Caddy, a cross-platform HTTP/2 web server
Caddy is a powerful, enterprise-ready, open source web server with automatic HTTPS written in Go
Caddy, a cross-platform HTTP/2 web server launched on April 28, 2015 with 208 votes, #85 of 3,600 launches that month and more than 99% of that year's launches. The site was still online in September 2026, 11 years on.
In plain words
Caddy is an open source web server written in Go that automatically manages HTTPS certificates. It is designed for developers and enterprises that need to serve multiple domains at scale. The software features On-Demand TLS, which obtains and renews certificates automatically during connections, making it useful for SaaS platforms with customer-owned domains. Caddy handles this process reliably across hundreds of thousands of sites without manual intervention.
written from the facts on this page · September 2026
From the sources
The secret sauce of almost every white-label SaaS is Caddy's original On-Demand TLS feature. Grow your SaaS business by orders of magnitude with ease! With On-Demand TLS, only Caddy obtains, renews, and maintains certificates on-the-fly during TLS handshakes. Perfect for customer-owned domains. Other web servers and scripted certificate tools fall over with hundreds of thousands of sites or thousands of instances. Caddy is designed to manage certificates reliably at this scale. Caddy is free software and relies on sponsorships to survive. Not just donations: sponsorships ensure ongoing development and provide your business with tangible benefits. Caddy securely serves all sites with TLS by…from caddyserver.com
Does a similar job
all alternatives →- C2Caddy 22020 · caddyserver.com · ▲778
Caddy is a powerful, enterprise-ready, open source web server with automatic HTTPS written in Go
Caddy-SSH2022 · caffeinatedwonders.com · ▲280Caddy-SSH is a general-purpose, memory-safe SSH server built in Go
CertMagic – Caddy's automagic HTTPS features as a Go library2018 · github.com · ▲33Automatic HTTPS for any Go program: fully-managed TLS certificate issuance and renewal - caddyserver/certmagic
Caddy v2.5.02022 · github.com · ▲269Fast and extensible multi-platform HTTP/1-2-3 web server with automatic HTTPS - Release v2.5.0 · caddyserver/caddy
- DHDetecting HTTPS Interception2017 · caddyserver.com · ▲8
Caddy is a powerful, enterprise-ready, open source web server with automatic HTTPS written in Go
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