I have used few scanning apps. By far this is the best app, the camera works flawlessly to take very clear pictures with good focus. Any document I have to save and email, I use the topscanner. This is a big-time save her as you do not have to load the document on your scanner and then transfer the documents onto your computer and then email them or save them. Whenever I have to scan and save topscanner is my go to app.
meraifone about TopScanner : PDF Scanner App, v2.1