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Head-to-head · JavaScript Testing Frameworks

Karma vs Intern

  • Updated Oct 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score Karma #5 in JavaScript Testing Frameworks 8.3/10 Free plan Free plan✓ 3 of 4 features Visit Karma
Intern #8 in JavaScript Testing Frameworks 7.8/10 Open source ✓ 2 of 4 features Visit Intern

Karma leads on 0 checks, Intern on 0, and 4 are even. Who comes out ahead on the 4 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreKarma · 8.3/10
  • Free planonly Karma
  • Most featuresKarma · 3 of 4

Karma scores higher on our rubric for javascript testing frameworks: 8.3 against 7.8 out of 10; our editors rank them #5 and #8.

Karma is the better fit for teams running JavaScript tests across real browsers. Intern is the better fit for teams testing web, Node.js, and mobile applications.

  • Karma fits best

    Teams running JavaScript tests across real browsers

  • Intern fits best

    Teams testing web, Node.js, and mobile applications

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Side by side

Feature Karma 8.3/10 Visit ↗ Intern 7.8/10 Visit ↗
At a glance
Editor score 8.3 7.8
Ranking #5 in JavaScript Testing Frameworks #8 in JavaScript Testing Frameworks
Best for Teams running JavaScript tests across real browsers Teams testing web, Node.js, and mobile applications
Pricing model Free Free
Starting price Free plan Open source
Free plan ✓ (best) Not checked yet
Free trial — —
Deployment Self-hosted Self-hosted
Platforms Web, Windows, macOS, Linux Web
Support Community, Docs Community, Docs
Integrations 4 integrations 9 integrations
Built for Solo, Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features Karma 3/4 · Intern 2/4
Component testing ✓ (best) Not checked yet
Coverage reporting ✓ ✓
Snapshot testing Not checked yet Not checked yet
Parallel execution ✓ ✓
Specs
Supported runtimes Node.js Node.js, web browsers
Parallel workers Not checked yet Not checked yet
Our review
Pros
  • Runs JavaScript tests in multiple real browsers
  • Supports watch mode, coverage, plugins, and parallel execution
  • Works with Jasmine, Mocha, QUnit, and Istanbul
  • Covers unit, functional, browser, and native or hybrid mobile testing
  • Supports coverage reporting, TypeScript, parallel execution, and CI workflows
  • Connects with WebDriver, cloud testing services, Selenium, and Appium
Cons
  • The project is deprecated and accepts no new features
  • General bug fixes are no longer accepted
  • Requires Node.js, browser configuration, and plugin setup
  • Requires familiarity with Node.js, browsers, and WebDriver-compatible services
  • Its broad scope may be more than needed for unit testing alone
  • User guidance spans Intern v1–3 while the repository describes Intern 4 compatibility
Our verdict

Karma is an open-source JavaScript test runner for teams that need to execute browser-based tests in connected real browsers. Installed as an npm package, it runs on Node.js and launches a local web server for test execution. Karma can…

Read the review →

Intern is an open-source JavaScript testing system for libraries, applications, web pages, and native or hybrid mobile applications. It supports unit testing in Node.js and browsers, functional testing through WebDriver-compatible…

Read the review →
  1. KarmaJavaScript Testing Frameworks 8.3Free plan
  2. InternJavaScript Testing Frameworks 7.8Open source

Strengths and trade-offs

  • Karma — where it wins

    • Runs JavaScript tests in multiple real browsers
    • Supports watch mode, coverage, plugins, and parallel execution
    • Works with Jasmine, Mocha, QUnit, and Istanbul

    Where it doesn't

    • The project is deprecated and accepts no new features
    • General bug fixes are no longer accepted
    • Requires Node.js, browser configuration, and plugin setup

  • Intern — where it wins

    • Covers unit, functional, browser, and native or hybrid mobile testing
    • Supports coverage reporting, TypeScript, parallel execution, and CI workflows
    • Connects with WebDriver, cloud testing services, Selenium, and Appium

    Where it doesn't

    • Requires familiarity with Node.js, browsers, and WebDriver-compatible services
    • Its broad scope may be more than needed for unit testing alone
    • User guidance spans Intern v1–3 while the repository describes Intern 4 compatibility
  • Karma8.3/10 · Free plan

    A flexible open-source runner for real-browser tests, but its deprecated status limits future use.

    Visit KarmaFull verdict →
  • Intern7.8/10 · Open source

    An open-source JavaScript testing system with broad browser, mobile, and CI coverage.

    Visit InternFull verdict →

More comparisons

All JavaScript testing frameworks comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update