The best alternatives to PubPub are Time for Startups, Userflow, and 9mCollab. If these 3 options don't work for you, we've listed a few more alternatives below.
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Build truly sophisticated user onboarding experiences. It’s so much more than the typical guides with a series of “Next” buttons. Userflow can react to any element or event in your app using “if this, then that...
With 9mCollab you will enjoy well structured, distraction free communication, that is seamlessly transferred into knowledge base through a highly efficient conclusions driven process.