Spend some time working with OpenAPI and gRPC and you’ll notice that these two technologies have a lot in common. Both are open source efforts, both describe APIs, and both promise better experiences for API producers and consumers. So why do we need both? If we do, what value does each provide? What can each project learn from the other? We’ll bring the two together for a side-by-side comparison and pose answers to these and other questions about two API methodologies that will do much to influence the future of networked APIs.