Decode AI-Powered Quality Engineering from AI & QA Leaders,Register for Free!
Cross Browser Testing on macOS Big Sur Browsers Online
Test Online for Free on Latest and Old macOS Big Sur Browsers for Cross Browser Compatibility
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."
Live Interactive Testing on macOS Big Sur Browsers
Free online tool to ensure compatibility of your website or webapp on all latest and old macOS Big Sur browsers. With LambdaTest you can perform real time live interacting testing of your website or webapp on real macOS Big Sur machines running real Chrome, Safari, Opera, and Firefox browsers.
All macOS Supporting Browsers
Mark as a Bug
You can mark bugs to your favorite project management tool directly from LambdaTest platform even while running a session. With native LambdaTest integration support, now you can integrate in a single click your project management tools like Jira, Asana, Trello, Github, Gitlab, Bitbucket etc, along with team communication tools like Slack.
View All Integrations
Test Your Locally Hosted Webapps on macOS Big Sur Browsers
You can also test your locally hosted or privately hosted websites or webapps on LambdaTest platform via Lambda Tunnel. You can securely connect your private or local hosting servers with LambdaTest macOS Big Sur cloud machines through secure shell tunneling protocol via LambdaTest Tunnel.
Get Started For Free
Other Browsers to choose from
You can choose from a range of 3000+ desktop & mobile browsers, to get pixel perfect experience across all screen sizes, devices, OS, browsers & resolutions.
Check out all browsersTrusted by Top Support Teams Worldwide
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
More Reasons to Love TestMu AI
Users
2M+
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.
Enterprise-Grade Security, Privacy, AI Governance & ESG
We protect your data and AI systems with global security, privacy, responsible AI, and ESG standards, backed by certifications.
Wall of Fame
TestMu AI is #1 choice for SMBs and Enterprises across the globe.
As Seen On
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
TestMu AI forEnterprise
Get access to solutions built on Enterprise
grade security, privacy, & compliance
- Advanced access controls
- Advanced data retention rules
- Advanced Local Testing
- Premium Support options
- Early access to beta features
- Private Slack Channel
- Unlimited Manual Accessibility DevTools Tests