Caddy and Nginx are both modern, event-driven web servers that excel as reverse proxies. Nginx is the long-established workhorse; Caddy is newer and famous for automatic HTTPS and a very short config file. This Caddy vs Nginx comparison looks at what actually differs in daily use so you can choose for your next VPS project.
Before you start
- If Apache or LiteSpeed are also on your list, read Apache vs Nginx vs LiteSpeed.
At a glance
| Aspect | Caddy | Nginx |
|---|---|---|
| Written in | Go (memory-safe) | C |
| HTTPS | Automatic: obtains and renews certificates, redirects HTTP | Manual: Certbot or acme.sh plus config |
| Config | Caddyfile (short) or JSON API | nginx.conf (verbose, very flexible) |
| HTTP/3 | On by default | Supported since 1.25, opt-in |
| Live config changes | Admin API, zero-downtime reload | Graceful reload |
| Raw performance | Very good | Excellent, lowest memory at extreme scale |
| Caching | Via plugins | Built-in proxy_cache and fastcgi_cache |
| Extensions | Plugins compiled in with xcaddy | Dynamic modules, large third-party ecosystem |
| Docs, tutorials, panel support | Growing | Huge; supported by most tools and panels |
HTTPS and certificates
This is Caddy's headline feature. Put a domain in the Caddyfile and Caddy gets a certificate from Let's Encrypt or ZeroSSL, renews it, staples OCSP and redirects HTTP to HTTPS, with no extra lines. It can even issue certificates on demand for customer domains, which suits SaaS platforms. With Nginx you install Certbot, run it per domain and rely on its timer, which works well but is one more moving part (Certbot guide).
Configuration
A reverse proxy with HTTPS in Caddy:
app.example.com {
reverse_proxy 127.0.0.1:3000
}The same in Nginx needs two server blocks, certificate paths, and several proxy_set_header lines. Nginx's verbosity buys fine-grained control: dozens of tunables for buffers, timeouts, caching and connection handling. Caddy covers common needs with sensible defaults; unusual requirements may need a plugin or the JSON config. See Caddyfile examples.
Performance
For typical websites and APIs both are far faster than the application behind them, so the difference is rarely noticeable. Under very high concurrency Nginx uses less memory and CPU per connection. If you serve huge amounts of static traffic or run a large edge proxy, Nginx has the edge; for most VPS projects, either is fine.
PHP hosting
Both pass PHP to PHP-FPM. Caddy's php_fastcgi directive replaces a whole Nginx location block. Nginx adds a mature built-in FastCGI page cache, which matters for busy WordPress sites. Neither reads .htaccess; for that, use Apache or LiteSpeed.
Security
- Caddy is written in Go, avoiding whole classes of memory-safety bugs, and ships secure TLS defaults.
- Nginx has a long, well-audited track record and fast security releases.
- Both need the same app-level care: headers, rate limiting, least privilege.
Operations and ecosystem
- Nginx is everywhere: Kubernetes ingress controllers, Plesk, control panels, almost every deployment tutorial.
- Caddy is a single static binary with no dependencies, easy to run in containers, and its admin API suits automated setups.
- Nginx monitoring is widely supported (stub_status exporters); Caddy exposes Prometheus metrics natively.
Which should you choose?
- Small projects, side apps, internal tools, quick reverse proxies: Caddy. HTTPS just works.
- SaaS with many customer domains: Caddy's on-demand TLS is a big time saver.
- High-traffic sites, complex routing or built-in caching: Nginx.
- Teams following existing tutorials and tooling: Nginx.
- WordPress on shared hosting: neither; LiteSpeed with LSCache is already set up on MdmHost.
FAQ: Caddy vs Nginx
Can Caddy replace Nginx completely?
For most sites yes. Check that any Nginx module you rely on has a Caddy equivalent.
Can I run both?
Yes, but not both on ports 80/443. One can sit behind the other, though that rarely adds value.
Is Caddy production-ready?
Yes. It's widely used in production, from small sites to large platforms.