SeeWhy, a company that tells web sites why people leave behind empty shopping carts, half-filled registration forms, etc., has launched a free service that tracks web site abandonment and promises to retain 30 percent of site visitors who may have otherwise left.

Competing with analytics companies like Omniture, Coremetrics and WebTrends, this new service — called Abandonment Tracker Free — allows web sites to follow up with page viewers who jumped ship in the form of personal emails or promotions. To do this, it records any contact information or shopping cart items supplied or selected by users before they left.

Based in Andover, Mass., SeeWhy also just raised $4.5 million from Scottish Equity Partners, Logispring and Pentech Ventures. It counts Amazon, eBay, Citibank and Mastercard among its users.

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