Softwr

Cloud · head to head

Packer vs Preact

Packer logo

Packer

Cloud

Build automated machine images

From
Free
Rated
-
Full reviewWebsite
Preact logo

Preact

Web Development

3kB alternative to React with the same modern API

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: 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; Preact compatibility through preact/compat is good but not total, and some React libraries break in ways that are hard to diagnose
  • They diverge on capability: Packer covers Image building, Preact covers 3kB runtime.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Packer and Preact actually diverge.

Attributes where Packer and Preact differ
AttributePackerPreact
Pricing modelopen-sourceOpen source, no licence fee
PlatformsLinux, Windows, MacWeb
CategoryCloudWeb Development
Founded2013Unknown

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 Packer

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

Only in Preact

  • 3kB runtime
  • preact/compat
  • Same modern API
  • Fast rendering

What people use each for

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

Packer

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

Preact

  • Embedded widgets that load inside someone else’s page and must stay smallnot Packer
  • Marketing and content sites where JavaScript payload affects Core Web Vitalsnot Packer
  • Applications targeting low-bandwidth or low-powered devicesnot Packer

Where each one falls short

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

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

Preact

  • Compatibility through preact/compat is good but not total, and some React libraries break in ways that are hard to diagnose
  • Behavioural differences from React exist in edge cases, particularly around event handling
  • A much smaller community, so unusual problems have fewer existing answers than React

Pricing, plan by plan

Packer

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

Preact

Free
  • PreactFree
    • Full library
    • Commercial use permitted
    • No usage limits

Which should you pick?

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

Choose Preact if

  • You need 3kb runtime.
  • You want to start without paying.
  • You also want preact/compat.
Preact review

Questions people ask

Is Packer or Preact better?
Neither clearly leads. Packer starts at Free and Preact at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Packer or Preact?
Packer starts at Free and Preact at Free.
Does Packer or Preact run on more platforms?
Packer runs on Linux, Windows, Mac. Preact runs on Web.
Can I use Packer for free?
Both have a free tier, so you can try either at no cost before committing.
What is Packer best used for?
Packer is most often used for building identical machine images for multiple clouds from one template, baking golden amis and vm images into a ci pipeline, creating immutable infrastructure artifacts consumed by terraform. Of those, building identical machine images for multiple clouds from one template and baking golden amis and vm images into a ci pipeline are not what Preact is typically brought in for.
What can Packer do that Preact cannot?
Packer covers Image building, Multi-platform support, Provisioners, Builders. Preact covers 3kB runtime, preact/compat, Same modern API, Fast rendering.

Answered from the vendors’ own pages

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
Preact: Is Preact free?

Yes, open source under the MIT licence.

Preact: Can I use React libraries with Preact?

Most, through the preact/compat layer. Compatibility is good but not complete, so libraries relying on React internals can break.

Preact: Why choose Preact over React?

Bundle size, almost always. If payload is not a binding constraint, React’s ecosystem is usually the better trade.

Share

Related pages

More on Packer

More on Preact

Keep looking

Other head to heads