Zillow (Z), an online real estate site for homebuyers, bought an online and mobile collaborative shopping platform that allows homebuyers to search, track, organize and discuss for-sale listings with their real estate agent or other users.

The service, Buyfolio, is Zillow’s fourth acquisition. Financial terms of the deal were not disclosed.

New York City-based Buyfolio provides homebuyers with real-time snapshots of their home search and keep them up-to-date on any new listings that may be available.

Real estate agents and brokers should benefit from the acquisition, Zillow said. Zillow plans to provide Zillow Premier Agents with Buyfolio’s online and mobile products to assist them in growing their business, online presence and consultant capabilities. Premier Agent is a marketing tool that agents subscribe to on the Zillow site that provides various levels of branding and marketing to agents based on subscription levels.

“This acquisition allows Zillow to expand its suite of software tools for Premier Agents and brokerages, and will help them convert Internet leads into closed sales,” said Spencer Rascoff, Zillow CEO. “We’re very excited to welcome the Buyfolio team into Zillow.”

Launched in 2011, Buyfolio was started by Matt and Susan Daimler, who also founded SeatGuru.com. The platform has mobile apps for both Android and iOS. The company will continue to operate under the same name.

“Zillow shares our vision and excitement, and business will carry on as usual for Buyfolio. With Zillow's resources and support, we'll be able grow and innovate more quickly,” said Susan Daimler, Buyfolio co-founder.