Duane, M., Contreras, A., Jensen, E. T., & White, A. (2016). The Performance of Fertility Awareness-based Method Apps Marketed to Avoid Pregnancy. Journal of the American Board of Family Medicine : JABFM, 29(4), 508–511.
Key Results
Of those reviewed, 30 apps predicted days of fertility for the user and 10 did not.
Conclusion
Relying solely on an FABM app may not be sufficient to prevent pregnancy.