Is ESLint or Harness better?

Neither clearly leads. ESLint starts at Free and Harness at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.

Which is cheaper, ESLint or Harness?

ESLint has a free tier; the other does not. Paid plans start at Free for ESLint and On request for Harness.

Does ESLint or Harness run on more platforms?

ESLint runs on Browser-based JavaScript, Node.js, Any JavaScript environment. Harness runs on Web.

Can I use ESLint for free?

Yes. ESLint has a free tier, so you can try it without paying. Harness starts at On request.

What is ESLint best used for?

ESLint is most often used for statically analysing javascript and jsx to find problems before runtime, automatically fixing issues with syntax-aware rewrites, enforcing a consistent code style across a team, running as a ci step to block non-conforming code. Of those, statically analysing javascript and jsx to find problems before runtime and automatically fixing issues with syntax-aware rewrites are not what Harness is typically brought in for.

Software · head to head

ESLint vs Harness

ESLint

Software

Find and fix problems in JavaScript code

From: Free
Rated: -

Full review Website

Harness

Software

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

From: On request
Rated: -

Full review Website

The short version

Only ESLint has a free tier, so it costs nothing to try first.
Each has a real cost: ESLint slow performance on large codebases compared to newer tools like Oxlint and Biome; 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

Where they differ

Only the attributes on which ESLint and Harness actually diverge.

Attributes where ESLint and Harness differ
Attribute	ESLint	Harness
Starting price	Free	On request
Pricing model	Unknown	quote
Free tier	Yes	No
Platforms	Browser-based JavaScript, Node.js, Any JavaScript environment	Web
Founded	2019	Unknown

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

What people use each for

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

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

Harness

No use cases recorded yet. See the Harness review.

Where each one falls short

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

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

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

Pricing, plan by plan

ESLint

Free

No published plan breakdown. See the ESLint review.

Harness

On request

No published plan breakdown. See the Harness review.

Which should you pick?

Choose ESLint if

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

ESLint review

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

Questions people ask

Is ESLint or Harness better?: Neither clearly leads. ESLint starts at Free and Harness at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, ESLint or Harness?: ESLint has a free tier; the other does not. Paid plans start at Free for ESLint and On request for Harness.
Does ESLint or Harness run on more platforms?: ESLint runs on Browser-based JavaScript, Node.js, Any JavaScript environment. Harness runs on Web.
Can I use ESLint for free?: Yes. ESLint has a free tier, so you can try it without paying. Harness starts at On request.
What is ESLint best used for?: ESLint is most often used for statically analysing javascript and jsx to find problems before runtime, automatically fixing issues with syntax-aware rewrites, enforcing a consistent code style across a team, running as a ci step to block non-conforming code. Of those, statically analysing javascript and jsx to find problems before runtime and automatically fixing issues with syntax-aware rewrites are not what Harness is typically brought in for.

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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ESLint vs Harness

ESLint

Harness

The short version

Where they differ

What people use each for

ESLint

Harness

Where each one falls short

ESLint

Harness

Pricing, plan by plan

ESLint

Harness

Which should you pick?

Choose ESLint if

Choose Harness if

Questions people ask

Answered from the vendors’ own pages

Related pages

More on ESLint

More on Harness

Keep looking

Other head to heads