Visual website monitoring that shows the before and after, not just a red box

SiteGauge captures a full-page screenshot every time a check confirms a real change, then lets you compare the two states with a slider, side by side, fade, or difference overlay. Each change comes with an AI importance score, so you know why it matters.

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Screenshot on every confirmed change Desktop and mobile capture available
Visual change confirmedExample
BEFOREAFTER
AI summary7 / 10

The hero banner was recoloured and its call to action moved. A messaging refresh worth comparing against your own landing page.

Full-page
Screenshot on every confirmed change
4 views
Slider, side by side, fade, difference overlay
Desktop + mobile
Viewport capture available per monitor
AI-scored
Every visual change explained, not just flagged

See it capture your own page

Paste any URL and watch SiteGauge take a screenshot. Pick the area to track and set an alert, right here. No sign-up needed to look.

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What visual monitoring captures

A screenshot is only useful when you can compare it, control the noise, and understand it. Point a page monitor at anything visual and SiteGauge handles the rest.

Full-page screenshots

Every confirmed change triggers a fresh full-page render, top to bottom, not just what sits above the fold.

Page monitoring

Desktop and mobile

Capture the desktop view, the mobile view, or both. Multi-viewport capture is available as a per-monitor option, not every monitor by default.

Website monitoring

Ignore rules to cut noise

Exclude carousels, ad slots, live timestamps, and cookie banners with CSS selectors, so cosmetic shifts do not fill your inbox.

Change alerts

Visual change history

Every screenshot and diff is kept for your plan's history window, so you can scrub back through how a page looked over time.

Change monitoring in practice

AI importance scoring

Each visual change is categorised and scored on every plan, unmetered, so a hero swap that matters rises above a reshuffled footer.

See the platform

Coming from Visualping?

See how SiteGauge pairs the same pixel comparison with AI importance scoring and a text and SEO diff.

Visualping alternative

Four ways to see the difference

The before and after screenshots for any change open in whichever comparison view makes the shift clearest.

Slider

Drag a handle across the frame to reveal before on one side and after on the other.

Side by side

The two captures set next to each other so you can scan both states at a glance.

Fade

Cross-fade from the old screenshot to the new one to spot exactly what moved.

Difference overlay

Highlight only the pixels that changed, so the altered region is impossible to miss.

How visual change monitoring works

A two-stage crawl keeps it cheap: a light check runs on your schedule, and the full render and screenshot only fire when there is a real change to see.

01

A cheap check runs on your schedule

A lightweight fetch and hash check runs as often as your plan allows, from daily to as fast as every 2 minutes, watching the underlying page.

02

A screenshot is captured on a real change

When that check confirms something moved, SiteGauge loads the page in a real browser and takes a fresh full-page screenshot to compare against the last one.

03

You compare, read the why, and get alerted

Open the before and after in any view, read the AI summary that scores and explains the change, and receive the alert on your channels.

A red box is not an answer

Plenty of tools can tell you pixels moved. SiteGauge pairs the pixel comparison with meaning, so a visual change arrives with the why attached.

Pixel-level visual diff

See the exact region that moved through a difference overlay, slider, side by side, or fade view of the two full-page captures.

AI importance score

Every change is categorised as pricing, messaging, product, or SEO and scored for importance, so the frame that matters rises to the top.

Paired text and SEO diff

The same change ships a track-changes text diff and SEO-element diff, so a visual shift arrives with the words and metadata that moved too.

Weighing up tools? Read the Visualping alternative comparison, or see the full website change alert workflow.

Who uses visual monitoring

Anyone who cares how a page looks, not just whether it loads. It sits inside the wider website monitoring platform.

Design and brand teams

Catch an unintended layout break, a broken image, or an off-brand hero as soon as the next check confirms it, before a customer screenshots it for you.

Competitive and marketing intel

Watch rival landing and pricing pages redesign in real before and after frames, and share the feed with unlimited free read-only viewers.

SEO and web teams

Pair the visual diff with SEO-element change detection, so a redesign that also drops a canonical or rewrites a title never slips through.

Stop eyeballing two tabs

Flipping between saved screenshots misses the change that mattered. A real before and after does not.

The old way

  • x Open two screenshots in separate tabs and squint
  • x Pixel-diff tools flag every cosmetic wobble
  • x A red box with no idea what actually moved
  • x No mobile view and no history to look back on

With SiteGauge

  • Before and after in one view: slider, fade, or overlay
  • Ignore rules mute the regions that always move
  • AI scores each change and explains what changed
  • Desktop and mobile capture with a full visual history

Want it by scenario? See website change monitoring in practice.

Visual monitoring FAQs

What is visual change monitoring?
Visual change monitoring captures a screenshot of a page on a schedule and shows you a real before and after comparison when something moves. It catches layout breaks, image swaps, redesigns, and other visual shifts that a plain text diff can describe but never lets you actually see. SiteGauge takes a full-page screenshot on every confirmed change and lets you compare the two states with a slider, side by side, fade, or difference overlay.
Do you compare screenshots or the code?
Both, and that is the point. A cheap check on the underlying page content runs on your schedule. When it confirms a change, SiteGauge renders the page in a real browser and captures a fresh screenshot, so you get a pixel before and after comparison alongside a track-changes text diff and an SEO-element diff. A visual change therefore arrives with the exact words and metadata that moved, not just a red box.
Which before and after views can I use?
Four. A slider you drag across the frame, a side by side layout, a fade that cross-fades between the two captures, and a difference overlay that highlights only the pixels that changed. Each view works on the same pair of full-page screenshots, so you can switch between them to confirm exactly what moved.
Can SiteGauge capture mobile as well as desktop?
Yes. Desktop and mobile viewport capture is available as a per-monitor option, so you can watch how a page renders on a phone as well as a laptop. It is a setting you turn on per monitor rather than something applied to every monitor by default.
How do I stop cosmetic changes from spamming me?
Two ways. Use CSS-selector ignore rules to exclude regions that always move, such as carousels, ad slots, live timestamps, and cookie banners, so they never trigger a capture. On top of that, every confirmed change is scored for importance by AI, so a genuine hero swap stands out while a trivial pixel shuffle stays quiet.
Is visual monitoring real-time?
No, and we will not pretend otherwise. SiteGauge checks on a schedule rather than continuously: daily on Free, hourly on Standard, every 15 minutes on Pro, every 5 minutes on Business, and as fast as every 2 minutes on Enterprise. As soon as a check confirms a real change, the screenshot is captured and you are alerted. There are no push notifications and no instant-detection promises.
Where can I see past visual changes?
Every confirmed change keeps its screenshot and diff in a visual change history for your plan's retention window, which is 30 days on Free and longer on paid plans. You can scrub back through how a page looked over time and reopen any before and after pair in the view you prefer.

See every change, not just a red box

Start free on 5 monitors with screenshots and AI summaries included. No credit card required.

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