# PeakDay Fertility Tracker App — Period and Pregnancy Calendar > Fertility cycle tracker for period charting and natural family planning. (iPhone/iPad app by THE COUPLE TO COUPLE LEAGUE INTERNATIONAL, INC..) - Source: https://appshunter.io/ios/app/peakday-fertility-tracker-app/id1641958874 (this page in markdown: same URL + `.md`) - Developer: [THE COUPLE TO COUPLE LEAGUE INTERNATIONAL, INC.](https://appshunter.io/developer/1641959056) - Category: Health & Fitness - Price: Free with in-app purchases - Rating: 2.92/5 from 25 App Store ratings · 47 written reviews indexed - Age rating: 12+ - Requires: iOS 13.0 · 43 MB - Languages: English - Released: 2023-03-07 - Data updated: 2026-07-17 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/peakday-fertility-tracker-app/id1641958874/reviews.md ## What is PeakDay Fertility Tracker App? PeakDay is a fertility cycle tracker that can be used for period charting or to assist with the practice of natural family planning. To help figure out your peak fertility for pregnancy, you record your daily fertility signs or symptoms, like basal body temperature and cervical mucus. Couple to Couple League uses this app in CCL and LLP classes to learn the Sympto-Thermal method of NFP. PeakDay is your partner for a happier, healthier, smarter fertility. PeakDay can be used for free for women looking to simply track their period and chart their ovulation cycle. The PeakDay premium version allows women to chart their fertility cycles and log health information to help determine their fertility phase and situation. PeakDay provides you with an easy way to chart your cycle and connect with a community of fertility coaches to ask questions. You can also use PeakDay to share charts with a teacher or doctor. Charts and data can be accessed from multiple devices, so both husband and wife can be involved in charting and grow in fertility awareness. For more than 50 years, thousands of couples have learned NFP with CCL and trusted our algorithms to help them track and interpret their cycles to determine peak fertility. Now, we are using that same highly effective formula and algorithm behind PeakDay. It’s trusted and has a proven success rate for over 10,000 users (previous version known as CycleProGo app.) 10 Ways PeakDay can work for you: 1. Track your cycles. Easy to chart your menstrual cycle and ovulation by simply inputting your symptoms and signs each day. 2. Manage your fertility goals. You can naturally plan your family by using the fertility phase information to achieve pregnancy. 3. Predict the PeakDay of your fertility so that you can make sound fertility decisions. 4. Connect with our fertility community. Participating in the message boards and forums on PeakDay puts you in touch with fertility coaches for guidance and greater knowledge. 5. Share your charts and cycle history with real fertility coaches on the app or even connect your account to a fertility teacher. 6. Easy to use to practice NFP. PeakDay is fully compatible with CCL’s Sympto-Thermal method of Natural Family Planning and is used in both CCL and Liga de Pareja classes. 7. Custom tracking of over 60 fertility symptoms and signs. You can choose what you want to track daily by personalizing the settings. 8. Compare your personal cycle history. To better understand your body and fertility, you can keep cycle history which can help discover patterns in your cycles. The comparing tool allows you to look at 6 months of cycles and see your personal cycle statistics. 9. Learn about women’s health and grow in fertility awareness. Our online learning center is connected to PeakDay with videos explaining the basics about fertility, cycles and how biomarkers like mucus and temperature are important to fertility tracking. 10. Your data is in your hands. PeakDay is password protected and allows you to keep the account private or share your account with a spouse, a fertility expert or even with your doctor. Looking for a reliable and simple fertility ovulation tracker or health app for women? Download PeakDay today to make that happen. Visit Peakday.com for more information about pricing, subscription options and learning materials. To learn CCL’s STM NFP method, please visit www.ccli.org. If you are looking for a NFP class in Spanish, visit www.ligadepareja.org For fertility coaching and other programs, visit www.fertilityscienceinstitute.org If you are having technical issues or have any questions, we are here to support you. support@peakday.com For full Privacy Policy and our Terms of Service: https://peakday.com/terms/ Disclaimer: This tool should not be used for medical purposes or as a substitute for medical advice. Actual performance and results are not guaranteed. Use at your own risk. ## Key features - Period and ovulation charting - Natural family planning support - Sympto-Thermal method compatibility - Customizable symptom tracking - Community forums with fertility coaches - Chart sharing with teachers/doctors - Cycle history comparison ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Monthly | $9.99 | per month | | Yearly | $59.99 | per year | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Chart Review | $4.99 | one-time | ## Recent user reviews (10 of 47) All indexed reviews: https://appshunter.io/ios/app/peakday-fertility-tracker-app/id1641958874/reviews.md ### 1/5 — Super glitchy *2026-02-18, version 3.0.13* There are a few glitches with this app. This is not acceptable for an app that you have to pay for. This will not work for me. ### 1/5 — No longer allows data input after last update! *2026-02-17, version 3.0.13* After last update, (3 days ago), no data, other than temperature, can be entered. Please fix this! ### 1/5 — Really Wanted To Try *2025-11-05, version 3.0.10* I really wanted to try this app, but I couldn’t even get past signing up before it froze and wouldn’t let me continue. I put my name in and got to the date of my last period and