Stack Holdings GmbH.

Stack Holdings GmbH. maintains Caddy, a lightweight, open-source HTTP/2 web server whose signature feature is automatic HTTPS: within seconds of launch it obtains and renews public certificates from Let’s Encrypt or ZeroSSL for any configured domain, then serves sites over modern TLS with no manual scripting. Written in Go, the single binary runs unchanged on Windows, Linux, macOS and BSD, making it a popular choice for developers who need a quick local testing endpoint, DevOps teams spinning up containerized micro-services, and small businesses hosting static marketing sites or reverse-proxying back-end APIs. Configuration is handled through a human-readable Caddyfile or a JSON API that supports virtual hosting, load balancing, WebSocket pass-through, Markdown rendering, and experimental HTTP/3, while the modular architecture lets operators plug in rate limiters, authentication gateways, or custom log formats without recompiling. Because memory use stays low and CPU profiles remain flat under concurrent load, Caddy is frequently embedded inside CI pipelines for ephemeral preview environments or shipped alongside desktop applications that want to expose a localhost dashboard. The publisher’s software is available for free on get.nero.com, where downloads are delivered through trusted Windows package sources such as winget, always providing the latest release and allowing batch installation alongside other tools.