UICheck
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UICheck vs Polypane

Polypane is a desktop browser made for developers: it shows your site in several synced panes at different sizes while you build, with debugging and accessibility tools built in. UICheck runs in the cloud: paste a URL and get a report of every layout bug on every screen size. Polypane helps you while you write CSS; UICheck checks the result before it ships.

Side by side

What it isUICheck: Automatic responsive and layout QA for any URLPolypane: Desktop browser for developing responsive sites
How you testUICheck: Paste a URL; findings are listed for youPolypane: Browse your site in synced panes and inspect them
InstallUICheck: Nothing, runs in the cloudPolypane: Desktop app (macOS, Windows, Linux)
Automatic bug reportUICheck: Yes, every screen size, with screenshotsPolypane: Debugging and accessibility tools you run while browsing
Whole-site checkUICheck: Yes: up to 15 or 150 pages, emailed when donePolypane: Page by page as you browse
Safari and Firefox enginesUICheck: Yes (Lens and Prism)Polypane: Chromium-based panes
Report for clientsUICheck: Plain-language fixes, share link without login, PDF and ExcelPolypane: Screenshots you take yourself
Who it suitsUICheck: Agencies, freelancers, PMs, QA before launchPolypane: Front-end developers while coding

Based on public information, checked October 2026. Something changed? Tell us and we’ll update it.

Choose Polypane if

  • You are a front-end developer who wants many viewports open while writing CSS
  • You want live editing and debugging tools in one browser

Choose UICheck if

  • You want the bugs found and listed for you
  • Non-developers need to run checks or read the results
  • You want Safari and Firefox rendering checked too
  • You check whole sites before launch, not one page at a time

Or use both

Build with Polypane, then run UICheck on the staging URL before every launch as an independent check across all sizes and browsers.

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Try UICheck next to Polypane

Free account, 5 checks a day, no card. Paste a URL and see what it finds in about a minute.

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