In general, this specification relates to content presentation. The subject matter of this specification can be embodied in, among other things, methods that include the actions of receiving a group of content items at a user device, the content items configured for presentation to a user in association with other content, each content item of the group of content items including metadata associated with the content item; identifying a request from an application of the user device to present a content item in association with particular content; selecting, using one or more processors, a content item from the group of content items using the metadata for the content items along with local targeting information; and presenting the selected content item.