App use
We measured the numbers of logins among intervention participants using Pfizer analytics tools. In the follow‐up survey, intervention group participants were asked to rate the usefulness of the app overall, and of individual function on a 1 to 5 scale (1 = Never used, 2 = Not at all useful, to 5 = Very Useful). Structured questions about specific reasons they used and did not use the app were asked using a 1 to 4 scale (1 = Strongly Disagree, to 4 = Strongly Agree). The survey also allowed for free‐text feedback from participants regarding the reasons they used the app and concerns with using the app.