Pixabay is the most valuable free alternative to commercial stock photo sites. The Pixabay mobile app includes the following features:

* Fast search and a user-friendly interface
* Swipe through search results
* One-click image viewer - optimized with zooming and panning for smaller screens
* Directly download and share images in all sizes
* Messages and comments allow you to connect with others
* Images can be liked, favorited, and easily managed within the app

Planned features for the next app version:

* Direct image uploads from your device
* Show tags and camera info for all images
* Manage your own uploads