Browsera: Automated Browser Compatibility Testing
Browsera is a automated browser compatibility testing services. Browsera automatically detects cross-browser layout problems and scripting errors on your website.
Browsera is a testing tool, not a screenshot tool, and works at the site-level instead of the page level. Browsershots, BrowserLab, and SuperPreview provide multiple screenshots of a single page, and leave the rest up to you. Browsera will crawl the pages on your site and actually test them for layout inconsistencies and scripting errors. Instead of spending time identifying all of your URLs and reviewing each screenshot for each page, you can simply view a consolidated Browsera report listing the specific pages and browsers that have problems.
Link: http://www.browsera.com/

