Help patients plan + prevent pregnancy and track menstrual cycles with Dot's advanced patent-pending technology

The Dot™ fertility tracker allows a user to prevent or plan pregnancy by tracking period-start dates. Developed by Cycle Technologies, this proprietary contraceptive technology is based on a fertility awareness method called Dynamic Optimal Timing™​.  The Dot app uses data science, 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 and can be used for birth control and for pregnancy planning.

Advanced fertility technology can be used by anyone anywhere with a regular menstrual cycle between 20-40 days*

A user can begin using Dot for contraception or conception right from the beginning.

Who can use Dot?


Dot can be used by anyone to track their periods or for pregnancy planning. For women using Dot to prevent pregnancy, the medical criterion requires that users have cycles between 20-40 days long with fewer than 10 days of variation in cycle length. When preventing pregnancy, Dot users are advised to manage their potentially fertile days by either using a barrier method or not having sex on High-risk days. 

How does Dot work?

A user can begin using Dot for contraception or conception right from the beginning. Initially, Dot flags High-risk days very conservatively, identifying sixteen days as potentially fertile for those preventing pregnancy. As more period dates are entered, Dot refines its calculations and narrows a user’s potential fertile window.

To use Dot,

  • A user enters the start date of her most recent period.

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

  • If using Dot for achieving pregnancy Dot recommends having sex on days flagged as High or Medium risk

  • If using Dot to prevent a pregnancy Dot recommends using a barrier method or avoiding sex on High risk days.

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

How is Dot is different?

Dot was designed by reproductive health experts and data scientists to be both highly effective and easy to use. Dot’s advanced algorithm has been rigorously tested and found to provide users with accurate information that will help them meet their reproductive goals.  Because it relies only on period tracking, research shows that users are able to use Dot correctly and consistently.

How effective is Dot?

Dot is designed to accurately identify a user’s chances for pregnancy each day of her cycle. It can be used as an effective contraceptive method.  Dot is currently undergoing a prospective efficacy trial. Mid-trial results indicate Dot is highly effective in both typical use and perfect use. 



  • Effective in preventing pregnancy.  99% effective with correct use; 95% effective with typical use.

  • 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 interest in 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 cycles lengths 

  • 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 at preventing pregnancy 

  • Does not protect against STIs or 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