The reason is simple because PDF format was actually developed by Adobe back in 1993. Inarguably, Adobe Acrobat Reader is the most popular PDF reader, not only on iOS platform but also on any other platforms.
In this article, we’ve listed the best PDF Reader apps for your iPad and iPhone which can help you complete PDF related tasks easily and quickly. PDF is one of the most popular and widely used file formats and as more people are working and studying on the go, it is important to have a good PDF reader app installed on your mobile devices.