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Developer Tools · head to head

Harness vs Preact

Harness logo

Harness

Developer Tools

Software delivery platform across CI, CD, security testing and cost management

From
Free
Free plan
Yes
Full reviewWebsite
Preact logo

Preact

Web Development

3kB alternative to React with the same modern API

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Each has a real cost: Harness essentials and Enterprise pricing requires sales contact; no published rates; Preact compatibility through preact/compat is good but not total, and some React libraries break in ways that are hard to diagnose
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which Harness and Preact actually diverge.

Attributes where Harness and Preact differ
AttributeHarnessPreact
Pricing modelfreemiumOpen source, no licence fee
CategoryDeveloper ToolsWeb Development

Identical on both: starting price (Free), free tier (Yes), platforms (Web), 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 Harness

Nothing recorded that Preact does not also cover.

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.

Harness

  • Deploying apps to AWS, Azure, and Google Cloud with rollbacksnot Preact
  • Integrating security scanners throughout build pipelines before productionnot Preact
  • Automating cloud cost reduction and tracking unit-level expensesnot Preact
  • Enabling developers to provision infrastructure without operations bottlenecksnot Preact
  • Assessing deployment frequency and lead time productivity metricsnot Preact

Preact

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

Where each one falls short

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

Harness

  • Essentials and Enterprise pricing requires sales contact; no published rates
  • DevOps Essentials has no on-premises deployment option
  • Internal Developer Portal requires minimum 20 developer licenses
  • Pipeline execution history retention 6 months (Essentials) vs 25 months as add-on (Enterprise)

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

Harness

Free
  • FreeFree
    • Starter platform for software delivery lifecycle
    • Open source options available (Harness Open Source, Litmus Chaos)
  • Essentials$null/month
    • Growing organizations with small to mid-size teams
    • Packaged DevOps Essentials bundle
    • Continuous software delivery capabilities
  • Enterprise$null/month
    • Large-scale organizations
    • Pick any modules based on needs
    • Advanced features

Preact

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

Which should you pick?

Choose Harness if

  • You want to start without paying.
Harness 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 Harness or Preact better?
Neither clearly leads. Harness 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, Harness or Preact?
Harness starts at Free and Preact at Free.
Does Harness or Preact run on more platforms?
Both run on Web, so platform support will not decide this one for you.
Can I use Harness for free?
Both have a free tier, so you can try either at no cost before committing.
What is Harness best used for?
Harness is most often used for deploying apps to aws, azure, and google cloud with rollbacks, integrating security scanners throughout build pipelines before production, automating cloud cost reduction and tracking unit-level expenses, enabling developers to provision infrastructure without operations bottlenecks. Of those, deploying apps to aws, azure, and google cloud with rollbacks and integrating security scanners throughout build pipelines before production are not what Preact is typically brought in for.
What can Harness do that Preact cannot?
Preact covers 3kB runtime, preact/compat, Same modern API, Fast rendering.

Answered from the vendors’ own pages

Harness: Is there a free Harness plan?

Yes, Harness offers a free plan for individual developers and small teams with open source options including Harness Open Source and Litmus Chaos.

Source
Preact: Is Preact free?

Yes, open source under the MIT licence.

Harness: What are Harness's paid pricing tiers?

Harness offers Essentials for growing teams and Enterprise for large-scale organizations. Both require contacting sales for custom pricing. Pricing is based on modules and features selected.

Source
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.

Harness: Can Harness be deployed on-premises?

Enterprise plans include self-managed platform deployment option. DevOps Essentials bundle does not offer on-premises deployment.

Source
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.

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