it froze. Tried it 3 times and kept freezing in the same spot so unfortunately I deleted it. ### 2/5 — Terrible *2025-08-24, version 3.0.7* The app doesn’t regulate data like it should. I put in all the info it needs and it still says I’m fertile every day of the week. Don’t trust it, use a different platform like natural cycles ### 3/5 — I want to love it *2025-05-12, version 3.0.6* There is so much I like about this app. It has a beautiful, simple interface unlike others I have used. It’s supported by CCLI. It’s affordable. However, the Apple Watch syncing is clunky and a dealbreaker for me. For one thing, the Health app needs to be open at the same time in order for PeakDay to read the temperature. This doesn’t consistently happen even then. But the biggest dealbreaker is that there doesn’t seem to be a way to import past data. I have literally years of data from using other apps, and it would be too time consuming to input it manually. PeakDay has so much potential, I hope it advances technologically to be a contender with similar apps. ### 4/5 — Good app for NFP *2025-04-26, version 3.0.6* I’ve been using PeakDay with the subscription for the past couple years now. It’s a good, reliable app that helped me improve and analyze my monthly charts. I don’t have any issues with the app. My main feedback is to integrate Bluetooth connectivity to oral basal thermometers. I appreciate all the features of PeakDay, but would say this would be a significant user upgrade to consider for even more seamless charting. Thank you! ### 1/5 — Kicked me out *2025-03-04, version 3.0.5* I’ve been using this app and loving it, I’ve recommended it to loads of people. Recently I’ve gotten pregnant and have been using to it track my pregnancy symptoms. However, I just went onto the app and it has completely kicked me out. I’ve entered every email I have and it tells me every time that there are no accounts associated with my emails. Extremely frustrated and disappointed. Not planning on recommending this app anymore. ### 1/5 — Pay *2024-11-22, version 3.0.3* Ridiculous you need a membership ### 1/5 — App constantly crashes before sign up *2024-07-06* App unexpectedly crashes before I can sign up. What is the point. I’ve tried closing the app and restarting. I’ve updated my iOS, and nothing works. This app is just unusable. I found a different competitor app and I am using that one. ### 5/5 — Effective *2024-06-01, version 2.0.8* I love that this App is programmed to the Sympto-Thermal Rules of Natural Family Planning, so I know I am getting the highest effectiveness in avoiding a pregnancy right now. It uses my current symptoms to interpret my fertility rather than just relying on my cycle history like many fertility tracker apps. ## Frequently asked questions about PeakDay Fertility Tracker App ### What does the PeakDay Fertility Tracker app do? PeakDay is a fertility cycle tracker designed for period charting and natural family planning. It helps users predict their peak fertility days by recording daily fertility signs and symptoms like basal body temperature and cervical mucus. ### What are the key features of PeakDay? Key features include easy period and ovulation charting, support for the Sympto-Thermal method of Natural Family Planning, customizable tracking of over 60 fertility symptoms, community forums with fertility coaches, and the ability to share charts with teachers or doctors. ### Is PeakDay free to use? The app offers a free version for women who want to track their period and ovulation cycle. A premium version is available for more advanced charting of fertility cycles and logging of health information to determine fertility phases. ### What devices is PeakDay compatible with? The app allows charts and data to be accessed from multiple devices, enabling both partners to be involved in charting and fertility awareness. Specific operating system compatibility is not detailed but multi-device access is a core feature. ### How can PeakDay help with natural family planning? PeakDay is fully compatible with Couple to Couple League's (CCL) Sympto-Thermal method of Natural Family Planning. By tracking fertility signs and symptoms, users can gain fertility awareness and use the provided information to naturally plan their family or achieve pregnancy. ## Version history (last 5 releases) ### 3.0.18 — 2026-06-18 Bug fixes ### 3.0.17 — 2026-05-01 Bug fixes ### 3.0.16 — 2026-03-11 bug fixes ### 3.0.15 — 2026-02-26 Bug fixes ### 3.0.14 — 2026-02-18 Bug fixes ## Apps similar to PeakDay Fertility Tracker App | App | Rating | Price | Category | | --- | --- | --- | --- | | [Premom-Ovulation Tracker, PCOS](https://appshunter.io/ios/app/premom-ovulation-tracker-pcos/id1279295922) | 4.8 (57,333) | Free | Health & Fitness | | [Flo Cycle & Period Tracker](https://appshunter.io/ios/app/flo-cycle-and-period-tracker/id1038369065) | 4.7 (1,918,774) | Free | Health & Fitness | | [Period Tracker Period Calendar](https://appshunter.io/ios/app/period-tracker-period-calendar/id896501514) | 4.9 (170,444) | Free | Health & Fitness | | [Clue Period & Cycle Tracker](https://appshunter.io/ios/app/clue-period-and-cycle-tracker/id657189652) | 4.8 (399,256) | Free | Health & Fitness | | [Period Tracker & Ovulation App](https://appshunter.io/ios/app/period-tracker-and-ovulation-app/id1469249201) | 4.6 (3,360) | Free | Health & Fitness | | [Cycle Tracker & Period: Cycles](https://appshunter.io/ios/app/cycle-tracker-and-period-cycles/id577187307) | 4.7 (26,268) | Free | Health & Fitness | ## More apps by THE COUPLE TO COUPLE LEAGUE INTERNATIONAL, INC. - [CycleProGo](https://appshunter.io/ios/app/cycleprogo/id615146496) All apps by THE COUPLE TO COUPLE LEAGUE INTERNATIONAL, INC.: https://appshunter.io/developer/1641959056 ## Related topics [peakday fertility tracker app](https://appshunter.io/ios/topics/peakday-fertility-tracker-app) --- *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 2026-07-17.*