100% Private & Local
Track your cycle visually, predict key dates instantly.
No accounts. No cloud storage. A beautifully simple utility designed to give you clarity over your cycle, stored securely on your own device.
Instant Insights
Log your dates and immediately see your estimated fertile window, next period prediction, and average cycle length. Everything calculates entirely in your browser.
June 2026
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Period
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Fertile Window
Today
Privacy First
Your data never leaves your device. We use local storage so your health information remains yours alone.
Visual Calendar
Spot patterns easily with an intuitive color-coded calendar that highlights your period and fertile window.
Smart Predictions
Our algorithm learns your unique rhythm over time to give you more accurate next-period estimates.