Methods, systems, and apparatus, for retrieving data items associated with objects depicted in an image that is displayed by a user device of a user, and presenting the retrieved data items to the user. In one aspect, a method comprises: receiving image data of an image that is displayed on a display of the user device; performing image processing on the image data to identify one or more objects depicted in the image; generating a search query based on the identified one or more objects depicted in the image, the search query being generated independent of a query input by the user; searching, by the search query, a data storage storing an association of data items with objects; and determining that data items stored in the data storage are responsive to the search query.