# RedCalendar — Cycle Tracker — Women's diary and calendar > Cloud-based cycle tracker for period, ovulation, and fertile day prediction. (iPhone/iPad app by Artem Bolotov.) - Source: https://appshunter.io/ios/app/redcalendar-cycle-tracker/id1535523842 (this page in markdown: same URL + `.md`) - Developer: [Artem Bolotov](https://appshunter.io/developer/901756576) - Category: Health & Fitness, Lifestyle - Price: Free - Age rating: 4+ - Requires: iOS 13.0 · 19 MB - Languages: American English, Russian - Released: 2021-03-01 - Data updated: 2026-06-06 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/redcalendar-cycle-tracker/id1535523842/reviews.md ## What is RedCalendar? Try our cycle tracking app: analyze and predict menstruation, ovulation, and fertile days. We're not going to suggest that you evaluate mood shifts, drink water, or analyze your steps or hours slept, but you can enter any information about every day if you want to. The app is cloud-based: you don't need to worry about backups or iCloud space. If the need arises, RedCalendar will also work in airplane mode, so you can add your data and sync it later when you're back online. ANALYSIS AND PREDICT We use the median values of data you input to calculate your cycle. That's better using the average and more honest than talking about artificial intelligence. The app will adapt to you. And if you're prescribed pills to regulate an irregular cycle, enter what your new ideal cycle looks like in the settings and the app will remember them for 3 months. REMINDERS We send notifications at 9:00 and only about what matters: 2 days before your cycle starts, a day after the end of menstruation (if you forgot to mark it), and 4 days before your predicted ovulation. If you go on vacation, and your time zone changes, open the app, so we know. TAGS Use tags for giving additional info about the day. Just add one or more custom tags and track your workouts, emotions or new habits. Use the app every day as your personal dairy. PAYMENT AND SUBSCRIPTIONS The app is free to use and ad-free ## Key features - Menstruation prediction - Ovulation tracking - Fertile day identification - Customizable daily diary - Cloud-based data backup - Airplane mode functionality - Cycle analysis using median values ## Recent user reviews (6 of 6) All indexed reviews: https://appshunter.io/ios/app/redcalendar-cycle-tracker/id1535523842/reviews.md ### 5/5 — Лучшее *2025-08-08, version 2.2.2* Лучшее приложение для месячных которое у меня когда-либо было. Никакой рекламы, подписок и прочего, только самое необходимое. Плюс привязывается к номеру телефона что очень удобно. ### 5/5 — Приятное приложение *2025-05-05, version 2.2.0* Логотип топчик, внутри приложения все давольно просто ясно и понятно. ### 5/5 — Всё отлично! *2024-05-30, version 2.1.8* Почему мне раньше не попадалось это приложение? Спасибо, особенно за теги!🔖 ### 5/5 — Удобство в простоте! *2024-05-18, version 2.1.8* Ничего лишнего, все самое необходимое! Лаконичный дизайн, понятный интерфейс, особенно радуют напоминания о начале цикла :) Ждем версию для мужчин! ### 5/5 — Интересно и удобно *2022-10-20, version 2.1.4* Очень понравилось приложение, для женщин must have точно. ### 5/5 — Ничего лишнего *2021-07-23, version 1.0.4* Спасибо за приложение! Нравится простота и лаконичность) хотелось бы предложить, помимо счетчика дней на календаре, добавить возможность видеть все данные в простом отчете: даты цикла, длина цикла и длина менструации. ## Frequently asked questions about RedCalendar ### How does RedCalendar predict my cycle? RedCalendar uses the median values of your inputted data to calculate your cycle. This method is designed to be more accurate and honest than using averages or artificial intelligence. The app adapts to your personal cycle patterns over time. ### Can RedCalendar help with irregular cycles or medication? Yes, if you are prescribed pills to regulate an irregular cycle, you can enter your new ideal cycle in the settings. RedCalendar will remember these settings for 3 months to better predict your cycle. ### What kind of reminders does RedCalendar send? RedCalendar sends reminders at 9:00 AM. These include notifications for your cycle starting in 2 days, a day after your menstruation ends, and 4 days before your predicted ovulation. It also prompts you to open the app if your time zone changes, like during vacation. ### Does RedCalendar work offline? Yes, RedCalendar works in airplane mode. You can add your data while offline, and it will sync later when you are back online. This ensures you don't lose any entries, even without an internet connection. ### Is RedCalendar free to use? Yes, RedCalendar is free to use. The app is available for download at no cost, and it does not feature advertisements. ### What devices support RedCalendar? RedCalendar is supported on iPhone and iPod devices. It is designed for iOS users who want to track their menstrual cycles. ### How often is RedCalendar updated? The latest version of RedCalendar is 2.2.4, last updated on January 13, 2026. Updates typically include improvements to accuracy, new features, and bug fixes to enhance user experience. ### Does RedCalendar have ads? No, RedCalendar is ad-free. Users can enjoy a clean and uninterrupted experience while tracking their cycle and health data. ## Version history (last 5 releases) ### 2.2.4 — 2026-01-13 Fixed a tag synchronization bug that could prevent tags from displaying when transferring data to a new device. ### 2.2.3 — 2025-10-15 Bug fixes and stability improvements. ### 2.2.2 — 2025-06-18 Optimized app performance. Everything now works even faster and more stable. Added minor design improvements for more comfortable usage. Enhanced security and data protection. Your information is under reliable protection. Fixed minor issues for smoother app operation. This is an interim update before a major release. We're preparing lots of exciting features for you — stay tuned for updates! ### 2.2.0 — 2025-02-17 – Internal components updated – Improved authentication: call-based login is suggested if SMS doesn’t arrive – Increased stability and performance ### 2.1.8 — 2024-03-25 Now it’s easier to determine what day of the cycle is. Improved stability. ## Apps similar to RedCalendar | App | Rating | Price | Category | | --- | --- | --- | --- | | [Period Tracker Menstrual Cycle](https://appshunter.io/ios/app/period-tracker-menstrual-cycle/id6480318237) | 5.0 (11) | Free | Health & Fitness | | [Menstrual cycle tracker - Days](https://appshunter.io/ios/app/menstrual-cycle-tracker-days/id1621496253) | 4.5 (34) | Free | Health & Fitness | | [Woman App - period calendar](https://appshunter.io/ios/app/woman-app-period-calendar/id1389731716) | 4.8 (12) | Free | Health & Fitness | | [Period Cycle Tracker Lunation](https://appshunter.io/ios/app/period-cycle-tracker-lunation/id6447531740) | 4.6 (104) | Free | Health & Fitness | | [Lu Period Tracker, Ovulation](https://appshunter.io/ios/app/lu-period-tracker-ovulation/id6449603835) | 4.4 (69) | Free | Health & Fitness | | [Period Tracker - Cycle Log App](https://appshunter.io/ios/app/period-tracker-cycle-log-app/id6474762886) | 4.2 (10) | Free | Health & Fitness | ## More apps by Artem Bolotov - [TwinKey: Two-Factor Security](https://appshunter.io/ios/app/twinkey-two-factor-security/id6450484235) - [ScreenLines](https://appshunter.io/ios/app/screenlines/id6739783494) All apps by Artem Bolotov: https://appshunter.io/developer/901756576 --- *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 2026-06-06.*