Rstest vs Karma

Rstest8.7Visit Karma8.3Visit

Higher score Rstest #3 in JavaScript Testing Frameworks 8.7/10 Free plan Free plan✓ 4 of 4 features Visit Rstest

vs

Karma #5 in JavaScript Testing Frameworks 8.3/10 Free plan Free plan✓ 3 of 4 features Visit Karma

• Rstest fits best

  Teams wanting a broad Rspack-based test platform

• Karma fits best

  Teams running JavaScript tests across real browsers

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Side by side

Feature	Rstest 8.7/10 Visit ↗	Karma 8.3/10 Visit ↗
At a glance
Editor score	8.7	8.3
Ranking	#3 in JavaScript Testing Frameworks	#5 in JavaScript Testing Frameworks
Best for	Teams wanting a broad Rspack-based test platform	Teams running JavaScript tests across real browsers
Pricing model	Free	Free
Starting price	Free plan	Free plan
Free plan	✓	✓
Free trial	—	—
Support	Docs	Community, Docs
Built for	Solo, Small business, Mid-market, Enterprise	Solo, Small business, Mid-market, Enterprise
Features Rstest 4/4 · Karma 3/4
Component testing	✓	✓
Coverage reporting	✓	✓
Snapshot testing	✓ (best)	Not checked yet
Parallel execution	✓	✓
Specs
Supported runtimes	Node.js, Bun, Deno, browser	Node.js
Parallel workers	Not checked yet	Not checked yet
Our review
Pros	Covers Node.js, DOM, and real-browser testing in one framework Combines React component testing with Playwright-driven end-to-end tests Includes coverage, snapshots, sharding, mocking, and parallel workers	Runs JavaScript tests in multiple real browsers Supports watch mode, coverage, plugins, and parallel execution Works with Jasmine, Mocha, QUnit, and Istanbul
Cons	Its strongest fit is teams already working with the Rspack ecosystem Browser Mode component testing adds a browser-focused testing workflow Configuration breadth may exceed the needs of small, single-project test suites	The project is deprecated and accepts no new features General bug fixes are no longer accepted Requires Node.js, browser configuration, and plugin setup
Our verdict	Rstest is an open-source JavaScript and TypeScript testing framework for applications, libraries, and multi-project repositories. Built on Rsbuild and Rspack, it uses Rspack-based test bundling with SWC transforms and supports Node.js,… Read the review →	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 →

Strengths and trade-offs

• Rstest — where it wins

  • Covers Node.js, DOM, and real-browser testing in one framework
  • Combines React component testing with Playwright-driven end-to-end tests
  • Includes coverage, snapshots, sharding, mocking, and parallel workers

  Where it doesn't

  • Its strongest fit is teams already working with the Rspack ecosystem
  • Browser Mode component testing adds a browser-focused testing workflow
  • Configuration breadth may exceed the needs of small, single-project test suites

• 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

• Rstest8.7/10 · Free plan

  A broad, open-source test platform for Node, DOM, browser, and React component testing.

  Visit RstestFull verdict →
• Karma8.3/10 · Free plan

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

  Visit KarmaFull verdict →