The period tracker you can share
Log your period in a tap. Share your calendar with your partner or doctor, talk it through in the app, and stop sharing anytime.
Free on iPhone and Android.
Scan to get the app.
A period tracker that does the counting
Tap the day your period starts. Lune Line fills in your usual length, shows your cycle day and stage, and keeps your last six cycles in view.
- A heads-up before your period – and a nudge if you forget to log it.
- Forecasts that update as you log. Estimates, never promises.
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Send your code
Share your invite code with your partner or doctor.
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Approve the request
They enter your code in Lune Line. You approve, and your calendar appears on their phone.
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Change your mind anytime
Stop sharing or disconnect in a tap. Their access ends right away.
Talk where the calendar is
Message the people you share with, right inside Lune Line. Plan around a trip, check in on a rough day, or ask your doctor a quick question – no app-switching.
A private, protected space for just the two of you – no one else in the room, and no chance of a personal message landing in the wrong chat.
You can only chat with people you’ve connected with.
Your cycle, and the people you trust with it
For you
Your private tracker. Nothing is shared until you share it.
For your partner
They’ll know where you are in your cycle without asking – and can check in on the hard days.
Your partner sent you here? Get Lune Line and enter their invite code – you don’t need a cycle to follow one. Get the app
For your doctor
Real dates at your appointment instead of guesses. Share before the visit, stop after.
Your cycle stays yours
Security
Lock the app with a PIN. Your cycle data and PIN are encrypted on your device.
Anonymity
No real name or phone number needed – just an email. Usage analytics aren’t linked to your identity.
Control
Nothing is shared until you share it, and you can stop sharing or disconnect anytime. Delete your account and data from inside the app. No ads, and we don’t sell your data.
What people say
Little things for comfort
Period care, hygiene and comfort essentials for her, him and couples – in our small curated shop.
Questions, answered
Is Lune Line free?
Yes. Lune Line is free on iPhone and Android, including tracking, sharing and chat.
How does sharing work?
You send your invite code. The other person enters it in Lune Line, you approve the request, and they can see your calendar.
Can the people I share with change my data?
No. They can see your calendar, but they can’t edit it.
Can I stop sharing?
Anytime. Stop sharing or disconnect in the app, and their access ends right away.
Can I follow my partner’s cycle?
Only if they share it with you. Install Lune Line, enter their invite code, and they approve your request. You don’t need a cycle of your own.
Can I share with my doctor?
Yes. Your doctor connects the same way, with your code. Share before an appointment and stop afterwards if you like.
How accurate are the forecasts?
We test our forecasts against irregular cycles, long gaps and time-zone changes, and they update as you log. They’re still estimates – bodies change, so treat them as a guide, especially if your cycle is irregular.
When do I get reminders?
Before your next period is due, plus a nudge if it looks like you forgot to log the start. You can turn notifications off anytime in your phone’s settings.
Can I use Lune Line anonymously?
Almost. You need an email to create an account, so your data syncs and sharing works – but no real name or phone number. Usage analytics aren’t linked to your identity, and nothing is shared unless you share it.
How is my data protected?
You can lock the app with a PIN, and your cycle data and PIN are encrypted on your device. Nothing is shared unless you share it, and you can delete your account and data in the app. The full details are in our privacy policy.
Can I use Lune Line as birth control?
No. Lune Line isn’t a method of contraception and can’t tell you when it’s “safe.” Fertile-window estimates are for awareness and planning only. Talk to a doctor about contraception.
Does Lune Line give medical advice?
No. It’s a tool for tracking and planning. If something feels off, talk to a qualified healthcare professional.
Your cycle. Your call.
Free on iPhone and Android.