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Screenshot capture is a Pro plan feature that saves a PNG screenshot alongside each text snapshot when a watch checks a page. This gives you both text diffs and visual comparisons.

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Enabling screenshots

  1. Open the watches list
  2. Click the gear icon on a watch to open Watch Settings
  3. Toggle Screenshot Capture on
  4. The watch automatically rechecks to capture its first screenshot
When enabled, the watch uses a browser-based fetcher so it can render the page and take a screenshot.
Screenshot capture requires the Pro plan. Free and Starter users see an upgrade prompt.

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Viewing screenshots

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Preview page

The preview page shows a Text / Screenshot tab toggle when screenshots are available. Switch to the Screenshot tab to see the most recent capture.

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Diff page

The diff page shows a Text Diff / Visual Diff tab toggle. The visual diff view offers two modes:
  • Before / After — A slider to compare the two screenshots side by side
  • Diff Overlay — A generated image highlighting changed regions in red
The change percentage and sensitivity threshold are shown below the image when available.

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How it works

  • Screenshots are additive — text monitoring always runs, screenshots are captured alongside
  • Each check saves both a text snapshot and a screenshot (if enabled)
  • At least 2 screenshots are needed before visual comparison is available
  • The diff overlay is generated on-demand using image comparison (SSIM)