PeakDay Fertility Tracker 12+

Ovulation, Period & Pregnancy

Couple to Couple League

Designed for iPhone

    • 4.0 • 8 Ratings
    • Free
    • Offers In-App Purchases

iPhone Screenshots


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 for more information about pricing, subscription options and learning materials.

To learn CCL’s STM NFP method, please visit If you are looking for a NFP class in Spanish, visit For fertility coaching and other programs, visit

If you are having technical issues or have any questions, we are here to support you.

For full Privacy Policy and our Terms of Service:

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.

What’s New

Version 2.0.6

Bug fixes

Ratings and Reviews

4.0 out of 5
8 Ratings

8 Ratings

ebthelen ,

Like the new features

It seems that the bugs have been worked out and I am now loving all the features. The compare button to look at multiple cycles is useful. It is easy to see all the information displayed on my chart. If it continues to work as it has in the last few days it will be a five star app.

Developer Response ,

Thanks so much for your feedback! Please contact if you have any issues in the future.

KTinDen ,

Big help with cycles and great support

This really helped me understand my cycles--could even share charts with my doctor. I took the class and that really provided more information including nutrition and help from a coach. Easy and effective!

xoxolita sad face ,

So glitchy it’s nearly unusable

I have to login every time I use it and it never remembers my password, so once I’m done logging in for 2 minutes every day, it still doesn’t work.

I entered the days of my period and it marked that as “fertile days” ??? Not sure how that makes any sense. Then it made my WHOLE menstrual cycle “phase 2” and fertile. It’s unusable unfortunately. I really wanted this to work.

Developer Response ,

Dear valued customer, We are sorry to hear about your difficulties with the app. Please reach out to ​ so we can get these issues resolved. For privacy and security, there is a checkbox that says "remember me" and if you haven't done that—it will make a difference. The rules of this method are in the app's FAQs and yes, everyone's first cycle starts with "phase 2 - fertile" because we can't tell where you might start in your cycle. The app is looking for an ovulation to be able to declare that you are in Phase 3 and then it will be able to declare Phase 1- Infertile after that. For this reason, you have 60 days of free trial, so you can get through one full cycle plus. Again, there are specific rules which the method uses and our support team is very willing to work with you so the app can serve you well. Please get in touch.

App Privacy

The developer, Couple to Couple League, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Linked to You

The following data may be collected and linked to your identity:

  • Health & Fitness
  • Purchases
  • Contact Info
  • User Content
  • Identifiers
  • Usage Data
  • Sensitive Info
  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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