PaperScanner v1.1.0

Plain document scanner + PDF export. Point the phone at a page, tap Start, pages are captured automatically as you turn them; tap Stop to share a PDF. (Earlier versions also tried to detect and tally red-circled marks on exam pages; that's been removed.)

Install: download paperscanner.apk below, open it on an Android device (you may need to allow installs from this source), and install.