What’s the best PDF flip book/viewer?

I work for a newspaper company and have been put forth to update our website. Working with a Web Developer we are upgrading the site to a more new concept but I am having a bit of trouble finder a decent standard pdf flip book to appease my boss.
Currently we use [3D Flipbook]) but it’s lacking in the ability for zooming in close. (Which is super important when your main demographic is boomers)

It would be super helpful if anyone had any ideas on one that worked well across different devices (iPhone and Desktop), Zooms in nicely, and functions well.

Money is not an issue and any help would be appreciated!
(Have checked out dearflip as well)


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