This research aimed to develop seamless mobile android project-based learning to improve student performance. This paper uses the Ghirardini development prototypical and the Information Management Resource Kit (IMARK) (2011). The data analysis used is descriptive quantitative research. The results show: (1) the validation of the media experts have value 87%, and this is included in the very valid criteria; (2) the validation results of the material experts have value 89% and include into the criteria very valid; (3) the outcomes of the validation of the learning expert have value 89% and was included in the very valid criteria; and (4) the results of the practicality test presented that the practicality value of the small group reached 85% and the large group reached 84%, and those percentages are included in the criteria of practicality level is quite valid; (5) the results of the effectiveness test obtained a sig value of 0.000 < 0.05 so that it can be interpreted that there is a significant effect on student performance. © 2020 IEEE.

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