Background CareMOBI (mhealth for Organization to Bolster Interconnectedness) is a user-centered mobile application that supports secure communication between adult day health centers, primary care providers, and family caregivers. The aim of this study was to examine the acceptability of CareMOBI in the primary care setting and identify factors contributing to the likelihood of adoption among primary care providers. Methods We used a mixed-methods concurrent triangulation design. We, first, collected quantitative data using the Technology Acceptance Model questionnaire. Follow-up interview questions allowed participants to elaborate on their experience interacting with CareMOBI. We developed an informational matrix based on major themes within the Technology Acceptance Model (ease of use, value in clinical care, fit within existing workflows, and likelihood of adoption) in which qualitative data were embedded and compared. Results Our sample included 10 primary care providers. Participants rated CareMOBI high in ease of use ( M = 6.71 out of 7), value in clinical care ( M = 6.79), and likelihood of adoption ( M = 6.71). They found specific functions of CareMOBI helpful, including the summary of health progress and the patient profile. In contrast, participants reported the lowest score for the fit of CareMOBI within existing workflows ( M = 5.52). Qualitative feedback attributed this score to concerns over the lack of interoperability between CareMOBI in its current form and electronic health record systems used in the primary care setting. Conclusion Providers found CareMOBI valuable and easy to use, and there was a high likelihood of eventual adoption. However, apprehensions regarding workflow and electronic health records integration arose, which the team will have to consider as they move forward to the next phase of the application's development.