When comparing Freshdesk vs PHPBack, the Slant community recommends Freshdesk for most people. In the question“What are the best user support & feedback services?” Freshdesk is ranked 1st while PHPBack is ranked 10th. The most important reason people chose Freshdesk is:
Features are constantly being updated and new features added.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Actively developed
Features are constantly being updated and new features added.
Pro Service integrations
Freshdesk offers integration with a huge list of popular services (such as Hangouts, Github, Jira, Mailchimp, Shopify and more).

Pro Multi-language support
It has been already translated to Spanish and they are adding support for more languages.
Pro Easy setup
PHPBack is very easy to setup, all you need is a server with PHP5 and MySQL installed.

Pro Open Source
PHPBack is open source, uses GPLv3 license.
Cons
Con No service integrations with free plan
Cannot create tickets or get notifications with Slack, for instance, because API is only available with a paid plan. Other competitors have API available even with free plan.
Con Adding extra agents can be costly
Cost per agent varies from $15-$79/month, depending on the plan.
Con Small community
PHPBack is fairly young (first stable version was releases in July 2015). Currently the community is small, which may make it more difficult to find help/support.
However, the developer is active on the github page and generally responds quickly.
