Cross Browser Testing Online on 3,000+ Real Browsers
Every browser breaks something different, TestMu AI (Formerly LambdaTest) finds all of it. Live browser testing, parallel automation, visual regression, and responsive testing - all in one place, across every browser, device, and OS your users are on.
Automate Browser Flows from your
Terminal with Kane CLI
Trusted by 2M+ users globally at
"We have tripled our tests and are now executing tests in less than 2 hours with 78% Faster Test Execution"
"We figured out a more efficient way to monitor system health and resolve failures earlier in lower environments."
"TestMu AI has significantly boosted our testing speed, is easy to implement, and provides exceptional support."
"With 70% faster test execution, TestMu AI helped us achieve faster time-to-market and enhanced CX."
More Browsers in Testing. Fewer Bugs in Production.
TestMu AI covers every dimension of how real users experience your product, from rendering engines to network conditions to pixel-level visual diffs.
Catch bugs before your users do.
A live, interactive session where you click, scroll, and fill forms to see how every browser handles each interaction.
Start a live browser session freePick the browser, version, and OS combination a user reported a bug on and reproduce it exactly. No guesswork about what the user's environment looked like.
Native Chrome DevTools and Safari Web Inspector are embedded directly in every TestMu AI session. Inspect the DOM, trace network requests, read console errors, and profile rendering performance all without switching tabs or losing the session.
Test 3,000+ browser-OS combinations - Chrome, Safari, Firefox, Edge, Brave, Opera, across Windows, macOS, Linux, iOS, and Android, in every major version. Including older versions that a lot of your users still run.
Run 100 browsers in parallel.
Point your existing suite at TestMu AI's HyperExecute to run every browser combination at once, up to 70% faster.
Run your first parallel browser testDescribe what to test in plain English. KaneAI writes it. It also self-heals broken selectors when your UI changes keeping coverage accurate without maintenance overhead.
HyperExecute runs up to 100 browser-OS combinations simultaneously. A test run that takes 5 hours sequentially completes in under 30 minutes. Same tests, same pipeline, 70% faster.
If your team runs Playwright, you're two minutes from running it across 3,000+ browsers on TestMu AI. Fully compatible with Selenium WebDriver, Cypress, Playwright, and Appium. Switching requires updating one configuration file i.e. your remote WebDriver endpoint URL.
Every browser, every viewport.
Visual regression testing automatically flags CSS, layout, and animation differences across every browser on every build, with no manual review.
Catch your first visual regression freeElements moving by 1px, structural changes, font rendering differences, color variations, and responsive breakpoint failures - all flagged automatically.
Chrome uses Blink. Safari uses WebKit. Firefox uses Gecko. Sticky positioning, full-screen height on iOS, CSS grid gaps, scroll-driven animations - all behave differently. TestMu AI flags every one automatically on every build.
From Ad slots, live timestamps to rotating carousels, mark any region as excluded with one click. Only the stable UI elements you care about are compared, eliminating false positives from content that is supposed to change.
Everything Cross-browser Testing Should Cover
Cross-browser bugs hide in rendering engines, screen sizes, network conditions, and visual layouts. TestMu AI catches all of them.
Debug live in Chrome DevTools or Safari Web Inspector without leaving your test session. Inspect DOM, trace network requests, read console errors, and profile performance in the same environment your users have.
Switch between 25+ desktop screen resolutions instantly from 1024x768 to 2560x1440. See exactly how your layout responds without resizing your local browser.
Open up to 6 real devices simultaneously and compare how the same page renders across an iPhone 15, Samsung Galaxy S24, iPad Pro, and Windows desktop, side by side, in real time.
Simulate 2G, 3G, 4G, LTE, offline, and custom latency conditions to verify your application performs acceptably for users on slow or unstable connections.
Test from 45+ geoIPs to verify region-specific content, currency formatting, language detection, and geo-restricted features work correctly for users in different countries.
Catch pixel-level shifts, DOM-level structural changes, font rendering differences, and Safari WebKit layout bugs before your users do.
Automated Cross Browser Testing with Selenium, Playwright & Cypress
Bring your existing suites and run them unchanged across 3,000+ real browser and OS combinations in parallel, with native support for Selenium, Playwright, Cypress, Puppeteer, and 50+ frameworks.
