[angerman]

Phabricator is a very good tool! But calling it a substitute for GitHub seems a bit off. GitHub (and GitLab) revolve around repositories. As the name implies they are focused on git and git workflows. As a user you are using `git` most of the time when interacting with the systems.

Phabricator on the other can supports `git`, but that's just one of the supported storage systems for phabricator. As a user you are using `arc`, phabricators command line tool.

I've seen many people having issues with using `arc`, having used, say github, prior to that. This got better recently when the `arc land` workflow was improved.

[eeZi]

It's a fine substitute for GitHub. Both are source code and project management tools. Just because they have different user interfaces doesn't meant that they don't solve the same problem.

Phabricator is much more flexible and that comes with a small cost in complexity, but the result is a system which provides a superior workflow, especially in enterprise environments:

https://www.quora.com/What-are-the-advantages-Phabricator-ha...

http://cramer.io/2014/05/03/on-pull-requests/