This study looks at how satisfied customers in the Thoothukudi district area are using financial technology mobile payment apps.  Analyzing user impressions of usability, transaction speed, reliability, safety, and general satisfaction was the main aim.  A structured questionnaire was used to gather data from 160 respondents, and ANOVA and Chi-square tests were used for analysis.  While most other service-related elements, such security, interface, and processing correctness, did not exhibit significant variation among responder groups, the test findings showed that user opinion varied considerably for criteria like convenience and customer assistance.  According to the Chi-square test, there is no discernible correlation between gender and the most favored FinTech mobile app, indicating that male and female users' adoption habits are comparable. Overall, the findings indicate a high level of acceptance and satisfaction with financial technology payment platforms, although improvements are required in customer service and clarity of charges. The study concludes that FinTech applications play a vital role in promoting cashless digital transactions and have become an integral part of everyday financial activities.