SnapDiff: visual regression testing without CI setup.

Capture before-and-after screenshots, highlight pixel differences, annotate issues, and export clear feedback. A local browser extension for manual visual QA, with no account, backend, or pipeline to set up.

See What Pro Adds

20 Free workflows per month. Screenshots stay in your browser.

Desktop browser compatibility for
  • Chrome
  • Edge
  • Brave
  • Opera
  • Vivaldi
  • Firefox

Browser support

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Screenshot diffs and visual QA, in one extension.

For QA engineers, developers, UI/UX designers, and product reviewers. All five capabilities are in Free on Chrome within 20 completed workflows per month. Firefox has a limited feature set.

Before-and-after screenshot comparison

Compare two versions side by side, then use pixel Diff even when image sizes differ. Before and after, staging and production, expected and actual.

Explore A/B comparison

Localization testing

In Chrome, simulate browser locales on sites that support them. Review text wrapping, overflowing labels, and date or number formatting. This does not translate the page; locale simulation is unavailable in Firefox.

Explore language simulation

Responsive testing

In Chrome, choose phone and tablet presets or enter a custom viewport width and height. Compare layouts in A/B or Multi, not physical devices or other browser engines. Responsive capture is unavailable in Firefox.

Explore responsive capture

Accessibility testing

Run optional local axe checks alongside a capture, review affected elements, and export a JSON report. Available in Chrome and Firefox. Findings support manual review; they do not certify accessibility compliance.

Explore accessibility checks

Visual UI review and annotation

Review components, spacing, alignment, and visual regressions. Mark the exact issue with arrows, rectangles, pen strokes, and text, then export a clear visual handoff.

Explore visual review and annotation

Compare screenshots, annotate changes, export the evidence.

  1. Capture

    Grab the viewport, the full page, or a selected area. Keep the original pixels, not a resized copy.

  2. Compare

    Capture A, switch tabs, capture B. Review side by side or highlight pixel differences, even when sizes differ. Multi groups 2–5 images.

  3. Annotate

    Add arrows, rectangles, pen marks, and text to an image or across a side-by-side comparison. Your annotations save locally.

  4. Export

    Download an annotated PNG, JPEG, or WebP at full quality, or choose an A4 PDF. Comparisons stay side by side; long PDFs continue across pages.

Keep saved captures in your local library and return to them later to review, annotate, or export. Start new captures from the extension toolbar.

Before-and-after comparison guideVisual regression review without CI

Start free. Upgrade for unlimited workflows.

Both plans include the capture and review tools supported by your browser, with full-quality exports. Pro adds unlimited workflows, clean or custom watermarks, and timestamp controls for 12 months, with no automatic renewal.

Free

$0no subscription

Local visual review, with a monthly workflow allowance and browser-specific limits.

  • 20 completed workflows per month
  • All five tools on Chrome; limited features on Firefox
  • Full-quality capture, annotation, and export
  • SnapDiff watermark and capture timestamps
  • No account or payment details needed

Install from your browser's official extension store.

Pro

$19.99USD / 12 months

For regular reviews and exports without SnapDiff branding.

One payment for 12 months from purchase. No automatic renewal. Taxes may apply.

  • Every testing tool in Free
  • Unlimited completed workflows
  • No SnapDiff branding
  • Optional custom watermark name
  • Show or hide capture timestamps
  • Up to 3 browser installations
Buy 12 months of Pro (opens in a new tab)

Activate your license key inside the app.

Read the plan, license, and renewal details

Screenshot comparison questions, answered.

Quick answers on features, privacy, and plans.

Explore the documentation

20 completed workflows per month, annotations, and full-quality PNG, JPEG, WebP, and PDF exports with SnapDiff branding and timestamps. All five visual QA capabilities are included in Chrome; Firefox excludes responsive presets and locale simulation.

Make your next UI review a screenshot comparison.

Capture the change, mark the issue, and export the evidence. Start with 20 Free workflows per month, with no account or CI setup.