As of 1 July 2021, 24 EU/Schengen countries have developed or endorsed contact-tracing apps to fight the pandemic (see Figure 2). The great majority of these apps are based on a decentralised architecture (not involving a central server for matching users’ anonymised data), which enables them to become interoperable using the EU gateway.
Number of contact tracing apps developed/endorsed by EU/Schengen countries
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