28X Private Period Tracker

A private, free period tracker designed for every life stage.
28X is a free, privacy safe period and cycle tracker designed to support women and girls everywhere.
Track your cycle with confidence. All health data stays on your device.
Never shared. Never sold. Never stored in the cloud.
Unlike traditional period trackers, 28X is free to use with no subscriptions or locked features. We do not monetise your data.

Why choose 28X
- Private by design with on device data storage
- Free to use with no ads or paywalls
- Calm, thoughtful tracking without pressure
- Built for long term understanding, not data extraction
- Designed with intention, 28X creates a beautiful, stigma free space to understand your cycle and symptoms at your own pace.

To keep 28X accessible for everyone, we offer an optional pay it forward feature to support development and women and girls in vulnerable communities worldwide.
Periods are better on 28X.

Track Your Cycle
Simple, private period and cycle tracking for every life stage.
Whether you are 13 or 50, from first periods to perimenopause and menopause, 28X helps you track what matters to you.
- Period and cycle tracking
- Clear menstrual phase predictions
- Personal diary for tracking mood and symptoms throughout your cycle
- Track privately, with all data stored on your device

Learn About Your Cycle
28X includes articles to help you understand your own patterns and experiences.
Topics include:
- Understanding your cycle phases
- Common monthly changes
- Life stage transitions
- Supporting your wellbeing
All content is for general informational purposes only and is not medical advice.

Privacy first, by design
Your health data stays with you.
- All data stored on your phone
- No cloud storage
- No tracking or profiling
- No ads or paywalls to unlock insights
Health tracking built around you, not your data.

For Everyone, Everywhere
28X is free, global, and inclusive. Designed for all backgrounds and life stages, from first periods to menopause.
Understand your body without giving up your privacy.

28X is not a medical device and doesn’t diagnose, monitor, prevent, treat or predict any health condition. It’s also not designed to help you get pregnant or avoid pregnancy. All content is provided for general informational purposes only and does not constitute medical advice. Always speak to a healthcare professional for personal medical advice.