UICheck
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See what changed since the version you approved

When a project looks right, approve it as the baseline. Every later run compares each page and screen size pixel by pixel and shows the change side by side, as a diff and in the PDF report. No test scripts, no SDK: it works on any site you can check.

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Included in Lens and Prism · Free plan to try UICheck, no card needed

How it works

  1. 1

    Save the site as a project

    Its pages, screen sizes and settings are kept, so every run checks the same thing.

  2. 2

    Approve a baseline

    On a check that looks right, approve all screens, or just the ones you want.

  3. 3

    Run again after changes

    Each screen shows how much changed, where, and the before and after. Approve the new look in one click.

What it catches

  • A section that moved, grew or disappeared
  • Colour, font and image changes you didn’t mean to ship
  • Pages that got taller or shorter
  • Optional: fail the quality gate when a screen changed

Questions

Do I need to write tests?

No. Visual baselines work on the projects you already check: approve once, compare on every run, by hand, monitoring or CI.

What about sliders, dates and other moving content?

Mask them in the project’s page preparation; masked areas are drawn as boxes so they never count as changes.

How much change counts?

A screen counts as changed above 1% of its pixels by default; set your own threshold per project.

More answers in the FAQ

More ways to check

Breakpoint sweep

Find every width where your layout breaks

Safari & Firefox

Test your website on Safari without a Mac

Figma comparison

Compare your website to the Figma design

Full-site checks

Check every page of your website before launch

Integrations

Send every bug where your team already works

Fix verification

Know a bug is really fixed, without checking it yourself

Review mode

Walk through the site on every device at once

Client feedback

Feedback from clients, in the same place as the bugs

Change alerts

Know when your sites change, and if it broke something

Teams

QA your client sites as a team

CI / deploys

Check every deploy before your client does