Table 3.

Open-source software (OSS) contact tracing solutions deployed in Japan and Germany: source code publication and management approaches similarity extraction.

Identifying question	COCOAa (proximity tracing)	Corona-Warn-App (proximity tracing)	SORMASb (outbreak management)	Similarity
1. Source code published on a publicly accessible repository?	Yes (GitHub; English, Japanese) [27]	Yes (GitHub; English, German) [28]	Yes (GitHub; English) [29]	Yes (GitHub; English)
2. Source code accessible for public input, feedback, or interaction?	Yes (Process described in project ReadMe file hosted on GitHub) [30]	Yes (Process described in project ReadMe files [multiple] in separate folders hosted on GitHub) [28]	Yes (Process described in project ReadMe file hosted on GitHub) [31]	Yes (Project Read Me to guide users on the process to follow)
3. High level of independent or public source code customization possible as dictated by appropriate OSS license?	Yes (Process described in developer ReadMe file hosted on GitHub) [30]	Yes (Process described in developer ReadMe files [multiple] in separate folders hosted on GitHub) [28]	Yes (Process described in project ReadMe file hosted on GitHub) [31]	Yes (Project ReadMe to guide developers on the process to follow)
License	Free to customize (Mozilla Public License Version 2.0)	Free to customize (Apache License 2.0)	Free to customize (GNU GPL v.3)	Free to customize (choose license)

^aCOCOA: COVID-19 Contact-Confirming Application.

^bSORMAS: Surveillance Outbreak Response Management and Analysis System.