Zillow vs. CoStar Group
Side-by-side across both vendors’ full G2 portfolios — reviews, ratings and category coverage aggregated to the company, not a single product.
| Metric | Zillow | CoStar Group |
|---|---|---|
| Avg. rating | 3.9 | 3.7 |
| Total reviews | 611 | 193 |
| Review growth (QoQ) | -60.0% | — |
| Products on G2 | 4 | 6 |
| Categories covered | 5 | 6 |
| Best category rank | #1 in Multiple Listing Service (MLS) | #5 in Multiple Listing Service (MLS) |
| Small Business | 59.2% | 47.3% |
| Mid-Market | 26.4% | 32.4% |
| Enterprise | 14.4% | 20.2% |