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Aim To perform a systematic review of available mHealth apps for menstrual cycle monitoring in Brazil. Methods A search for menstrual cycle mHealth apps from the Google Play Store and AppStore in Brazil was performed by two independent reviewers on October 2020, and the quality of eligible mHealth apps was assessed using the Mobile App Rating Scale (MARS). Results Our review identified 2400 potentially relevant mHealth apps, of which 56 were eligible for inclusion. The majority of the apps offered tools to track menstruation symptoms (63%) and educational content for users (32%). The mean ( ±SD) MARS app quality score for the 28 evaluated apps in Android was 3.5 ± 0.6 on a 0–5 scale. For the 28 evaluated apps in iOS, the mean app quality score was 3.8 ± 0.4. Most of the included apps, for both systems, scored average for credibility, user interface, and engagement. Conclusion The majority of available tools in Brazil are of moderate quality and limited functionality for menstrual cycle monitoring. This study highlights the top three mHealth apps available on each online store for individuals seeking menstrual cycle monitoring options.