13. The system of claim 12 , wherein the content described by the application page data further includes image data depicting an image of the application page.
13. The system of claim 12 , wherein the content described by the application page data further includes image data depicting an image of the application page. 14. The system of claim 13 , wherein generating application page data describing content of the application page comprises: performing optical character recognition (OCR) on the image data to generate OCR text; and generating, based on the OCR text, text data describing the text that a user device displays on the application page.