Table 1.

List of web-based COVID-19 symptom checkers included in this study.

Name	Reference
Ada	[13]
Apple	[14]
Babylon	[15]
CDCa	[16]
Cleveland Clinic	[17]
Docyet	[18]
Infermedica	[19]
Providence	[20]
Symptoma	[21]
Your.MD	[22]

^aCDC: US Centers for Disease Control and Prevention.