Yivi is a Dutch digital identity app, available from the App Store, Google Play and F-Droid. Users keep identity attributes on their phone and share only the data a service requires, for example proof of being over 18 without revealing a date of birth. The website describes the software as fully open source under the Apache 2.0 and GPL 3.0 licences. It is delivered as a mobile app, and the site does not mention a self-hosted server or a hosted service offering.
The brand is held by Stichting Privacy by Design, an independent Dutch foundation without shareholders. Caesar Groep Rotterdam B.V. develops and manages Yivi under a contract that requires it to remain open source, and Yivi B.V. in Utrecht is the operating company. According to the website, personal data stays on the phone and the infrastructure is hosted in the Netherlands and the EU, currently in Amsterdam. The code is public, so organisations can review it directly. The privacy policy does not reference the GDPR, which a European organisation should weigh when assessing the service.