The research aims to determine how the Unified Mobile Application for New-Age Governance UMANG’s e-governance capabilities contributes to sustainable development by analysing the effects of the app’s features on users’ happiness. In order to facilitate sustainable development via user empowerment, a well-structured questionnaire was developed to document the advantages of the UMANG Application and its effect on user satisfaction. The dependability of the survey was confirmed using the Gaskins master validity table, and the validity of the questionnaire was reviewed by specialists. In addition, the results of the SEM model study show that the direct benefit aspects of UMANG have a favourable and substantial effect on user satisfaction, which contributes to sustainable development. Standardised estimations show that UMANG advantages significantly boost user happiness, which in turn has a huge influence on sustainable development.