# Crimson: Cycle & Fertility — AI Period & Fertility Tracker > AI-powered period and fertility tracker with personalized cycle insights. (iPhone/iPad app by Ryan Martin.) - Source: https://appshunter.io/ios/app/crimson-cycle-and-fertility/id6759844678 (this page in markdown: same URL + `.md`) - Developer: [Ryan Martin](https://appshunter.io/developer/1868504128) - Category: Health & Fitness, Medical - Price: Free with in-app purchases - Rating: 5.00/5 from 1 App Store ratings - Age rating: 12+ - Requires: iOS 15.0 · 44 MB - Languages: American English - Released: 2026-07-27 - Data updated: 2026-08-31 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/crimson-cycle-and-fertility/id6759844678/reviews.md ## What is Crimson? Crimson is an AI-powered period and fertility tracker that helps you decode your cycle. Track your periods, predict fertile windows, and get personalized insights — all with the help of intelligent AI analysis. SMART CYCLE TRACKING: - Log periods, symptoms, moods, and daily health data - Automatic cycle length calculation and predictions - Fertile window and ovulation estimates - Visual calendar with color-coded cycle phases AI-POWERED INSIGHTS: - Chat with an AI assistant that understands your cycle - Get personalized insights based on your tracking data - Understand patterns in your symptoms and moods - Context-aware responses tailored to your current cycle phase PREDICTIONS & ANALYTICS: - Weighted moving average predictions that improve over time - Cycle regularity scoring - Phase detection (menstrual, follicular, ovulation, luteal) - Historical trends and pattern visualization PRIVACY FIRST: - Works offline with local storage - Secure cloud sync with encryption in transit and at rest - Your data stays yours — no selling to third parties - Free account with secure sign-in keeps your data backed up BEAUTIFUL DESIGN: - Clean, intuitive interface - Dark and light mode support - Elegant charts and visualizations - Quick daily logging with minimal taps Whether you're tracking for fertility awareness, health monitoring, or simply understanding your body better, Crimson gives you the tools and intelligence to take control of your cycle. Privacy Policy: https://getcrimson.app/privacy Terms of Use: https://getcrimson.app/terms ## Key features - AI-powered cycle tracking - Fertile window and ovulation prediction - Personalized health insights - Offline functionality - End-to-end encrypted cloud sync - Intuitive design with dark/light modes ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Crimson Pro (Annual) | $39.99 | per year | | Crimson Pro (Monthly) | $6.99 | per month | ## Frequently asked questions about Crimson ### How does Crimson use AI to track cycles? Crimson utilizes AI analysis to process your logged periods, symptoms, moods, and health data. This allows for automatic cycle length calculation, prediction of fertile windows and ovulation, and generation of personalized insights tailored to your current cycle phase. ### Is Crimson free to use? The core features of Crimson, including tracking and basic insights, are available for free. For advanced analytics and features, a subscription to Crimson Pro is available, with monthly and annual plans. ### What are the subscription options for Crimson Pro? Crimson Pro offers two subscription tiers: a monthly plan for $6.99 and an annual plan for $39.99. These plans unlock advanced features and deeper insights into your cycle. ### Does Crimson work offline? Yes, Crimson is designed with privacy first and works offline with local data storage. Optional cloud sync with end-to-end encryption is available for data backup and access across devices. ### How accurate are Crimson's predictions? Crimson uses weighted moving average predictions that improve over time as you log more data. It also provides cycle regularity scoring and phase detection for a comprehensive understanding of your cycle patterns. ### What devices does Crimson support? Crimson is available on iPhone, iPad, and iPod. It features a clean, intuitive interface with support for both dark and light modes. ### When was Crimson last updated? The latest version of Crimson, 1.0.3, was last updated on August 1, 2026. The app was initially released on July 27, 2026. ### What is the age rating for Crimson? Crimson has an age rating of 12+, making it suitable for teenagers and adults. The app focuses on providing health information and tracking for users. ## Version history (last 5 releases) ### 1.0.12 — 2026-08-28 Reminders now ask for permission when you finish onboarding, so period and ovulation alerts actually fire. Customize your dashboard — hide and reorder cards — without repeating the same countdowns. Pregnancy week milestones announce on the right day. ### 1.0.9 — 2026-08-26 Reminders now ask for permission when you finish onboarding, so period and ovulation alerts actually fire. Customize your dashboard — hide and reorder cards — without repeating the same countdowns. Pregnancy week milestones announce on the right day. ### 1.0.8 — 2026-08-25 Reminders now ask for permission when you finish onboarding, so period and ovulation alerts actually fire. Customize your dashboard — hide and reorder cards — without repeating the same countdowns. Pregnancy week milestones announce on the right day. ### 1.0.7 — 2026-08-21 Reminders now ask for permission when you finish onboarding, so period and ovulation alerts actually fire. Customize your dashboard — hide and reorder cards — without repeating the same countdowns. Pregnancy week milestones announce on the right day. ### 1.0.6 — 2026-08-19 Account deletion now fully removes your account. Reminders fire at the correct local time in every timezone. Localized health screenings in five languages, pregnancy daily logs in PDF reports, and clearer AI privacy details. --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-31.*