Docr - Docr is a free app for the iPhone smartphones that lets its users scan all of their documents into sharp images and, in the end, store them as PDF files.

Genius Scan - On The Go.

Scanner Pro - Scanner Pro turns your iPhone into portable scanner in your pocket.

Handyscan - Handyscan is your personal document scanner.

Scanbot - Scanbot is a mobile app that allows you to use your device's camera as a document scanner. The app is capable of scanning a large number of source materials, and it can handle QR codes as well.

Docutain - Digitize, manage and find documents efficiently. With Docutain, your smartphone not only becomes a scanner, but you also get a complete and secure document management system including a QR code scanner.