Table 1.

Pros and cons of a mobile app and a device-responsive website.

Feature	App pro/con	Website pro/con
Accessibility from a portable device	Easily accessible through an icon.	Requires the user to save the bookmark on the home screen.
Notifications (eg, to repeat the questionnaire)	Available also while not using the app.	Only available while using the website or though emails/text messages.
Offline questionnaire completion	Connection required only to download and submit the questionnaire. Completion can happen offline.	Not accessible offline.
Leveraging smartphone features (eg, step count or camera)	Easier to achieve.	Harder to achieve.
General accessibility	Only accessible through a portable device. Specific operating system versions needed (eg, iOS and Android).	Accessible through a browser from a computer and a portable device.
Costs for development, maintenance, and update	In our case, a website was needed, so costs for the app would be added on top of website expenses.	Not having a website was not an option for the investigators.