Third grade students at both my campuses utilized the app, Strip Design to make inferences based on a picture. Students selected a picture and wrote a sentence on what they inferred happened before the picture was taken and what they inferred happened after the picture was taken. Products were then saved as a pdf and uploaded to FlipSnack, a free (with limitations) interactive book. (Direct link to Inferencing flipbook.)
Note: If you do not have access to an idevice, you could always use Pages, Publisher, or Word to create the document/product.