Background: During this COVID-19 pandemic, service that provides online health consultation such as online doctor application has become popular in public. The quality of health service is an important thing that needs to be considered because there are still skepticism and a lot of user negative reviews regarding the quality of online health service. Methods: This study is a correlative analytical observational study with a cross sectional study design. 120 respondents were obtained with purposive sampling techniques. The instrument is Telehealth Usability Questionnaire (TUQ) translated into Indonesian and validated through pre-test. The correlation between the variables was analyzed using Chi-Square correlation test. Results: X with the largest number of users (42.5%) has the best quality of users patient health service, followed by Y in terms of the number of users (37.5%) and the quality of users patient health service, and Z in terms of the number of users (20%) and the quality of users patient health service. The results of the Chi-Square correlation test showed p=0.012 (<0.05), means that there is a significant correlation between online doctor application and usability indicator, p=0.228 0.097 0.180 0.494 0.231 (≥0.05), means that there are no significant correlation between online doctor application and ease of use and learnability interface quality interaction quality reliability and satisfaction and future use indicators, p=0.044 (<0.05), means that there is a significant correlation between online doctor application and the quality of users patient health service. Conclusion: X with the largest number of users has the best quality of users patient health service, followed by Y and Z. There is a correlation between online doctor application and usability indicator. There are no correlation between online doctor application and ease of use and learnability interface quality interaction quality reliability and satisfaction and future use indicators. There is a correlation between online doctor application and the quality of users patient health service.