CoStar vs Zillow
Which brand does AI recommend more? Head-to-head comparison across all engines.
Wondering whether to choose CoStar or Zillow? We compared how ChatGPT, Gemini, Claude, and DeepSeek mention each brand. Zillow leads with an AI score of 87 vs 24 for CoStar. See the full breakdown below.
24
CoStar
costar.com
vs
87
Zillow
zillow.com
| Engine | CoStar | Zillow | Winner |
|---|---|---|---|
| ChatGPT | 0% | 100% | Zillow |
| Claude | 0% | 100% | Zillow |
| DeepSeek | 0% | 100% | Zillow |
| Gemini | 100% | 100% | Tie |
| Mistral | 100% | 100% | Tie |
CoStar
✅ Decent support · Good feature set · Reliable performance
⚠️ Pricing can be high · Limited free tier
Zillow
✅ Most-visited real estate website in the US with 200+ million monthly visits · Zestimate provides instant home value estimates · Comprehensive listings with 3D tours and floor plans
⚠️ Zestimate accuracy varies significantly by market · Agent advertising model creates conflicts of interest · Zillow Offers (iBuying) was shut down after $881M loss