Use of Menstruation Tracking Apps Among Women: A Systematic Review and Meta-Analysis of Multi-Country Evidence.

Background: Menstruation-tracking applications have become common digital tools for cycle monitoring, symptom tracking, fertility-related decisions, and reproductive self-awareness. Despite their growing use, evidence on their uptake and real-world use across settings has remained fragmented. This study aimed to systematically review and synthesise evidence on the use of menstruation-tracking apps among women, including uptake, reasons for use, benefits, determinants, concerns about accuracy, and privacy. Methodology: A systematic review and meta-analysis of published studies was conducted in PubMed, Scopus, and Web of Science. Eligible studies involved adolescent girls or women and reported use of menstruation or fertility-tracking apps. Data were extracted independently. All included studies were synthesised narratively, while a random-effects meta-analysis of proportions was performed for six studies reporting extractable prevalence data. Heterogeneity was assessed with I Results: Fourteen studies published between 2017 and 2025, involving 3,547 participants, were included, with six contributing to the meta-analysis. The pooled prevalence of menstruation-tracking app use was 61% (95% CI: 45%-75%), although substantial heterogeneity (I Conclusion: Menstruation-tracking app use appears common in the studied populations, but available estimates vary widely, and the certainty of evidence is very low. These apps may support self-monitoring and reproductive awareness, but they should be used as adjunctive self-management tools rather than stand-alone clinical tools.