Welcome Health Professionals,
Help patients track their menstrual cycles & know their pregnancy risks with Dot's proprietary technology.

The Dot™ fertility tracker allows a user to prevent or plan pregnancy by tracking period-start dates. Dot has been tested to be 95% effective with typical use for preventing pregnancy and 99% effective with perfect use. Developed by Cycle Technologies, this advanced technology is based on a fertility awareness method called Dynamic Optimal Timing™​.  The Dot app uses statistical analysis and evidence-based information about fertility during the menstrual cycle to calculate a user’s unique pregnancy chances for each day of her cycle.  

Dot's algorithm uses data science to accurately determine pregnancy risk. It can be used to prevent pregnancy, plan pregnancy, or to track. 

Who can use Dot?


For pregnancy prevention, the medical criteria for Dot are that the user have cycle lengths in a range of 20 to 40 days and cycle variation of less than ten days.  Most women have cycles that meet these criteria.  When preventing pregnancy, Dot users are advised to manage their High-risk days by either using an effective barrier method or not having sex on those days. For planning pregnancy, Dot works best for users with the same cycle criteria.  Anyone can use Dot to track cycles.


How effective is Dot?

When used correctly, Dot is 99% effective at preventing unintended pregnancy. With typical use, Dot is 95% effective.  Dot has undergone a full-scale, efficacy trial conducted by the Institute for Reproductive Health at Georgetown University with support from the United Stated Agency for International Developemnt (USAID). Results were published on March 18, 2019, in The European Journal of Contraception & Reproductive Health Care.

How does Dot work?

Dot works through an algorithm that takes large amounts of known, vetted fertility data and the user's own cycle lengths and cycle pattern to determine the percentage pregnancy risk for each day of the current cycle. A user can begin using Dot for contraception or conception as soon as they download the app and enter a period-start date. Initially, Dot flags High-risk days very conservatively, identifying sixteen days as potentially fertile. As more period dates are entered, Dot refines its calculations and narrows a user’s potential fertile window.

To use Dot,

  • The user downloads the Dot app, then enters the start date of their most recent period.

  • Dot tells a user whether their pregnancy risk is High, Medium, or Low each day.* 

  • For achieving pregnancy, Dot recommends having sex on days flagged as High and Medium chance.

  • For preventing pregnancy, Dot recommends using an effective barrier method or avoiding sex on High-risk days.  The withdrawal method is not recommended on High-risk days.

    * Dot flags days as High, Medium and Low chance for users who are planning pregnancy or tracking cycles.  Dot flags days as either High or Low risk for users who are preventing pregnancy.

How is Dot is different?

The two key ways in which Dot is different from other fertility and period-tracking apps are that Dot was designed primarily to be used as contraception, and the only input required from the user is the period-start date each cycle.  Dot was developed by Cycle Technologies in collarboration with reproductive health experts and data scientists to ensure the Dot was highly effective in preventing pregnancy and very easy to use for the end user.

And because Dot is accurate for pregnancy prevention, the information is also very accurate for those wishing to use it when trying to conceive.



  • Effective in preventing pregnancy.

  • Is very easy to use, which helps ensure correct and consistent use.

  • Provides personalized estimation of the fertile window.

  • Can be used both as contraception and for conception purposes.

  • Meets the need for a non-hormonal, side effect-free contraceptive option.

  • Facilitates understanding of the user’s body and menstrual cycles.

  • Can help alert a user to potential underlying health conditions through monitoring of cycle pattern.

  • Cycle history information can be shared easily with the healthcare provider.

  • Assists providers in offering a client-centered approach to counseling.



  • Less effective in typical use than LARCs in preventing pregnancy.

  • Does not protect against STIs, including HIV. Condoms are the only option that protects against STIs and HIV.

  • A couple must be willing to use protection or not have sex on high-risk days.