Homebuyers and agents collaborate together in one central hub to find their dream home. In real estate, CoStar stands out as being an incredible well-funded company (worth $34 billion) with a strong market-leader track record. Even by U.S. portal standards, however, CoStar boasts lofty ambitions: CEO Andy Florance appeared at Property Portal Watch earlier this month to announce its plan to “overthrow” Zillow and Rightmove with an enormous $9 billion war chest.

Listing data provided by RealEstate.com is organized by state, type of housing (such as condo or apartment) and then further segmented into categories like areas, to help customers easily filter listings. There may be some information gaps which need filling, such as whether the neighborhood is walkable, conducive to public transit and/or has a good school district.

And the company lacks an ability to list properties within multiple listing services (MLS), making it harder for agents who work exclusively with homebuilders to add homes they have exclusives for to the website. Other U.S. portals have this feature.