Free responsive checker
See your page on desktop, tablet and mobile at once
Paste a URL or drop the HTML file your AI generated. Kenso renders it at three real device widths side by side, so layout breaks jump out. Found one? Leave a comment on that exact view.
URLs are shown as a snapshot without the site's scripts. For pages behind a login, upload the HTML file instead.
How it works
01
Enter a URL or file
A public page, or an HTML file from Claude, ChatGPT or Cursor.
02
Compare three widths
Desktop (1280px), tablet (820px) and mobile (390px), rendered for real.
03
Comment on a view
Open it in Kenso to leave comments on the mobile view, the desktop view, or both.
Questions
How do I check if my website is responsive?+
Enter the page URL above. You'll see it at desktop, tablet and phone widths side by side. Look for text that overflows, images that don't shrink, and navigation that breaks on small screens.
Which screen sizes does it test?+
1280px for desktop, 820px for tablet (an iPad Air in portrait) and 390px for mobile (a modern iPhone). These cover the breakpoints most layouts use.
Why does my page look blank?+
For a URL, Kenso shows a snapshot of the page as its server sends it, without the site's own scripts. Most sites look right that way, but apps that build everything in the browser can come out blank. Upload the HTML file instead in that case.
Can I leave feedback on the mobile view only?+
Yes. Open the result in Kenso: each width keeps its own comments, so a note about the mobile menu doesn't clutter the desktop view.
Kenso
The review home for AI deliverables
Claude, Cursor or ChatGPT push HTML, PDFs and images straight to Kenso. Your team pins comments right on them, and the AI reads the feedback back to ship v2 on the same link.