What are some alternatives?
When comparing HelpDocs and Intro.js, you can also consider the following products
HelpSite - HelpSite is a simple service to help your setup the perfect support centre or help site.
HelpNDoc - What is HelpNDoc ? Easy to use yet powerful help authoring environment which can generate various documentation formats from a single source.
ScreenSteps - IT Training Docs For Your Cloud Implementation. Use ScreenSteps when your company implements new cloud technology and you need training docs
Helppier - Helppier provides tools to create interactive user guides in minutes.
phpMyFAQ - phpMyFAQ is a world’s most popular mobile-friendly, feature-rich and open-sources FAQ software that uses PHP 5.
Dozuki - Dozuki is a web-based tool for creating and distributing step-by-step documentation.