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Review of Page Monitor for Chrome powered by the Slant community.
Web service and Chrome extension to monitor websites visual changes.
SpecsUpdate
Running onChrome extension / Cloud
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Pros
Pro Free
Pro Monitors visual changes of a region, as opposed to textual changes
Pro Can track unlimited number of pages
Pro Can be set to send desktop notification and use a sound for notifications
Pro Highlights changes since last check
Cons
Con Not exactly free
Only 2 pages per day are free.