Advanced Features

Set up visual monitoring for a page

Add a page to visual monitoring, pick a schedule, and get pixel-diff alerts when it changes.

Part of Visual monitoring — the full answer, the facts and the alternatives in one place.

Updated 2026-07-09

2 min read

visual monitoring

screenshots

change detection

Quick answer#

Open the site, go to Visual Monitoring → Add page, paste the URL, pick a check frequency, and save. Lemwatch captures a baseline screenshot and starts comparing every run.

What it does#

Captures full-page screenshots on a schedule (hourly, daily, weekly)

Compares each new capture to the last baseline using pixel + text diff

Flags changes above your sensitivity threshold as incidents

Stores every screenshot for 90 days so you can scrub the timeline

Where to find it in Lemwatch#

Site details → Visual Monitoring tab → Add page. Full path: Sites → [your site] → Visual Monitoring.

How to set it up#

Open the site and click Visual Monitoring.

Click Add page and paste the exact URL you want watched.

Choose a check frequency — hourly for high-change pages, daily for marketing pages.

(Optional) Add a CSS selector to watch a single element instead of the full page.

Click Save. The first run is your baseline; no alert fires.

FAQ#

How many pages can I monitor?#

Free: 1 page. Pro: 25 pages. Agency: 100 pages. LTD tiers match Pro/Agency.

Yes — add auth cookies under Advanced → Session on the monitored page.

Visual diff thresholds

Ignore zones

CSS selector monitoring

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Visual diff thresholds explained

Tune how sensitive visual monitoring is — from tiny pixel shifts to major layout changes.

Ignore zones for visual monitoring

Mask ads, cookie banners, or rotating widgets so visual monitoring only alerts on real changes.

Monitor a single element with CSS selectors

Watch only a pricing table, headline, or button by scoping visual monitoring to a CSS selector.

Change Detection & Volatility Alerts

Detect sudden performance changes and content modifications.

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