When comparing UseResponse vs ClickHelp, the Slant community recommends UseResponse for most people. In the question“What are the best hosted internal knowledge base tools for organisations?” UseResponse is ranked 9th while ClickHelp is ranked 10th. The most important reason people chose UseResponse is:
Currently supports 10 languages, translation tool available.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Multi-language support
Currently supports 10 languages, translation tool available.

Pro Self-hosted option available
It includes unlimited number of users, agents, topics, support of SSL encryption, polls, announcements, and 1 year of support & upgrade. There are also commercial add-ons that can be purchased separately.
Pro Full UI Customization
Easy to configure the interface and the flows
Pro Online collaboration
You can collaborate with your team members online, in real time - leave comments, to-do notes and other stuff.
Pro Customizable workflow
You can create your own workflow instead of the default one.
Pro Unlimited version history
Pro Amazing support
Support is always super-fast and helps to resolve any problems that occur.
Cons

Con No free version
Con Expensive
