We launched PSPDFKit Instant today, which makes it easy to build apps that sync PDFs. pspdfkit.com/blog/2017/pspdfkit-instant/
Instant has very cool real-time collaboration, and you can try it out at pspdfkit.com/instant/try/
I’ve been working mostly on the Instant iOS framework but also the product as a whole. I’ve learned a lot seeing all the parts fit together.