CometWeb tools
Responsive test
Popular viewports · max 4 iframes · free layout audit
Enter a public URL and choose sizes. Preview the layout, then run a separate test for selected DOM issues. This is not real-device emulation.
4 sizes selected. Deselect a device to add another. The All filter shows the full list.
Mobile
Tablet
Desktop
Canvas waiting for a URL
Pick up to 4 devices, enter an address and click Preview. Full screen width, and zoom and scroll fit the view.
One URL. Many viewports.
DevTools shows one viewport at a time. Checking many phones and desktops means constant switching.
Pick up to 4 devices, each is an iframe. Zoom fits the preview.
The Audit button fetches the page through the CometWeb proxy and measures its DOM in your browser: horizontal scroll, viewport meta, touch targets and tiny text.
If the site blocks iframes, preview may go through the CometWeb proxy.
Check states between breakpoints
Compare a narrow phone, a wider screen and desktop, then inspect intermediate widths in DevTools too. Open menus, long forms and error messages. A static page view cannot expose every layout problem.
Common breakpoints
- 320–430Mobile portrait
- From iPhone SE to large Androids. Smallest popular viewport: 320px.
- 744–1024Tablet
- iPad Mini to iPad Pro. Two-column layouts often break here.
- 1280–1920Laptop & Desktop
- Laptops and FHD. Check max-width and readability.
The limit protects the audited site from a burst of parallel requests.
No, it is a fast multi-viewport overview.
We proxy when possible. Some sites still will not embed.
What else might come in handy
Automated WCAG 2.2 tests with a fix list and an action plan.