Crimson Fairy is a private, beautifully designed period and cycle tracker built for women who want full control of their health data — without ads, without accounts, and without compromise.

TRACK YOUR CYCLE
Log your period start date, flow intensity, symptoms, and mood with just a few taps. The home screen shows your current cycle phase, days until your next period, fertile window, and ovulation prediction — all
calculated locally on your device.

MENSTRUAL CALENDAR
View your full cycle history on an interactive monthly calendar. Tap any day to see what was logged — period days, flow intensity, symptoms, and personal notes — all in one place.

PERIOD & CYCLE HISTORY
Browse your complete period log with flow intensity and symptoms per cycle. Track how your menstrual cycle changes over time with a full scrollable history.

MOOD & SYMPTOM TRACKING
Log your daily mood and track symptoms including cramps, headaches, bloating, fatigue, back pain, nausea, mood swings, breast tenderness, and acne. See patterns emerge across your cycle over time.

INSIGHTS & ANALYTICS
• Cycle length trend chart across all tracked cycles
• Average cycle length and period duration
• Shortest and longest cycles on record
• Irregular cycle detection and alerts
• Mood pattern graph over time
• Fertile window and ovulation predictions

PRIVACY FIRST
Unlike most period tracker apps, Crimson Fairy stores everything locally:
• AES-256 encrypted database — no cloud, no servers
• No account needed — no email, no sign-up
• No ads, no data selling, no third-party tracking
• No internet connection required — ever

Your cycle data is yours. It never leaves your device.

APP LOCK & SECURITY
• PIN lock with configurable auto-lock timer
• Biometric authentication (fingerprint or face unlock)
• Content hiding when app is backgrounded
• Tapjacking protection
• Android 15 Private Space support
• Security health dashboard

BEAUTIFUL THEMES
Choose from 4 colour themes — Calm, Warm, Bold, and Clinical — each with a unique launcher icon and matching colour palette.

PERIOD REMINDERS
Get timely notifications based on your predicted next period date, calculated from your personal cycle history.

11 LANGUAGES
English · हिन्दी · Español · Français · मराठी · தமிழ் · తెలుగు · 中文 · Deutsch · Bahasa Indonesia · Português

WHY CRIMSON FAIRY?
Most period tracker apps require an account and upload your most personal health data to their servers — where it can be sold or breached. Crimson Fairy is different. No server. No account. No tracking. Just a
beautiful, private period tracker that works entirely on your device.

Download Crimson Fairy and take back control of your health data.