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Here's a post comparing Spacelift and Atlantis — which might be useful as a basis for comparing Pulumi Service.

hey Gregory! i’ll jot something down, but a tl;dr Spacelift is primarily an execution mechanism (essentially a CI/CD tool for terraform) Atlantis is a coupling mechanism for terraform modules with state backends Pulumi doesn’t need any of this. The service itself doesn’t have a “deployment engine” (yet)

Thanks @billowy-army-68599!