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Cycle Day

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Until Next

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6-Mo Avg

Day 1Day 28

Menstrual

Follicular

Ovulation

Luteal

Add entry

Today

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Cycle Stats

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6-Mo Avg

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All-Time Avg

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Cycles Logged

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Fertile Days

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Avg Period

Upcoming Periods

Start End Duration

Cycle History

Dates Period Cycle Flow Pain Mood

No history yet.

Short (<26d) Normal (26–32d) Long (>32d) Shifted (>3d from 6-mo avg)

How it Works

My Cycle Keeper estimates your fertile window by tracking cycle patterns. Ovulation is estimated ~14 days before your next period. Fertile days are calculated as day 8 through (cycle length − 11).

For regular 28-day cycles, this means days 8–17 are typically fertile, with ovulation around day 14.

⚠️ This is an estimation tool only. Not for contraception. Stress, illness & medications can shift timing.

About My Cycle Keeper

My Cycle Keeper is a personal fork of Your Cycle Keeper, the open-source period tracker by pythonime-lab, with changes applied for personal preferences.

If you find it helpful, consider supporting the original developer on GitHub.

Both Your Cycle Keeper and this fork are free forever — no ads, no tracking, and no data collection. Estimates are for personal information only. Not for contraception. Stress, illness, and medications can shift timing.

Version: 1.0.0-beta
License: GNU General Public License v3.0

About This Fork

This personal fork adds rolling 6-month cycle predictions, drip CSV import/export (plus a My Calendar converter), auto-fill for period days, late-period status messaging, themes/layout options, and compact cycle history with email sharing.

Some upstream features were removed; prediction ideas and CSV format were informed by drip by bloodyhealth. Built with AI-assisted coding — use at your own risk.

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Privacy Guarantee

My Cycle Keeper collects zero data. This app:
• Stores all data locally on your device only
• Has no servers, no accounts, no cloud storage
• Has no analytics, no tracking, no telemetry
• Has no ads, no third-party code
• Never transmits any data anywhere
• Is encrypted with your PIN via AES-256-GCM

Your health data is yours alone.

Medical Disclaimer

⚠️ This app provides cycle estimations based on average biological patterns. It is not medical advice and must not be used as a substitute for professional medical consultation.

My Cycle Keeper predicts your cycle by tracking patterns and estimating ovulation timing. Actual cycle timing can vary due to stress, illness, medications, and many other factors.

Do not use this app as a contraceptive or fertility guarantee. Always consult a qualified healthcare professional for medical decisions.

Accessibility

My Cycle Keeper follows WCAG 2.0 accessibility standards:

• Tab/Shift+Tab: Navigate forward/backward through all interactive elements
• Arrow Keys: Navigate calendar dates (complex grid component)
• Enter/Space: Activate buttons and links
• Escape: Close modals and return focus to trigger element
• PIN Entry: Type digits 0-9 and Backspace on all PIN screens
• Form Controls: Native keyboard support for inputs, selects, and textareas
• Screen Readers: Semantic HTML with proper ARIA labels and roles
• Focus Management: Visible focus indicators, logical tab order

Standards based on Salesforce Accessibility Guidelines.

Language

Calendar

Show fertility estimates

Shows estimated fertile and ovulation days in the calendar and Fertile Days in stats.

Show cycle phase timeline

Shows the Menstrual, Follicular, Ovulation, and Luteal phases. Turn off for a simple period progress timeline.

Cycle Settings

Period duration (days)

Prediction tolerance (days)

Days shown before/after each predicted period in the calendar. Leave blank to use auto (based on your cycle regularity).

Auto-fill expected period days ahead

Fills this many days after the period start day with light flow (e.g. 5 = start day + 5 more days = 6 days total). Leave blank for auto (avg period length from your last 6 months of logs). Set to 0 to disable.

Cycle History Maintenance

Rebuilds your cycle history and predictions from your logged flow days. Use this if history or predictions ever look out of sync — it's safe and doesn't touch your logs.

Theme

YCK Classic

Newsroom Light

Newsroom Dark

Pink Power 🌸

Customize

Security & Privacy

AES-256-GCM Encrypted

All data is encrypted with your PIN before being stored. Cycle Keeper uses the Web Crypto API — the same standard used by browsers for HTTPS.

Zero data is sent to any server. No accounts. No analytics.

Google Drive backup

Encrypted one-way backup to a hidden app-data folder in your Google Drive — not two-way sync. The app cannot access your other Drive files, and we have no server that can read your encrypted data. Logging on one device does not update another; use this to restore on a new phone or after clearing app data.

Web app updates

Check for the latest web version without clearing your local data. Your encrypted records remain in IndexedDB; after reloading, you may need to enter your PIN again.

Erase All Data

Storage used: Calculating...

⚠️ Data Persistence: Your data is stored in IndexedDB. Clearing browser cache is safe, but clearing "site data" or "cookies and site data" in your browser settings WILL erase all your cycle data. Always export a backup first!

My Cycle Keeper