Know the moment any web page changes.
Visual change detection
Catch the changes that matter — ignore the noise
Pixel-accurate comparison with controls to focus on the part of the page you actually care about.
Full-page screenshots
Pixel-perfect captures of any public URL — full page or viewport — on the schedule you choose.
Pixel-by-pixel diff
Each new capture is compared against the last and the exact changed pixels are highlighted for instant review.
Change sensitivity
Set a change threshold so tiny rendering noise is ignored and only meaningful visual changes trigger an alert.
Watch a single element
Target one element with a CSS selector — monitor just the price, the headline or the banner, not the whole page.
Clip to a region
Draw a bounding box to monitor a fixed region of the page and ignore everything outside it.
Cookie banners handled
Consent and pop-up banners are dismissed automatically before capture, so they never pollute your comparisons.
See exactly what changed, side by side
Every check stores a full screenshot. When something changes you get a before/after with the differing pixels highlighted — no squinting, no guessing.
- Highlighted visual diff on every change
- Full screenshot history per page
- Compare any two captures over time
Monitor the part that matters
Dynamic pages change constantly. Watch a single element or a clipped region and set a sensitivity threshold so you only hear about changes you actually care about.
- CSS-selector element targeting
- Bounding-box region clipping
- Adjustable change threshold
Alerts the moment a page moves
Get an email or fire a webhook into Slack, Zapier or your own systems the instant a monitored page changes — checks run as often as every 2 minutes.
- Email & webhook notifications
- Checks as often as every 2 minutes
- Scheduled and on-demand captures
Visual monitoring FAQ
What is visual monitoring / visual change detection?
It is automated website change monitoring based on screenshots: ViewCel captures a page on a schedule, compares each new capture to the previous one pixel-by-pixel, and alerts you when the visual appearance changes.
How do I avoid alerts for tiny, unimportant changes?
Set a change-sensitivity threshold so minor rendering noise is ignored, and/or monitor only a specific element (by CSS selector) or a clipped region instead of the whole page.
Do I need to install anything on the site?
No. ViewCel works on any public URL with no code, plugin or DNS change — including pages you do not control, such as competitors.
How often are pages captured?
Depending on your plan, as often as every 2 minutes. You can also trigger captures on demand.
Can I be notified outside of email?
Yes. Alongside email alerts, ViewCel can fire a webhook on every detected change, so you can route changes into Slack, Zapier, or your own backend.
Ready to transform your web intelligence?
Join thousands of teams using ViewCel to monitor, analyze, and act on web changes in real-time.
