Create an app open ad unit

App open ad units appear when the user opens your app or switches back to your app. App open ad units appear on the loading or splash screen. 

App open ad units currently only show text, image, rich media, and video ads. 

To create an app open ad unit follow these steps:

1. Sign in to your AdMob account at https://admob.google.com.
2. Click Apps in the sidebar.
3. Select the name of the app you're creating this ad unit for. If you can't find it in the list of recent apps, you can click Add app to add a new app or click View all apps to search a list of all of the apps you've added to AdMob.
4. Click Ad units in the sidebar.
5. Click Get started. If you've already created ad units for this app, click Add ad unit. 
6. Click Select for the app open ad format.

7. Enter a name for this ad unit. Tip: Include relevant information, such as ad format and location in your app to make it easier to identify later.

8. (optional) Complete the advanced settings for this ad unit:
   • Ad type: Choose the ad type(s) allowed to be shown in this ad unit. The only ad type available for app open is text, image, rich media, and video ads. 
   • Frequency capping: Determines the number of times this ad unit can show an ad to the same user. You can choose not to set a limit, or you can limit ads for each user by the number shown per minute, hour, or day.

   • eCPM floor: You can set an eCPM floor (also known as a minimum eCPM) for each ad unit you create. This instructs the AdMob Network not to serve ads to this ad unit with eCPM values below the minimum eCPM you’ve set. Select how you want to set the eCPM floor:

     1.  Google optimized: Google dynamically sets your floors based on your users’ geographic locations, ad unit’s traffic, and historical data. Using Google optimized eCPM floors can help you maximize total revenue. You can choose how Google optimizes your eCPM floor by selecting one of the following methods:
        • High floor (Beta): Google will maximize the higher paying ads.
        • Medium floor (Beta): Google will balance higher paying ads and fill rate. 
        • All prices: Google will maximize fill rate at all price points.  
          
     2. Manual floor: You manually set the value of the minimum eCPM for each ad unit. The AdMob Network won’t serve ads with an eCPM below the minimum eCPM you’ve set to the ad unit.
     3. Disabled: There is no eCPM floor on this ad unit.

     Note: This eCPM floor only applies to the AdMob Network. It does not apply to third-party ad networks and custom events configured as ad sources in a mediation group.
   • (optional) Country-specific floors: If you've selected Manual floor as the eCPM floor in the previous step, you can click Add country-specific floors to add country-specific eCPM floors for this ad unit. Country-specific eCPM floors will override this ad unit’s global eCPM value only when ad requests originate from the selected country.

     1. Select a country for which you want to set a specific floor. It will be added to the list of selected countries. You can select whole regions, or expand each section to view the individual countries within a region.
     2. Click Edit beside the country or region you selected and enter an eCPM floor value. 
     3. Click Set to save the eCPM value. 
     4. Repeat these steps as required.
9. Click Create ad unit.
10. Follow the instructions in the Google Developer documentation (Android, iOS) to implement app open ads. You will need your app ID and ad unit ID during implementation.
    This ad unit won't show ads until you've completed this step. If you're not ready to implement the ad unit, you can click Email this to send the instructions by email or click Done to exit the page.