That might be a silly question but it's not useful for just an individual in a team, correct? We use GitHub at work, but I wouldn't be able to try Phabricator on my own, right?
Mostly correct. You can use the code review tools without needing your repository set up in Phabricator or anyone else with Phabricator accounts. You could comment on a diff and point your coworker to it, but it's unlikely to feel better than Github pull requests in that scenario.
