What are some alternatives?
When comparing KDAN Mobile PDF Reader and Quick View Plus, you can also consider the following products
PDFelement - All-in-one PDF editor
Documents Pro 7 - The ultimate all-in-one mobile office suite for the iPhone and iPad with 8 premium apps in 1.
Winmail.dat Viewer Pro Edition - View, Annotate, Edit, Convert, Sign, Create & Fill forms, OCR, Create PDFs. Download Free trial PDF Reader Pro - All in one PDF Office alternative to Adobe Reader, and get it from Mac, iOS, Windows, Android.
Documents by Readdle - A central hub for all your files.
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
FileApp - FileApp is an iPhone and iPad File System and Document Viewer.