Native Real OS Environments
Every session runs on production-representative operating systems, not headless mocks, so rendering matches what your users actually see.
macOS Sequoia
Real Safari and WebKit on Apple silicon.
Windows 11
Chrome, Edge, and Firefox on the latest Windows.
Ubuntu Linux
Headless and headed runs on real Linux.
Android
Chrome and native browsers on real devices.
iOS
Safari on real iPhones and iPads.
AI-Native Cross Browser Visual Testing
Pixel-level diffing on every build catches layout breaks across the three rendering engines that power every browser. Explore AI visual testing.
Chromium (Blink)
Chrome, Edge, Opera, and Brave. Catch flex and grid gaps before release.
WebKit
Safari on macOS and iOS. Flag sticky positioning and viewport-height bugs.
Gecko
Firefox. Surface scroll-driven animation and font-rendering drift.
Everything your live testing session needs, built in.
Launch a session in seconds
Type a URL, pick a browser, hit Start. No timers, no VMs, no IT tickets.
Responsive testing across screen sizes
Automatically repair broken locators, reduce flakiness, and cut test maintenance time significantly.
Console, network & render logs
Capture errors, requests, and render timing automatically. No broken-share required.
Spot issues? Mark as bug
Spot an issue? Mark it as a bug instantly, add annotations, and push it straight to Jira, Slack, or your favourite tool.
Multi-browser side-by-side
Open six mobile browsers side by side on the same flow. Spot UI drift fast.
Test on your Dev environment
Run dev, staging, or local apps live in TestMu via LambdaTest tunnel. Secure, auto-renew, no VPN.
2M+
developers & QA engineers
3,000+
real browsers & OS combos
70%
faster test execution
$15/mo
to get started vs $39 elsewhere
Get Started with your First Cross-browser Test
Blog
Walkthrough on performing cross browser testing with TestMu AI across real browsers, devices, and OS.
Live interactive browser testing
Get started with live cross browser sessions on virtual browsers or run them directly on real devices.
Automated browser testing
Run automated Selenium, Playwright, and Cypress suites in parallel on the cross browser testing cloud.
More coverage. Less cost. No maintenance.
No infrastructure to manage
No machines, no browser matrix, no maintenance. Hand off your entire testing infrastructure to TestMu AI's cloud grid.
70% faster test execution
HyperExecute co-locates tests with browsers, cutting the network hop that slows remote grids. Two-hour runs become 15-minute cycles.
Starts at $15/month
3,000+ browser-OS combinations, parallel execution, and KaneAI, at less than half the price of others.
Browser-specific Cross-crowser Testing
Deep-link straight into the live grid for the browser you need. Each page covers the full version matrix, supported OS hosts, and DevTools support.
AI-Agentic Quality Engineering
Agent Testing
AI agents need testing too. Catch failures in your chatbots and voice assistants before real users do.
More about Agent Testing
Autonomous Testing
Detailed agent analysis under test, from the perspective of a synthetic end-user.
Multi-persona Simulation
Diverse user personas like International Caller, Digital Novice and more.
Risk Scoring & Regression
End to end regression testing for agent under test with insights.
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
best-egg
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!
KaneAI
Suryateja Goud
suryateja-goud
See how is #Futureready to enable blazing-fast test orchestration seamlessly integrated with organizations' existing CI/CD platforms, using #Microsoft Azure.
TestMu AI
Microsoft India
MicrosoftIndia
More Reasons to LoveTestMu AI (formerly LambdaTest)
See how TestMu AI speeds up your testing with AI-native authoring, faster execution, and deeper test insights across web, mobile, and AI applications.
TestMu AI Named a Challenger in the 2025 Gartner® Magic Quadrant™
Read ReportTestMu AI recognized in The Forrester Wave™: Autonomous Testing Platforms, Q4 2025
Read ReportWall of Fame
TestMu AI is #1 choice for SMBs and Enterprises across the globe.
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Integrations
Works where you work, 120+ integrations with the tools your team relies on.
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Tests
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Enterprises
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Countries
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