Connect libraries are 100% compatible with gRPC - in many cases, they implement the gRPC spec more faithfully than the core libraries themselves: https://buf.bu

Connect libraries are 100% compatible with gRPC - in many cases, they implement the gRPC spec more faithfully than the core libraries themselves: https://buf.build/blog/grpc-conformance-deep-dive https://buf.build/blog/grpc-conformance-deep-dive TLDR: there should be no migration cost.