Key facts
- Major U.S. real estate portals largely present overlapping inventory and core property data.
- 74.3% of sampled properties appeared on all four major portals (Zillow, Realtor.com, Redfin, Homes.com).
- Homes.com and Redfin showed more coverage gaps, particularly for homes priced under $500,000.
- Compass "coming soon" listings were found primarily on Redfin, labeled as "Early Access."
- Days on market (DOM) display was largely consistent across portals, with minor differences noted.
- Realtor.com prominently labels contingent and pending listings, unlike other portals.
Buyers who rely on a single large real estate portal may be missing crucial information, according to a Consumer Policy Center (CPC) report released Tuesday. The analysis found that while the four dominant U.S. listing portals—Zillow (including Trulia), Realtor.com, Redfin, and Homes.com—largely present overlapping inventory and core property data, they diverge in several ways that can impact home shoppers and agents.
The report, "Home Search I: Comparing the Big Real Estate Portals," examined over 2,000 listings for 500 properties across 21 communities during August and September 2026. It found that 74.3% of sampled properties appeared on all four portals, and 83.4% were listed on at least three, reflecting continued access to local Multiple Listing Service (MLS) data.
However, coverage gaps were observed. Zillow and Realtor.com had fewer instances of missing properties compared to Redfin and Homes.com. The CPC attributed this difference partly to how portals handle lower-priced inventory; Homes.com and Redfin missed more homes priced under $500,000. This suggests that buyers favoring these sites for community searches might see a narrower selection of entry-level options.
A notable exception to the general overlap involved Compass's "coming soon" properties, with 14 identified appearing only on Redfin, where they were labeled "Early Access." These listings were concentrated in higher-priced areas and were part of Compass's phased marketing strategy.
The report also examined how portals display days on market (DOM), finding a high degree of agreement among the sites. However, minor differences were noted, particularly involving relistings or timing updates. Realtor.com was highlighted for prominently displaying contingent and pending listing statuses in community searches, a feature that requires deeper navigation on other platforms. It also includes lot acreage on the primary listing page.
Despite these differences, the CPC report reinforces the central role of these portals in consumer home discovery. National Association of Realtors data show that nearly all recent buyers used the internet, with more than half finding their purchased home online. The CPC warns that significant changes in portal access to MLS data could reduce transparency and consumer confidence.