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I’m looking to build a mobile app on Android/iOS with annotation, adding comments on any page, and edit PDF functionality. Is there an open-source/one-time payment SDK for Android and iOS available in the market?

There is short answer to your question, yes there are many ways to do that, Online Pdf Annotator has one, some small startup too like Ansca and more. Long answer, if your app is not that pixel perfect then by all means try to use those middle layer language that will compile on iOS and Android, but if your app is pixel perfect animation intense then you might think of native compilation. Nothing on this planet so far can beat the performance of iOS devices, simply because there is no layer between the software and the hardware, unlike Android where each manufacture slap a layer to make the OS work. So, choose wisely and be careful of what you wishing for.

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Annotate PDF: All You Need to Know

Linux, see this very relevant article. ) The above may sound like a “no-brainer” answer. However, many people don't know this, and those of you who already know this may find this article interesting. I've been involved in a few Open Source projects including Linux (I wrote about the origins of Linux with the Open Source Definition) and Android. First off, let's review some things that you may think and see if it makes sense. There are two things that you can't make a good operating system with. One would be “technical debt”. A system will have to carry a lot of things forward in order for it to function well. This is a good thing. But another thing you can't do as a system is to make it “better”. Why? Because you can't. You can only make it more efficient in a way which is beneficial for people, or “better”,.

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