first to hear when it's ready?