Crimson: Cycle & Fertility

Periods, fertility, pregnancy, and perimenopause in one AI-powered app. Free to track, Pro when you want more.

Crimson is one app for every stage: periods, trying to conceive, pregnancy, and perimenopause. Switch modes as your life changes and keep every log in one place, with an AI assistant that understands where you are right now.

CYCLE TRACKING

• Log periods, flow, symptoms, moods, sleep, and more in a few taps
• Predictions that learn from your history: next period, fertile window, ovulation
• Calendar with color-coded phases and a daily brief written for your cycle day
• Streaks and gentle reminders that keep the habit going

TRYING TO CONCEIVE

• Fertile window and ovulation estimates from your cycles, temperature, and symptoms
• Ovulation alerts so the best days never slip by
• Cycle calculators for planning

PREGNANCY

• Week-by-week timeline with baby size and what to expect
• Kick counter and contraction timer
• Weight tracker with expected-gain ranges by trimester
• Appointments with reminders, plus notes on how your body is changing

PERIMENOPAUSE

• Hot flash tracker: severity, duration, and triggers, with quick logging
• Hormone log for FSH, estradiol, and other results, with trends over time
• Patterns and insights that connect symptoms to your cycle as it shifts

AI ASSISTANT

• Ask anything about what you're seeing; it knows your phase, recent symptoms, and mode
• Personalized daily brief and symptom pattern insights
• Educational guidance, not medical advice; your questions are never sold or shared

PRIVACY FIRST

• Works offline; cloud sync is encrypted in transit and at rest
• Face ID sign-in and App Lock keep the app private on a shared phone
• Import period history from Apple Health; log from your wrist with notification actions
• Export your data anytime as PDF reports or CSV
• We never sell your data. You can delete your account and everything in it from Settings.

FREE, WITH PRO WHEN YOU WANT MORE Tracking, the calendar, predictions, and every mode are free forever. Crimson Pro adds unlimited AI, pattern analysis, and reports, with a 14-day trial to start.

Available in English, Spanish, French, German, and Portuguese.

Privacy Policy: https://getcrimson.app/privacy Terms of Use: https://getcrimson.app/terms