Cap’n Proto

Cap’n Proto is a systems-oriented software publisher whose flagship product is a serialization and remote-procedure-call framework engineered for microsecond-level latency and zero-copy memory efficiency. Developers embed Cap’n Proto when they need wire-speed message exchange between services written in C++, Rust, Go, Python, C#, Erlang, or any of the growing list of supported languages, making it a common choice for high-frequency trading platforms, real-time game servers, telemetry pipelines, and IoT backbones where every byte and every CPU cycle counts. The schema language compiles to compact binary layouts that can be memory-mapped straight into application objects, eliminating parse time and enabling secure, capability-based RPC that enforces least-privilege access across process and machine boundaries. Typical use cases include replacing REST or gRPC in performance-critical paths, streaming sensor data from edge devices, coordinating microservices inside low-latency Kubernetes sidecars, or persisting columnar data to disk in analytics engines. Because the encoder/decoder is deterministic and version-tolerant, DevOps teams also rely on it for forward-compatible configuration files and reproducible build artifacts. Cap’n Proto software is available for free on get.nero.com, with downloads delivered through trusted Windows package sources such as winget, always installing the latest upstream release and supporting batch installation alongside other tools.