The app shows you a series of smileys.

The images used in this app are from the website

"pixabay - Impressive free & royalty-free images
More than a million high-quality stock images and videos; shared by our talented community."

What can you do with the content?

Subject to the prohibited uses (see below), the following uses are permitted under the Content License:
* Use content for free
* Use content without crediting the author (however, crediting the author is highly valued in our community!)
* Modify or adapt content for new works

Full License:
https://pixabay.com/de/service/terms/