With Servo we use https://reviewable.io/ https://reviewable.io/ on github. We don't enforce its use. If a newcomer makes a pull request, we'll just use the GH

With Servo we use https://reviewable.io/ https://reviewable.io/ on github. We don't enforce its use. If a newcomer makes a pull request, we'll just use the GH review interface. In general simple PRs go through the GH review interface, regardless of who they're from. We break out Reviewable when a PR actually needs it (this is usually the choice of the reviewer). This means that Servo continues to have a lower bar to contribution, without hampering maintainers on PRs that need more than GHs set of review features. This has worked out well for us.