Period Tracker Flo app

An app to help you track your menstrual cycle (periods).

Period Tracker Flo By OWHealth Inc
  • Period tracker
  • Period cycle predictions
  • Ovulation calculator
  • Pregnancy calculator
  • Reminders
  • Graphs
  • Education and information 

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Security and privacy Does the app:
  • collect medical information? Yes
  • require a login? No
  • have password protection? Yes
  • have a privacy policy? Yes
  • require internet access? Yes
Read more safety tips around health apps.
Cost Free (cost for Premium $54.99/year or $10.99/month) 

What does the app do?

The app has 3 main purposes: to track your period cycle if you don't plan to get pregnant soon, predict your fertile window if you are trying to conceive and track your pregnancy if you are pregnant. The app can track many symptoms and lifestyle measures applicable to the purpose selected. Based on the data you enter, the app's predictions of your cycle and ovulation improves. The Health Insights help you to learn more about your body and cycle, and it also provides personalised health insights each day.

For the complete app description, go to App website  , Google Play or  iTunes and, for a detailed review, see Reviews


✔ Useful health information including advice on managing menstrual pain, heavy menstrual bleeding, diet/exercise around menstruation and other relevant information.

✔ Has an alert if your period is late.

✔ Has both menstrual (period) and pregnancy tracking modes.

✔ Has a calendar and graphing.

✔ Monitor menstrual (period) flow, libido (desire for sex), mood, menstrual symptoms and other factors influencing the cycle.

✔ Allows monitoring of predicted ovulation using calculations, vaginal discharge and basal temperature.

✔ Can sync with fitness wearables and other health and fitness apps.

✔ You can join the Flo community board to ask questions or make comments.

✔ Reminders for contraceptive pills, Depo Provera injections and others.

✔ Option to password protect account.

✘ Does not alert user if emergency contraception should be considered (eg, if you’ve indicated that you don’t want to get pregnant, and then log that you had unprotected sex during your fertile period).

✘ The majority of special features (including predictions and written content) are only available to Premium users.

✘ No option to sync to your partner's device.

✘ This app has push notifications, with limited ability to tailor the content of these.

Privacy and security

The app has a privacy policy and terms of service disclosure. The privacy policy outlines the personal data the app collects, together with the information that is collected automatically. It also describes how your data will be used, including sharing with third party providers (for example, "to customize product service and offerings and recommendations to you, including third-party products and offerings). The app does not have a default password protection, but users can choose to secure access with a 4-digit security code. Read more about things you can do to improve your safety and security when using apps.   

Review details

  • February 2021, Version 5.10.0, Android
  • July 2018, Version 4.6.7, Android


  1. Moglia ML, Nguyen HV, Chyjek K, et al. Evaluation of Smartphone Menstrual Cycle Tracking Applications Using an Adapted APPLICATIONS Scoring System. Obstet Gynecol. 2016 Jun;127(6):1153-60
  2. Lee NB, Kang JH, Agapie E, et al. Examining Menstrual Tracking to Inform the Design of Personal Informatics Tools. Proc SIGCHI Conf Hum Factor Comput Syst. 2017 May 2;2017:6876-6888. 

Disclaimer: Health Navigator’s app library is a free consumer service to help you decide whether a health app would be suitable for you. Our review process is independent. We have no relationship with the app developers or companies and no responsibility for the service they provide. This means that if you have an issue with one of the apps we have reviewed, you will need to contact the app developer or company directly.

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Credits: Health Navigator Editorial Team. Reviewed By: Dr Arna Letica, GP Last reviewed: 16 Feb 2021