Is TestMu AI free for open source projects?

Yes. The free plan includes limited live interactive sessions each month that renew monthly, plus automated screenshot runs. No credit card is required to sign up, so contributors can start testing in minutes.

Which open source frameworks does the grid support?

Selenium, Playwright, Cypress, and Puppeteer all run on the grid. Keep your suite as it is and change only the connection endpoint; every language binding that speaks WebDriver or CDP works.

How do I run cross browser tests in GitHub Actions?

Store your username and access key as repository secrets, export them in the workflow, and run your usual test command, as in the excerpt on this page. For locally hosted builds, start the TestMu AI Tunnel GitHub Action before the test step.

What is pairwise testing?

Pairwise (all-pairs) testing selects the smallest set of configurations in which every pair of values, such as Safari plus macOS or Chrome plus 1920x1080, appears at least once. It usually needs only a fraction of the full browser-OS-resolution matrix while still catching the interaction bugs that matter, which keeps open source CI minutes low.

Free Cross Browser Testing Tool For Open Source Projects

Run your Selenium, Cypress, and Playwright suites, automated screenshots, and visual checks on 10,000+ browsers and real devices, free for open source.

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Point Your Open Source Suite at the Grid

Keep your tests exactly as they are: store LT_USERNAME and LT_ACCESS_KEY as CI secrets and change only the connection endpoint.

Testing a locally hosted build? Start the tunnel action first. Check out our documentation

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Everything Open Source Projects Get for Free

CI runs, bulk screenshots, pairwise-optimized coverage, and AI interface testing on one grid.

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CI/CD PIPELINES

Run Tests From CI

Trigger your suite from GitHub Actions or GitLab CI on every push and pull request, and watch sessions, logs, and videos in the TestMu AI dashboard.

Run Your First CI Build

Store credentials as CI secrets, never in the repo
Same endpoint works for Selenium, Playwright, and Cypress
Up to 70% faster suites with HyperExecute parallel runs

VISUAL COVERAGE

Bulk Screenshot Testing

Capture full-page screenshots of any URL across dozens of browser, OS, and resolution combinations in one run, then compare builds against an approved baseline.

Capture Screenshots Free

Full-page captures across desktop and mobile viewports
Visual diffs highlight CSS regressions automatically
Responsive checks across custom viewport sizes

SMART COVERAGE

Pairwise Test Coverage

Three browsers, four operating systems, and five resolutions is already 60 runs. All-pairs selection covers every pair of values in a fraction of the matrix.

Optimize Your Matrix

Cover every browser-OS pair at least once
Encode the reduced matrix as your capability list
Run the set in parallel to keep CI minutes low

AI INTERFACES

Test AI App Frontends

Model evaluation libraries such as Giskard check the LLM layer. The chat widget, streaming, and markdown rendering still need cross browser UI coverage.

Explore Agent Testing

Verify streaming responses and markdown rendering
Script chat flows with Selenium, Playwright, or Cypress
Cover the conversation layer with agent testing

Open Source Frameworks on the Grid

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Every major open source test runner connects to the cloud grid without rewrites.

Runs on TestMu AI

Typical use

Selenium

Yes, remote WebDriver grid

Cross browser E2E in any language binding

Playwright

Yes, CDP connection

Fast modern E2E on Chromium, Firefox, WebKit

Cypress

Yes, CLI runner

Component and E2E tests in JavaScript

Puppeteer

Yes, CDP connection

Headless Chrome automation and scraping checks

Success Stories of TestMu AI (Formerly LambdaTest)

50%

reduction in test execution time

“HyperExecute is a highly reliable test execution platform and has excellent customer support.”

Sagar Uday Kumar

Sr. Engineering Manager

Some Love from our Customers

As Best Egg expanded its product offerings and entered new markets, we knew our old testing infrastructure couldn’t keep up.
With support from Tenny Agustin, our Engineering Operations Lead, we modernized our approach with

TestMu AI

Best Egg

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Excited to Share My Learning Journey with Kane AI & Lambda Tool!
I'm pleased to announce that I've recently gained hands-on experience exploring Kane AI through the Lambda Tool and it’s been a fantastic journey of upskilling!

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Suryateja Goud

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See how is #Futureready to enable blazing-fast test orchestration seamlessly integrated with organizations' existing CI/CD platforms, using #Microsoft Azure.

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Microsoft India

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See how TestMu AI speeds up your testing with AI-native authoring, faster execution, and deeper test insights across web, mobile, and AI applications.

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