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ESLint vs LaunchDarkly

ESLint logo

ESLint

Software

Find and fix problems in JavaScript code

From
Free
Rated
-
Full reviewWebsite
LaunchDarkly logo

LaunchDarkly

Software

Ship fast. Rest easy.

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: ESLint slow performance on large codebases compared to newer tools like Oxlint and Biome; LaunchDarkly pricing scales rapidly with monthly active users, becoming expensive at scale

Where they differ

Only the attributes on which ESLint and LaunchDarkly actually diverge.

Attributes where ESLint and LaunchDarkly differ
AttributeESLintLaunchDarkly
PlatformsBrowser-based JavaScript, Node.js, Any JavaScript environmentWeb, Cloud, APIs
Founded20192014

Identical on both: starting price (Free), pricing model (Unknown), free tier (Yes), user rating (Not yet rated), category (Unknown).

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 LaunchDarkly does not also cover.

Only in LaunchDarkly

  • Feature flags
  • Progressive rollouts
  • User targeting
  • A/B testing
  • Kill switches
  • Audit log
  • Multi-environment
  • SDKs for all platforms

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

LaunchDarkly

  • Progressive deliverynot ESLint
  • Feature experimentationnot ESLint
  • Risk mitigationnot ESLint
  • Performance optimizationnot ESLint
  • Infrastructure migrationnot 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

LaunchDarkly

  • Pricing scales rapidly with monthly active users, becoming expensive at scale
  • Limited seats for engineers on standard plans, forcing upgrade to enterprise
  • Advanced features like experimentation and audit logs require higher-tier plans
  • Occasional reliability issues and backend delays reported by users

Pricing, plan by plan

ESLint

Free

No published plan breakdown. See the ESLint review.

LaunchDarkly

Free
  • DeveloperFree
    • Unlimited seats
    • Unlimited feature flags
    • A/B tests and experiments
  • Foundation$undefined/mo
    • $12 per connection
    • $10 per 1K MAU
    • Targeted segmentation
  • Enterprise$undefined/mo
    • Custom pricing
    • Advanced automation
    • Compliance features

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 LaunchDarkly if

  • You need feature flags.
  • You want to start without paying.
  • You work on Web, Cloud, APIs.
  • You also want progressive rollouts.
LaunchDarkly review

Questions people ask

Is ESLint or LaunchDarkly better?
Neither clearly leads. ESLint starts at Free and LaunchDarkly at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, ESLint or LaunchDarkly?
ESLint starts at Free and LaunchDarkly at Free.
Does ESLint or LaunchDarkly run on more platforms?
ESLint runs on Browser-based JavaScript, Node.js, Any JavaScript environment. LaunchDarkly runs on Web, Cloud, APIs.
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 LaunchDarkly is typically brought in for.
What can ESLint do that LaunchDarkly cannot?
LaunchDarkly covers Feature flags, Progressive rollouts, User targeting, A/B testing.

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
LaunchDarkly: What does the free Developer plan include?

The free Developer plan includes unlimited seats, unlimited feature flags, A/B tests and experiments, 30 SDKs, 10 million logs and traces, 5,000 session replays and errors, and 14 days of data retention.

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
LaunchDarkly: How does LaunchDarkly pricing scale?

Foundation plan pricing is $12 per connection plus $10 per 1,000 Monthly Active Users (MAU). Enterprise and Guardian plans have custom pricing based on usage, advanced features, and compliance requirements.

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
LaunchDarkly: Does LaunchDarkly integrate with Jira and Slack?

Yes, LaunchDarkly integrates with Jira Cloud, allowing you to link feature flags to Jira issues and create issues from observability data. It also integrates with Slack for flag notifications and allows authorized members to trigger flag changes from Slack.

Source
LaunchDarkly: What is dark launching and how does LaunchDarkly enable it?

Dark launching keeps code changes hidden in production until ready to enable. LaunchDarkly enables this through feature flags that let teams safely test code in production before rolling out to users.

Source
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