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Head-to-head · JavaScript Testing Frameworks

Karma vs Testem

  • 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
Testem #6 in JavaScript Testing Frameworks 8.1/10 Open source ✓ 2 of 4 features Visit Testem

Karma leads on 0 checks, Testem 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 8.1 out of 10; our editors rank them #5 and #6.

Karma is the better fit for teams running JavaScript tests across real browsers. Testem is the better fit for legacy-compatible browser and CI test workflows.

  • Karma fits best

    Teams running JavaScript tests across real browsers

  • Testem fits best

    Legacy-compatible browser and CI test workflows

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Side by side

Feature Karma 8.3/10 Visit ↗ Testem 8.1/10 Visit ↗
At a glance
Editor score 8.3 8.1
Ranking #5 in JavaScript Testing Frameworks #6 in JavaScript Testing Frameworks
Best for Teams running JavaScript tests across real browsers Legacy-compatible browser and CI test workflows
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 Windows, macOS, Linux
Support Community, Docs Docs
Integrations 4 integrations 5 integrations
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market
Features Karma 3/4 · Testem 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, Chrome, Firefox, Safari, Edge
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
  • Runs tests in Chrome, Firefox, Safari, Edge, and Node.js
  • Supports Jasmine, QUnit, Mocha, and custom adapters
  • Includes watch mode, parallel execution, coverage, and CI reporters
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
  • Less feature-rich as a standalone framework than broader alternatives
  • Frameworks outside its built-in adapters require custom integration
  • Parallel worker limits are configurable rather than fixed
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 →

Testem is an open-source JavaScript test runner for teams that need to execute tests across real desktop browsers, headless Chrome, Node.js processes, or custom launchers. It supports macOS, Windows, and Linux, and works with Jasmine,…

Read the review →
  1. KarmaJavaScript Testing Frameworks 8.3Free plan
  2. TestemJavaScript Testing Frameworks 8.1Open 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

  • Testem — where it wins

    • Runs tests in Chrome, Firefox, Safari, Edge, and Node.js
    • Supports Jasmine, QUnit, Mocha, and custom adapters
    • Includes watch mode, parallel execution, coverage, and CI reporters

    Where it doesn't

    • Less feature-rich as a standalone framework than broader alternatives
    • Frameworks outside its built-in adapters require custom integration
    • Parallel worker limits are configurable rather than fixed
  • Karma8.3/10 · Free plan

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

    Visit KarmaFull verdict →
  • Testem8.1/10 · Open source

    A flexible runner for real-browser, Node.js, and CI testing across common frameworks.

    Visit TestemFull 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