The Pixabay API provides free access to Pixabay's 1.2M outstanding CC0 images and videos. The API is completely free - it's simple to set up, can handle any volume of requests and is stable+reliable. All of Pixabay's official apps are powered by the API, including our iOS and Android mobile apps.
Hyperion is an in-app design review tool to inspect measurements, attributes, and animations. Hyperion is open source and sits on top of plugins, allowing you to add your own plugins and customize your toolset.
Hyperion for iOS is live on GitHub, Android forthcoming.
If you're looking for image datasets to use with this, check out https://www.producthunt.com/posts/download-image-datasets