Perform website responsive test online across 50+ device viewports


LambdaTest is now
TestMu AI
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."
Mobile emulators and simulators offer a glimpse, but they fall short in mimicking real-world scenarios. Don't settle for emulations/simulations; choose real device.

Use all Chrome browser features like settings and APIs, having better OS integration, accessing latest Chrome DevTools.
Choose from a wide range of devices and effortlessly interact and test responsiveness across multiple device viewports.
Enhance your mobile view debugging with built-in Chrome dev tools for each device viewport, enabling faster debugging.
LT Browser lets you record the entire screen or a specific tab in tablet or mobile view and easily share it with your team.
Get access to concise lighthouse report for viewing your website's key performance metrics, including accessibility score and SEO.
LT Browser's user-friendly interface, quick documentation, and hot reloading ensure seamless code updates in device viewports.
Ensure seamless user experience by checking your mobile view website's responsiveness on various network profiles.
Create and share responsive bug reports seamlessly across preferred project management or messaging tools.
Developers using LT Browser access their test history for informed decisions and clear site cookies via Chrome settings.
Test AI agents such as chatbots and voice assistants to ensure efficiency, relevancy, and performance.More about AI Agent Testing

Users
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Tests
1.2B+
Enterprises
10K+
Countries
132
Recognized in Gartner's Magic Quadrant 2025 as a Challenger for strong customer experience.

Featured in Forrester's Autonomous Testing Platforms Landscape, Q3 2025 for innovation in AI-driven testing.

We protect your data and AI systems with global security, privacy, responsible AI, and ESG standards, backed by certifications.

TestMu AI is #1 choice for SMBs and Enterprises across the globe.

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
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