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Cloud · head to head

Caddy vs HTMX

Caddy logo

Caddy

Cloud

Web server with automatic HTTPS by default

From
Free
Rated
-
Full reviewWebsite
HTMX logo

HTMX

Web Development

Lightweight JavaScript library enabling AJAX, WebSockets, and server-sent events in HTML

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Caddy smaller ecosystem than Nginx, so third-party guides and modules are fewer; HTMX best suited for server-rendered architectures, not pure client-side SPAs
  • They diverge on capability: Caddy covers Automatic HTTPS, HTMX covers AJAX requests.

Where they differ

Only the attributes on which Caddy and HTMX actually diverge.

Attributes where Caddy and HTMX differ
AttributeCaddyHTMX
Pricing modelOpen source, no licence feeopen-source
PlatformsLinux, macOS, Windows, DockerWeb
CategoryCloudWeb Development

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Caddy

  • Automatic HTTPS
  • Caddyfile
  • Reverse proxy
  • Single binary

Only in HTMX

  • AJAX requests
  • HTTP verb support
  • DOM targeting
  • Swap strategies
  • WebSocket support
  • Server-sent events
  • Out-of-band updates

What people use each for

The jobs each tool is most often brought in to do.

Caddy

  • Sites and services where expired certificates have caused outages beforenot HTMX
  • Small deployments where Nginx configuration is more effort than the problem warrantsnot HTMX
  • Reverse proxying internal services with TLS without a certificate workflownot HTMX

HTMX

  • Building interactive applications without JavaScript framework complexitynot Caddy
  • Server-rendered applications requiring dynamic updatesnot Caddy
  • Adding interactivity to existing server-side applicationsnot Caddy
  • Hypermedia-driven applications using HTML-first approachesnot Caddy

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Caddy

  • Smaller ecosystem than Nginx, so third-party guides and modules are fewer
  • Adding plugins means rebuilding the binary rather than loading a module
  • Under very high throughput Nginx generally still benchmarks ahead
  • Automatic certificate issuance needs outbound internet access, which complicates air-gapped deployments

HTMX

  • Best suited for server-rendered architectures, not pure client-side SPAs
  • Limited client-side state management capabilities compared to frameworks
  • Smaller ecosystem with fewer third-party libraries and tools
  • Learning curve for developers from JavaScript framework backgrounds

Pricing, plan by plan

Caddy

Free
  • CaddyFree
    • Full functionality
    • Commercial use permitted
    • Community support

HTMX

Free

No published plan breakdown. See the HTMX review.

Which should you pick?

Choose Caddy if

  • You need automatic https.
  • You want to start without paying.
  • You work on Linux, macOS, Windows, Docker.
  • You also want caddyfile.
Caddy review

Choose HTMX if

  • You need ajax requests.
  • You want to start without paying.
  • You also want http verb support.
HTMX review

Questions people ask

Is Caddy or HTMX better?
Neither clearly leads. Caddy starts at Free and HTMX at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Caddy or HTMX?
Caddy starts at Free and HTMX at Free.
Does Caddy or HTMX run on more platforms?
Caddy runs on Linux, macOS, Windows, Docker. HTMX runs on Web.
Can I use Caddy for free?
Both have a free tier, so you can try either at no cost before committing.
What is Caddy best used for?
Caddy is most often used for sites and services where expired certificates have caused outages before, small deployments where nginx configuration is more effort than the problem warrants, reverse proxying internal services with tls without a certificate workflow. Of those, sites and services where expired certificates have caused outages before and small deployments where nginx configuration is more effort than the problem warrants are not what HTMX is typically brought in for.
What can Caddy do that HTMX cannot?
Caddy covers Automatic HTTPS, Caddyfile, Reverse proxy, Single binary. HTMX covers AJAX requests, HTTP verb support, DOM targeting, Swap strategies.

Answered from the vendors’ own pages

Caddy: Is Caddy free?

Yes, open source under the Apache 2.0 licence, free for commercial use.

HTMX: How big is the HTMX JavaScript library?

HTMX is only 16 kilobytes minified and gzipped with zero external dependencies.

Source
Caddy: What does automatic HTTPS mean?

Caddy obtains certificates from Let’s Encrypt or ZeroSSL on first request and renews them before expiry, with no cron job or configuration.

HTMX: Can HTMX work with JSON APIs?

While HTMX is optimized for HTML responses, it can work with JSON through additional configuration and response handling.

Source
Caddy: Caddy or Nginx?

Caddy is dramatically simpler to configure and removes certificate management. Nginx has the larger ecosystem and better peak throughput.

HTMX: Does HTMX support real-time features like WebSockets?

Yes, HTMX includes support for WebSockets and server-sent events for real-time bidirectional communication.

Source
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