Zillow vs Realtor.com: Which Has the Data You Need?
Zillow and Realtor.com are the two largest US real estate portals — Zillow leads on traffic and its Zestimate valuations, while Realtor.com is sourced directly from the MLS for more authoritative listing accuracy. For most data use cases you want both, and PropAPIS extracts each through one unified API.
At a glance
| Zillow | Realtor.com | |
|---|---|---|
| Owner | Zillow Group | News Corp (Move, Inc.) |
| Monthly visits | ~350M | ~150M |
| Listing source | Aggregated + direct | MLS (near-real-time) |
| Valuations | Zestimate + Rent Zestimate | RealEstimate (multiple AVMs) |
| Strength | Reach, off-market valuations, history | MLS accuracy, fresh status changes |
| Public API | Partial / limited | No public listings API |
When to use which
- Choose Zillow data for the widest reach, off-market valuations (Zestimate covers ~100M+ homes beyond active listings), and long price/tax history.
- Choose Realtor.com data when listing accuracy and timeliness matter most — it pulls directly from the MLS, so status changes (pending, sold) surface fast.
- Use both for cross-validation: compare a Zestimate against Realtor.com’s RealEstimate and the MLS list price to gauge confidence.
Access both through one API
PropAPIS normalizes Zillow and Realtor.com into a single schema, so you query both the same way and merge results without maintaining two scrapers.
See the Zillow and Realtor.com platform pages for the full data fields and code examples.