The Photonics4All-App is one of the tools developed within the Photonics4All outreach program. This is the dutch version of the App. This App has mostly been developed to address young people (via their smartphones and tablets). It was also used for promotion of photonics for the large public (the young people’s parents to start with). The main objective of the App is to provide basic knowledge on photonics through interactive and fun games/activities included in the App. The Photonics4All-App contains five different modules: • Module 1: Basics Photonics concepts • Module 2 : Photonics for ICT • Module 3 : Photonics for Health & life science • Module 4 : Photonics for Energy, lighting and display • Module 5 : Photonics for Security, Metrology and sensors Each module contains many chapters. Each chapter consists of explaining a specific concept and is organized in 3 steps: - Understand: In this step, the concept is explained as simply as possible. - Experiment: In this step, simulations or animations are used in order to experiment the concept. - Quiz: In this step, youth or students will test whether they understand the concept or not (3 questions maximum) Opticsvalley will take into account user’s feedback, so the tool will be evaluative and adapted to the real needs of young people.