Sample App SDK

Yes, we do. Here are a couple of sample apps:
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For Android Studio: https://github.com/appodeal/appodeal-android-demo

For XCode: https://github.com/appodeal/appodeal-ios-demo

For Unity: you can find the Demo scene into the plugin in the Assets/Appodeal/AppodealDemo folder after import of the Appodeal plugin.