Versionista is an online service that alerts you when a Web site changes. It shows you what's been added & removed to any Web page. It records a full page screenshot, and lets you use powerful inclusion/exclusion filters.
Versionista was designed for the rough-and-tumble world of today's Web, where subtle edits can offer actionable tactical advantage. It lets you monitor entire Web sites and receive e-mail alerts when changes that meet your filters are met. It tracks and archives any entity's total online presence, including social media, blogs, and other Web sites. It lets you follow the evolution of any site, and know when important changes occur — even to deeply nested pages.
Versionista simplifies and automates Web site monitoring:
Spider specified sites at configurable frequencies.
Track and archive changes that match your content filters.
E-mail you change alerts.
Offers a dashboard of sortable lists of monitored pages.
Provides "before and after" side-by-side comparisons.