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. 2021 Mar 26;5(3):e27882. doi: 10.2196/27882

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©Britt Elise Bente, Jan Willem Jaap Roderick van 't Klooster, Maud Annemarie Schreijer, Lea Berkemeier, Joris Elmar van Gend, Peter Jan Hendrik Slijkhuis, Saskia Marion Kelders, Julia Elisabeth Wilhelmina Cornelia van Gemert-Pijnen. Originally published in JMIR Formative Research (http://formative.jmir.org), 26.03.2021.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR Formative Research, is properly cited. The complete bibliographic information, a link to the original publication on http://formative.jmir.org, as well as this copyright and license information must be included.

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The app’s home screen, which appears after the user has finished the onboarding and activation of the app. At the top (1), the app explains its activation for use. Below this are several information pages on (2) how the app works (frequently asked questions), (3) what to do if one receives a notification, (4) how to request a COVID-19 test, and (5) how to share one’s key.