Is ESLint or Insomnia better?

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

Which is cheaper, ESLint or Insomnia?

ESLint starts at Free and Insomnia at Free.

Does ESLint or Insomnia run on more platforms?

ESLint runs on Browser-based JavaScript, Node.js, Any JavaScript environment. Insomnia runs on Windows, MacOS, Linux, Web.

Can I use ESLint for free?

Both have a free tier, so you can try either at no cost before committing.

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 Insomnia is typically brought in for.

What can ESLint do that Insomnia cannot?

Insomnia covers REST API Client, GraphQL Support, gRPC Support, GitHub.

Developer Tools · head to head

ESLint vs Insomnia

ESLint

Developer Tools

Find and fix problems in JavaScript code

From: Free
Rated: -

Full review Website

Insomnia

Testing

REST and GraphQL API client for development and testing

From: Free
Rated: -

Full review Website

The short version

Each has a real cost: ESLint slow performance on large codebases compared to newer tools like Oxlint and Biome; Insomnia git Sync on the free tier covers up to 3 users only

Where they differ

Only the attributes on which ESLint and Insomnia actually diverge.

Attributes where ESLint and Insomnia differ
Attribute	ESLint	Insomnia
Pricing model	Unknown	freemium
Platforms	Browser-based JavaScript, Node.js, Any JavaScript environment	Windows, MacOS, Linux, Web
Category	Developer Tools	Testing
Founded	2019	2010

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 ESLint

Nothing recorded that Insomnia does not also cover.

Only in Insomnia

REST API Client
GraphQL Support
gRPC Support
GitHub
GitLab
Slack
Windows support
MacOS support

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 Insomnia
Automatically fixing issues with syntax-aware rewritesnot Insomnia
Enforcing a consistent code style across a teamnot Insomnia
Running as a CI step to block non-conforming codenot Insomnia
Writing custom rules for project-specific conventionsnot Insomnia

Insomnia

Sending and debugging HTTP, GraphQL and gRPC requestsnot ESLint
Storing collections in Git rather than a vendor cloudnot ESLint
Mocking an API endpoint before it existsnot ESLint
Running collections in CI with the Inso CLInot ESLint
Environment management across staging and productionnot ESLint

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

Insomnia

Git Sync on the free tier covers up to 3 users only
Mock servers are capped at 1,000 requests a month on free, then $10 per 25,000
Role-based access control requires Pro at $12 per user per month
SSO, SCIM and vault integrations are Enterprise only at $45 per user per month
Working without an account is limited to the local-only Scratch Pad

Pricing, plan by plan

ESLint

Free

No published plan breakdown. See the ESLint review.

Insomnia

Free

EssentialsFree
- unlimited Cloud/Local projects
- up to 3 users with Git Sync
- 1,000 mock server requests/month
Pro$12/user/month
- unlimited users with Git Sync access
- unlimited organizations
- role-based access control
Enterprise$45/user/month
- Kong Konnect integration
- SSO (SAML/OIDC)
- SCIM provisioning

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 Insomnia if

You need rest api client.
You want to start without paying.
You work on Windows, MacOS, Linux, Web.
You also want graphql support.

Insomnia review

Questions people ask

Is ESLint or Insomnia better?: Neither clearly leads. ESLint starts at Free and Insomnia at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, ESLint or Insomnia?: ESLint starts at Free and Insomnia at Free.
Does ESLint or Insomnia run on more platforms?: ESLint runs on Browser-based JavaScript, Node.js, Any JavaScript environment. Insomnia runs on Windows, MacOS, Linux, Web.
Can I use ESLint for free?: Both have a free tier, so you can try either at no cost before committing.
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 Insomnia is typically brought in for.
What can ESLint do that Insomnia cannot?: Insomnia covers REST API Client, GraphQL Support, gRPC Support, GitHub.

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

Insomnia: How much does Insomnia cost?

Insomnia offers a free Essentials plan. Pro plans cost $12 per user per month with annual billing offering 17% savings. Enterprise plans cost $45 per user per month with support for up to 50 users self-serve; contact sales for larger teams.

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

Insomnia: Is there a free version of Insomnia?

Yes, the Essentials plan is free and includes unlimited Cloud and Local projects, Git Sync for up to 3 users, 1,000 mock server requests per month, Inso CLI, E2EE, custom linting, plugins, and AI features.

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

Insomnia: What mock server request limits apply to Insomnia plans?

Essentials includes 1,000 mock server requests per month. Pro includes 10,000 requests per month. Enterprise includes unlimited mock server requests. Additional mock server requests beyond plan allowances cost $10 per 25,000 requests.

Source

ESLint vs Insomnia

ESLint

Insomnia

The short version

Where they differ

What each one covers

Only in ESLint

Only in Insomnia

What people use each for

ESLint

Insomnia

Where each one falls short

ESLint

Insomnia

Pricing, plan by plan

ESLint

Insomnia

Which should you pick?

Choose ESLint if

Choose Insomnia if

Questions people ask

Answered from the vendors’ own pages

Related pages

More on ESLint

More on Insomnia

Keep looking

Other head to heads