Objective: to evaluate the semantics, appearance and usability of the mobile application “Descomplicando a Amamentação” for family members of newborns. Method: applied methodological study, developed with 20 family members of newborns users of educational technology, including pregnant women, postpartum women and family members of newborns. An evaluation instrument containing questions about semantics and appearance was applied, in addition to the System Usability Scale to evaluate usability. In data analysis, the Agreement Index was used, with a cutoff point of 0.8 (80%). Results: when evaluating semantics and appearance, the application achieved a Global Agreement Index of 0.99 (99%), varying from 0.95 (95%) to 1.0 (100%) between the items evaluated. In usability, a global average of 93 was achieved, presenting the best usability achievable in all system characteristics. Conclusion: the technology was considered understandable, relevant, and efficient, as well as easy to use and low inconsistency with high user satisfaction, demonstrating excellent potential for families.