When comparing PHPBack vs Helprace, the Slant community recommends Helprace for most people. In the question“What are the best user support & feedback services?” Helprace is ranked 9th while PHPBack is ranked 10th. The most important reason people chose Helprace is:
You can answer support tickets by responding to a notification that gets sent to your email.
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Pros
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.
Pro E-mail integration
You can answer support tickets by responding to a notification that gets sent to your email.
Pro Reasonable prices
Compared to other similar programs, Helprace has affordable prices at $9 or $18 an agent per months.
Pro Free trial
Helprace offers a 30 day free trial on all plans and doesn't require a credit card to sign up.
Cons
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.
Con Lack of third party integrations
Helprace does not offer much support for integrating third party services.