Reviewable.io is the one which I was thinking of. GitHub provides a list: https://github.com/integrations/feature/code-review https://github.com/integrations/f

Reviewable.io is the one which I was thinking of. GitHub provides a list: https://github.com/integrations/feature/code-review https://github.com/integrations/feature/code-review I don't think that that is an exhaustive list; for instance GerritHub is missing (although I'm not a fan of it).