Mobile health technology offers promising means to implement public health strategies for prevention and management of chronic conditions. However at the moment there is a dearth of both; specific mobile health tools tailored for the knowledge and language needs of Indian population; as well as enough systematic and scientific clinical data to analyse their impact in varied Indian socioeconomic and disease populations.To develop and pilot test a smartphone based bilingual educational mobile app for heart patients in an Indian clinical setting.An Android™ based mobile app was developed according to systematic instructional design model. Thereafter expert assessment was done by 3 software engineers and 2 healthcare professionals using a peer-reviewed, objective, multidimensional Mobile Application Rating Scale (MARS). A pilot user satisfaction evaluation was done based on feedback from 35 coronary artery disease (CAD) patients visiting Cardiology outpatient department of a North Indian tertiary care center.An Android™ based mobile application named as 'Happy Heart' was developed. The content was developed in both Hindi and English under professional supervision. For this mobile application the Mean MARS score was 3.60 ± 0.86 and subjectivity score was 3.30 ± 1.03. The overall user satisfaction response was 4.09 ± 0.75 indicating that most of the test users found it useful.This mobile application is developed as a research tool to further conduct a clinical study in coronary artery disease patients. Current evaluation was a pilot testing wherein this application showed promising results.