The Commission has adopted today an Implementing Decision to support the setting up of a voluntary gateway service to facilitate the interoperability of contact tracing and warning apps. This consists in an interface to efficiently receive and make available relevant pseudonymised information from national contact tracing and warning apps in a secure manner between Member States deciding to make use of it. This will mean that citizens, in particular those traveling in the EU, will only need to install one app. The design of this service builds on the Interoperability guidelines, the set of technical specifications agreed between Member States and the Commission, the principles set out in the EU toolbox and the EU guidelines on data protection for apps. Interoperability is crucial, so that wide, voluntary take-up of national tracing and warning apps can support the relaxing of confinement measures and the lifting of restrictions of freedom of movement throughout the EU. At this stage, 10 apps have already been launched and 10 more are expected to become operational in the near future.