[_yp]

> Phabricator is nice, but it's more of a full-featured replacement for GitHub as a whole. Some people want to keep most of GitHub and just improve on the code review aspects.

That's the nice thing about Phabricator, you can switch off all features you don't need, and it integrates with GitHub. You can definitely use it just for code reviews, with users logging in using their GitHub accounts and the repositories being hosted by GitHub.

> You can also deploy Review Ninja (and soon Reviewable) on-premises, though of course that means you're on the hook for administrating the system again.

That would work! Third party SaaS probably includes Github.