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Cloud · head to head

Caddy vs Packer

Caddy logo

Caddy

Cloud

Web server with automatic HTTPS by default

From
Free
Rated
-
Full reviewWebsite
Packer logo

Packer

Cloud

Build automated machine images

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; Packer packer 1.10.0 and later is licensed under the Business Source License 1.1 with IBM Corporation as licensor, not an OSI open source licence
  • They diverge on capability: Caddy covers Automatic HTTPS, Packer covers Image building.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Caddy and Packer actually diverge.

Attributes where Caddy and Packer differ
AttributeCaddyPacker
Pricing modelOpen source, no licence feeopen-source
PlatformsLinux, macOS, Windows, DockerLinux, Windows, Mac
FoundedUnknown2013

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

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 Packer

  • Image building
  • Multi-platform support
  • Provisioners
  • Builders
  • Post-processors
  • Variables
  • Data sources
  • Validation

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 Packer
  • Small deployments where Nginx configuration is more effort than the problem warrantsnot Packer
  • Reverse proxying internal services with TLS without a certificate workflownot Packer

Packer

  • Building identical machine images for multiple clouds from one templatenot Caddy
  • Baking golden AMIs and VM images into a CI pipelinenot Caddy
  • Creating immutable infrastructure artifacts consumed by Terraformnot 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

Packer

  • Packer 1.10.0 and later is licensed under the Business Source License 1.1 with IBM Corporation as licensor, not an OSI open source licence
  • The Additional Use Grant forbids offering Packer to third parties on a hosted or embedded basis in a paid product that competes with IBM's paid versions of Packer
  • Each version converts to the MPL 2.0 Change License only four years after that version is first published, and the Change Date is set separately per version
  • Alternative licensing for uses outside the grant must be arranged with the licensor rather than taken under the public licence

Pricing, plan by plan

Caddy

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

Packer

Free
  • Open SourceFree
    • Multi-platform image building
    • Template-driven
    • Provisioner support

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 Packer if

  • You need image building.
  • You want to start without paying.
  • You work on Linux, Windows, Mac.
  • You also want multi-platform support.
Packer review

Questions people ask

Is Caddy or Packer better?
Neither clearly leads. Caddy starts at Free and Packer at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Caddy or Packer?
Caddy starts at Free and Packer at Free.
Does Caddy or Packer run on more platforms?
Caddy runs on Linux, macOS, Windows, Docker. Packer runs on Linux, Windows, Mac.
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 Packer is typically brought in for.
What can Caddy do that Packer cannot?
Caddy covers Automatic HTTPS, Caddyfile, Reverse proxy, Single binary. Packer covers Image building, Multi-platform support, Provisioners, Builders.

Answered from the vendors’ own pages

Caddy: Is Caddy free?

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

Packer: How much does HashiCorp Packer cost?

Packer does not publish specific pricing on its website. The open-source Packer tool is free, while HCP Packer (HashiCorp's cloud-hosted version) offers a free trial, but detailed pricing requires contacting HashiCorp.

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.

Caddy: Caddy or Nginx?

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

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