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Development Tools · head to head

Harness vs ESLint

Harness logo

Harness

Development Tools

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

From
On request
Rated
-
Full reviewWebsite
ESLint logo

ESLint

Development Tools

Find and fix problems in JavaScript code

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only ESLint has a free tier, so it costs nothing to try first.
  • Each has a real cost: Harness essentials plan caps users at 500, organizations at 1, custom dashboards at 5 and concurrent CI pipeline executions at 60, all unlimited only on Enterprise; ESLint slow performance on large codebases compared to newer tools like Oxlint and Biome

Where they differ

Only the attributes on which Harness and ESLint actually diverge.

Attributes where Harness and ESLint differ
AttributeHarnessESLint
Starting priceOn requestFree
Pricing modelquoteUnknown
Free tierNoYes
PlatformsWebBrowser-based JavaScript, Node.js, Any JavaScript environment
FoundedUnknown2019

Identical on both: user rating (Not yet rated), category (Development Tools).

What people use each for

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

Harness

No use cases recorded yet. See the Harness review.

ESLint

  • Statically analysing JavaScript and JSX to find problems before runtimenot Harness
  • Automatically fixing issues with syntax-aware rewritesnot Harness
  • Enforcing a consistent code style across a teamnot Harness
  • Running as a CI step to block non-conforming codenot Harness
  • Writing custom rules for project-specific conventionsnot Harness

Where each one falls short

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

Harness

  • Essentials plan caps users at 500, organizations at 1, custom dashboards at 5 and concurrent CI pipeline executions at 60, all unlimited only on Enterprise
  • Pipeline history is limited to 6 months on the Essentials plan; extending to 25 months requires an Enterprise add-on
  • Enterprise plan pricing is quote only, reached by contacting sales rather than a published rate

ESLint

  • Slow performance on large codebases compared to newer tools like Oxlint and Biome
  • Complexity in configuration from scratch, particularly for TypeScript support
  • Limited built-in TypeScript support, requiring separate parsers and coordination with new TypeScript features

Pricing, plan by plan

Harness

On request

No published plan breakdown. See the Harness review.

ESLint

Free

No published plan breakdown. See the ESLint review.

Which should you pick?

Choose Harness if

Nothing in the data separates Harness from ESLint on the points above - pick on price and on how each one feels to use.

Harness review

Choose ESLint if

  • You want to start without paying.
  • You work on Browser-based JavaScript, Node.js, Any JavaScript environment.
ESLint review

Questions people ask

Is Harness or ESLint better?
Neither clearly leads. Harness starts at On request and ESLint at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Harness or ESLint?
ESLint has a free tier; the other does not. Paid plans start at On request for Harness and Free for ESLint.
Does Harness or ESLint run on more platforms?
Harness runs on Web. ESLint runs on Browser-based JavaScript, Node.js, Any JavaScript environment.
Can I use ESLint for free?
Yes. ESLint has a free tier, so you can try it without paying. Harness starts at On request.

Answered from the vendors’ own pages

ESLint: Does ESLint automatically fix code issues?

Many problems ESLint finds can be automatically fixed via the --fix flag. ESLint fixes are syntax-aware so you won't experience errors introduced by traditional find-and-replace algorithms.

Source
ESLint: How much does ESLint cost?

ESLint is completely free and open-source software maintained by the OpenJS Foundation. The project accepts voluntary donations from sponsors.

Source
ESLint: Can I write custom ESLint rules?

Yes. You can develop custom rules that work alongside built-in functionality through ESLint's plugin system, allowing complete customization for your project needs.

Source
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