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. 2021 Mar 26;7(3):e25859. doi: 10.2196/25859

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©Thomas Foster Scherr, Jenna Maria DeSousa, Carson Paige Moore, Austin Hardcastle, David Wilson Wright. Originally published in JMIR Public Health and Surveillance (http://publichealth.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 Public Health and Surveillance, is properly cited. The complete bibliographic information, a link to the original publication on http://publichealth.jmir.org, as well as this copyright and license information must be included.

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Use of the MyCOVIDKey app by (top) time of day and (bottom) day of week. Time of day is user local time (CST). Total values for reference: 814 logins, 227 screenings, and 1410 key-ins.