Kalena: Period & Cycle Tracker

Know your flow with kalena.

Most period trackers quietly upload your most sensitive health data to their servers and then sell subscriptions to let you see it. kalena is different. Your period logs, symptoms, and cycle predictions never leave your device. Ever.

What does kalena do?

- Tracks your menstrual cycle, predicts upcoming periods and fertile windows, and gets smarter the more periods you log

- Log a period in seconds. Check your predictions. That's it.

Free Features

✦ Period logging with flow intensity (light, medium, heavy, spotting)
✦ Next period predictions
✦ Fertile window and ovulation estimates
✦ Symptom tracking - cramps, mood, fatigue, headaches and more
✦ Cycle statistics and insights dashboard
✦ Optional fingerprint / biometric app lock
✦ Works completely offline
✦ Data Export — Download all your data as JSON or CSV whenever you want
✦ Backup & Restore - Export a full backup of your data to keep it safe when switching phones

Premium Features - One-time, Affordable Purchase

✦ Unlock everything kalena can do with a single payment. No recurring charges.
✦ AI-Powered Predictions - Smarter forecasts that learn your unique cycle patterns, with a confidence score and expected date range
✦ BBT Temperature Tracking - Log your basal body temperature each morning and let kalena detect your ovulation from the data
✦ Advanced Analytics - Cycle length trends, period duration charts, and pattern detection over time
✦ Health Reports - Generate a PDF summary of your cycle history to share with a healthcare provider

Private by design

kalena was built from the ground up with one non-negotiable rule: your health data never leaves your phone.

✗ No cloud synchronisation
✗ No account required
✗ No analytics
✗ No advertising frameworks
✗ No data shared with third parties

Everything is stored locally using an on-device database. No login. No email address.

Who is kalena for?

This app is for anyone who wants reliable cycle tracking without handing their most personal health data to a tech company. Whether you're tracking for general awareness, understanding your patterns, or supporting family planning, your data is yours alone.

Simple Pricing

▎ Free forever, with all the essentials included.
▎ Upgrade once for lifetime access. No subscription. No renewals.

kalena provides cycle estimates based on your logged data. It is not a medical device and should not be used as a contraceptive method. Consult a healthcare provider for medical advice.