Welcome to Petal Chan, the privacy-first period, cycle, and fertility tracker designed to give you complete control over your health data.

Unlike other tracking apps, Petal Chan is 100% offline. Your personal data never leaves your phone, is never uploaded to the cloud, and is never sold to third parties. Experience total peace of mind with our secure, beautifully designed interface.

✧ KEY FEATURES

• 100% Offline & Private — Your data stays on your device. Period. No accounts, no cloud, no exceptions.

• Accurate Cycle Tracking — Log your period, predict ovulation, and track your fertile window with a smarter prediction engine refined through continuous updates.

• IUD & Symptom-Only Tracking — Don't get a regular period? Whether you have a hormonal or copper IUD, use a birth control implant, or experience amenorrhea and highly irregular cycles, Petal Chan adapts to you. Enable "Symptom-Only" mode to track your mood, cervical mucus, and body signals on your own terms—without forcing inaccurate period predictions.

• BBT Tracking & Ovulation Detection — Log your Basal Body Temperature each morning and watch Petal Chan chart your thermal shift curve to confirm ovulation automatically. Supports °C and °F. Your most accurate fertility window, no subscription required.

• Cervical Mucus & LH Test Logging — Track all four cervical mucus types and log your LH ovulation test strips as negative, high, or peak. Combined with BBT, Petal Chan builds a complete, science-backed picture of your fertile days — entirely on-device.

• Biometric Security — Lock the app with your fingerprint or Face ID. The app also blurs itself in your recent apps list so only you ever see your data.

• Expanded Daily Logs — Log Mood, Symptoms with severity ratings, Energy levels, Food cravings, and more. New cycle visualisers help you spot patterns at a glance across months.

• Dedicated Mood Tracking — Beautifully designed mood tracking to keep yourself and your data updated.

• Multiple Language Support — Use Petal Chan in English, Spanish, French, German, Portuguese, or Tagalog, and switch anytime in Settings.

• "Period is Late" Helper — Built-in guidance for irregular cycles that also adjusts your predictions automatically.

• Home Screen Widget — See your current cycle day and upcoming dates at a glance without opening the app.

• Flo, Clue & CSV Import — Switching from another app? Import your history from Flo, Clue, or any CSV export. Your data, your choice, always.

• Secure Data Export — Export your full history to a CSV file anytime for your own records or to switch devices with ease.

✧ YOUR PRIVACY, GUARANTEED

Petal Chan is built from the ground up with privacy as its foundation — not an afterthought. No trackers, no analytics, no ads. All predictions and BBT analysis run locally on your device using well-established cycle science, so your data never needs to leave your phone to work accurately.

✧ NO SUBSCRIPTIONS. NO ADS.

Tired of paying monthly fees just to understand your body? Petal Chan offers a generous free experience, plus a simple one-time payment to unlock all Chan+ modules and features forever. Try Chan+ risk-free with our built-in 15-day free trial.

✧ BUILT WITH CARE

Petal Chan is independently developed and actively maintained, with regular updates focused on accuracy, design, and user-requested features. Every update is a direct result of listening to our growing community of users.

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Petal Chan is a health-tracking tool for informational purposes only. It is not a medical device and does not diagnose, treat, cure, or prevent any medical condition. It should not be used as a method of contraception or to assist with conception. Always consult a qualified healthcare professional for medical advice, diagnosis, or treatment.

Take back your privacy and understand your cycle better with Petal. Download today.