Locklune

Constant Learning

About this app

Locklune tracks your period and cycle entirely on your device - encrypted, offline, always private.

There is no account to create. No server receives your data. No analytics, no ads, no tracking SDKs. Everything you log stays locked inside your phone, protected by AES-256 encryption tied to your PIN.

WHY LOCKLUNE?

Most period apps send your most intimate health data to the cloud. Locklune doesn't. It can't - it has no network access. Your cycle history, symptoms, moods, and predictions are encrypted the moment you enter your PIN and never leave your device.

FEATURES

• Period & cycle tracking - log when your period starts and ends, with flow intensity for each day
• Smart predictions - Locklune learns your personal cycle length and improves its estimates the more you log
• Fertile window & ovulation - see your estimated fertile days and ovulation date at a glance
• Cycle phases - know which phase you're in today (menstrual, follicular, ovulatory, luteal)
• Symptom & mood logging - record how you feel each day and spot patterns over time
• Calendar view - see past periods, predictions, fertile days, and logged entries in one place
• Insights - average cycle length, period length, variation, cycle chart, and upcoming period dates months ahead
• Tomorrow preview - see what to expect the next day based on your history
• Optional reminders - local, on-device notifications for your period and fertile window (no internet needed)

FIVE CYCLE MODES

1. Cycle tracking - full period and fertility view
2. Period tracking only - periods logged; fertility content hidden
3. Trying to conceive - fertile window and ovulation focus
4. Contraception - tracks bleeds; fertility details hidden for hormonal method users
5. Pregnant - switches to a pregnancy progress view (week, trimester, days remaining)

PRIVACY BY DESIGN

Locklune's entire premise is privacy and security. The app contains no network code and no tracking. Each database is unique to the device is installed on, and is encrypted with SQLCipher using a key derived from your PIN - without your PIN, the data is unreadable, even to us. There is no account recovery by design. The app works without any internet connection and has no background network activity.
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Locklune is built for anyone who wants to understand their body without trading their privacy to do it.

What’s new

Welcome to Locklune!
Encrypted cycle tracker. No account, no cloud. Your data never leaves your phone.