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