Bom Calendar - Period tracker

Contains adsIn-app purchases
4.3
28.1K reviews
500K+
Downloads
Content rating
Teen
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About this app

- Bom Calendar, a unique period tracker you can customize
Get consistent with Bom Calendar! It’s the app you will want to see daily. Ever wondered when your next period will be? What about the chances of pregnancy? How about sexual interactions? Get the answers you want at any time with Bom Calendar. Customize everything from the calendar display, calendar scroll direction, visibility – all to your preference!

- Period, Schedule, To-Do List: All in One App
Accurate period tracking starts here. Add and manage your schedule and to-do-list with just one tap. Get notifications to keep up with your schedule, lunar calendar, and holidays. Save time and make your day more efficient with Bom Calendar.

- Accurate Pregnancy Probability and Period Cycle Estimation
Did you know only 6% of period tracker apps could accurately predict periods? Bom Calendar uses the same standard contraceptive guidelines and period calculation methods used by the American Board of OBGYN for a more accurate pregnancy probability and cycle prediction.
Learn how to nurture your body. Bom Calendar tracks the female hormones that change daily to let you know what your mood is, your energy level, memory, focus, comprehension, cravings and more.

- Daily Updates About My Body condition
Let Bom Calendar help! Learn about the symptoms and causes of common illnesses for women and how to respond to them.

- My Special Doctor Keeping Up With My Health
It's easy to let your health slip with your busy day-to-day life. No more worries. With Bom Calendar, you can learn about the symptoms and causes of common illnesses for women and how to respond to them.

- Pregnancy Mode for Health Baby
Get weekly updates on the baby's size, the different changes in you and your baby and tips on what to do. Bom Calendar will support you until your baby comes.

- Easy Weight Tracking
No more complicated weight trackers! Simply enter your weight, and the app will show you the healthy weight range and BMI. Achieve your weight goals with Bom Calendar!

- Keep My Data More Securely and Conveniently
Use your email, Google, Facebook or Apple accounts for an easy, fast sign-up process. We keep your user data safe on our secure server with an auto-backup/restore function even if you change your phone or reinstall our app.

- Share Your Calendar with a Special Someone
Share your calendar to securely and easily share your days. You can customize what information you want to send and when important information is updated.

[Premium]
- You can share your mood and health status with your friends.
- Try a cleaner look without the ads.
- You can simultaneously Sign in to our service from your smartphones and tablets.
- Future additions to the Premium features will also be available at no extra cost.

Privacy policy : https://bomcomes.com/bomcalendar/en/privacy.html
Terms of service : https://bomcomes.com/bomcalendar/en/terms.html
https://support.google.com/googleplay/answer/7018481

For questions or issues while using Bom Calendar, please email help@bomcomes.com ◕‿◕

Bom Calendar used the following sources to provide you with accurate period estimation.
- Kippley, John and Sheila Kippley. The Art of Natural Family Planning. The Couple to Couple League, Cincinnati, OH: 1996.
- Hatcher, RA; Trussel J, Stewart F, et al (2000). 《Contraceptive Technology》New York: Ardent Media.
- ACOG Patient Brochure 049.
- Acog Patient brochure: midlife transition and menopause
- ACOG Medical Student Education Module 2008
- Comprehensive Gynecology. Mishell, Stenchever, Droegemueller, and Herbst. 3rd Edition.
- Textbook of Histology. Bloom and Fawcett 11th edition.
- Emans Laufer and Goldstein Pediatric and Adolescent Gynecology
- ACOG by American congress of obstetricians and gynecologist
Updated on
Aug 4, 2025

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
App info and performance
This app may collect these data types
Personal info, Financial info and 5 others
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

4.3
27.8K reviews
Fateme Tabrizi
April 14, 2025
This is the best period tracker I've ever used! It's fast, and it's widget along with the day-section animations are absolutely beautiful. If possible, please consider adding Saturday as an option for the first day of the week in settings. thanks!
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Nova Lachlan
October 11, 2023
Some of the descriptions can be a bit confusing, but it has a lot of information and it's very cute. I like that you can customize the visuals and it's not heavily feminine - it makes it more accessible for transmasculine users. It does like to judge you on your bmi though. Apparently I am "obesity". I beg to differ.
3 people found this review helpful
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FK Device
August 25, 2023
I really like it! I chose it over many other period apps. This UI is more clean and smooth. There are no intrusive ads, no annoying premium ads, and no paid article section forced onto me. I like the calender design, customization options, and custom note (memo) option. Lots of notification options, which is great, but I wish we could customize the notification text. I also wish the symptoms we input can be shown in a vertical bullet list instead of in a sentence (a list is easier to read!)
3 people found this review helpful
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What’s new

- Combined "Period" and "Weight" into a single "Health" tab.
- Fixed minor issues and enhanced app usability.