Buf
Buf provides Protobuf and gRPC tooling, a schema registry, and API frameworks for software teams.
Founded
2019Buf provides Protobuf and gRPC tooling, a schema registry, and API frameworks for software teams.
Buf Technologies develops an end-to-end platform for Protocol Buffers and gRPC, the interface-definition system and remote-procedure-call framework widely used to connect backend services. Its flagship command-line tool compiles, lints, formats, generates code from, and checks the backward compatibility of Protobuf schemas, letting engineering teams treat API definitions as versioned software artifacts.
The company pairs that open-source toolchain with the Buf Schema Registry, a hosted service that stores versioned schema modules, generates client libraries in multiple languages, and publishes documentation for those interfaces. Buf also maintains ConnectRPC and Protovalidate, sibling open-source projects for browser-and-server RPC and cross-language validation that extend the reach of its core tooling.
Demand for structured API contracts continues to grow as organizations break monolithic applications into many interconnected services. Protocol Buffers and gRPC have become a common foundation for that service-to-service communication, especially in backend, infrastructure, and platform-engineering teams that value strongly typed interfaces.
Within that market, schema registries and governance tooling represent an emerging category that addresses the operational burden of managing interfaces at scale. Buf is positioned at the intersection of open-source developer tooling and hosted registry services, a combination that lets it serve individual developers while offering enterprises the controls, auditing, and multi-language code generation they require.
Buf differentiates itself by treating API schemas as first-class versioned artifacts rather than loose files copied between repositories. Its tooling enforces backward compatibility and lint rules automatically, so teams catch breaking changes before they reach production, a discipline that general-purpose Protobuf generators do not provide by default.
The Buf Schema Registry adds centralized hosting, semantic versioning, and managed code generation, giving organizations one governed source of truth for shared interfaces across services and languages. Because the command-line tool, registry, and the ConnectRPC and Protovalidate libraries are developed together, Buf offers an integrated path from local development to enterprise-wide schema governance.
Buf separates its offering into a free, open-source command-line tool and a hosted Buf Schema Registry with tiered plans. The CLI is distributed at no cost under a permissive license, which drives adoption among individual developers and small teams and seeds demand for the paid registry.
The registry is offered on free and paid tiers, with paid plans adding features such as private module hosting, larger usage limits, and enterprise controls. Buf also sells custom and self-hosted enterprise deployments to larger organizations that need stricter governance over how their API definitions are stored, generated, and distributed.