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I know that writing your own PDF renderer and PDF library takes considerable time, effort and money. I understand that it is prohibitive for a start-up to write its own PDF reader with annotation from scratch.

So how did popular PDF apps on iOS and Android do it? Apps like iAnnotate, PDF Expert, Repligo... how did they manage to get such a good reader/renderer with annotation and other tools, as they were not established companies? My sources tell me that it take years and millions of dollars of development to achieve..

Surely these apps must have used 3rd party tools, but I can't seem to find who they used.

Can anyone shed any light on this for me?

Cheers

Alistairm
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  • Writting your own would be cool idea. Breakdown to whole project. Start with a pdf reader and then add a tool bar with specific functions that you want. Writting complex apps takes time, that's for sure, but if you want to create something nice that consumers would like you need to invest your time. As far as sources, web is full of all kinds of source codes. You need to research. – Adrian P Feb 20 '14 at 04:03
  • Ok, thanks for your responses. But what I would really like to know is... do iAnnotate and PDF Expert own their own IP for rendering PDFs? If not, who do they use? If yes, did they own it from the beginning? I have exhausted Google searching, and don't seem to be able to find the answer... – Alistairm Feb 20 '14 at 04:22

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