SEO
Test website on multiple devices
Test a website on multiple devices at once with a free Chrome extension. Side-by-side phones and tablets with sync scrolling.
Why MSIM
MSIM helps you test a website on multiple devices simultaneously. Ideal for frontend developers validating breakpoints before deployment.
Key benefits
- Find responsive bugs in seconds
- Compare multiple devices side-by-side
- Validate mobile layouts before deployment
- Reduce repetitive DevTools switching