Zillow vs Realtor.com vs Redfin, What Really Sets Them Apart

If you have ever looked at the same house on three different websites and seen three slightly different stories, you are not imagining things. Zillow, Realtor.com and Redfin all show homes for sale, but they are built on different business models, pull their data in different ways and make their money from different people. Knowing those differences helps you decide which site to trust for what, and why the "contact agent" button on each one may not connect you to the person you expect.

This guide compares the three biggest home-search portals in plain terms. It does not rank them by accuracy, because no portal publishes a perfectly comparable measure and the answer changes by market. Instead, it explains how each one works so you can use them with clear eyes.

The short version

All three sites are useful, and many buyers keep all three apps on their phone. The key differences come down to three questions. Where does the listing data come from, who answers when you ask about a home, and how does the site estimate value?

Where the listings come from

Almost every for-sale listing marketed by an agent in the United States starts in a multiple listing service, or MLS. An MLS is a private database run by local REALTOR associations or regional data companies. Listing agents enter the property, photos, price, showing instructions and status. From there, data travels to websites in a few ways.

Broker feeds and syndication

Listing brokerages can choose to send, or syndicate, their listings to outside portals. Some MLSs pass listings along on behalf of their members. This is how much of what you see on Zillow and Realtor.com arrives. Because each feed has its own schedule and rules, a price change or a pending status may show up on one site before another.

IDX and brokerage data

Redfin is a licensed brokerage that participates in many MLSs, which lets it display listings under the same data-sharing rules, often called IDX or VOW rules, that local brokerage websites use. That is one reason Redfin pages often look similar to what a local agent's website shows. The tradeoff is that Redfin's coverage depends on the markets where it operates as a brokerage or has data access.

Why the same house looks different

• Timing. Feeds refresh at different intervals, so status changes can lag.
• Field mapping. Each portal translates MLS fields into its own layout, and some details, such as HOA notes or lot dimensions, may not carry over.
• Opt-outs. Some brokerages limit where their listings go, and some sellers ask for limited marketing.
• Extra inventory. Zillow in particular shows for-sale-by-owner homes and other non-MLS listings that will not appear in an MLS-based search.

When a status matters, such as whether a home is still active, the listing agent or your own agent checking the MLS directly is the most reliable source.

Who you are really contacting

This is the part most buyers miss. Portals earn a large share of their revenue from real estate professionals, so the contact forms are part of an advertising business.

Zillow

Zillow's Premier Agent program lets agents pay to receive inquiries from buyers in certain areas. In many markets the arrangement is a referral-fee model, where the agent pays Zillow a share of the commission after closing rather than an upfront advertising fee. When you tap a button to tour or ask a question, you may be connected to one of these partner agents rather than the agent who listed the home. Zillow generally shows the listing agent separately on the page.

Realtor.com

Realtor.com also sells leads to agents through paid programs, including some that work on a referral-fee basis. Its pages usually show the listing brokerage, and many listings include the listing agent's name. If you specifically want the listing agent, use that contact information rather than a generic request form.

Redfin

Because Redfin is a brokerage, most tour requests go to a Redfin agent or, in areas it does not fully staff, a partner agent from another brokerage. Redfin has also offered listing services to sellers at advertised fees that are often below what many traditional brokerages charge, though the terms, minimums and availability vary by market and change over time. In 2025, Redfin became part of Rocket Companies, which also owns a major mortgage lender, so expect mortgage offers to appear alongside your searches.

Tip. Submitting a form on any portal is not the same as hiring an agent. You are not obligated to work with whoever calls you back. Since the 2024 NAR settlement changes, agents who belong to an MLS generally need a written agreement with a buyer before touring homes, so read any agreement before you sign it.

Home value estimates and how to read them

People often search questions like "how accurate are Realtor.com estimates" or "is Realtor or Zillow more accurate." The honest answer is that every automated valuation model, or AVM, is a statistical estimate based on public records, recent sales, listing data and the home's known features. None of them has walked through the house.

• Zestimate. Zillow's estimate is the most widely seen. Zillow publishes its own error ranges by market, and they are typically tighter for homes currently on the market than for homes that are not.
• Realtor.com estimates. Realtor.com typically shows several third-party estimates for one property, which is useful because it shows how much the models disagree.
• Redfin Estimate. Redfin's model draws on the MLS data it receives as a brokerage, and Redfin also publishes accuracy information for its own model.

Estimates tend to struggle with unusual homes, rural properties, recent renovations, homes with few nearby sales and fast-moving markets. If the estimates for one property spread widely, treat that as a sign the value is uncertain, not as proof that one site is right.

For a real pricing decision, ask a local agent for a comparative market analysis (CMA) or hire a licensed appraiser. A CMA uses hand-picked comparable sales and accounts for condition and upgrades, which an AVM cannot see.

Which site to use for what

Rather than picking one winner, match the tool to the job.

Other portals exist too. Homes.com, owned by CoStar, has grown in recent years and markets itself on connecting buyers with listing agents. Local brokerage sites with IDX search can also be excellent, sometimes updating faster than national portals. If you are wondering what site realtors use themselves, the answer is usually their local MLS system, with the national portals serving as marketing channels.

Selling a home with Redfin vs a traditional realtor

Sellers often compare selling with Redfin vs a realtor at a traditional brokerage. This is really a comparison of brokerage models. Redfin agents have typically been employees paid a salary plus bonuses, and the company has advertised lower listing fees in many markets. A traditional independent agent usually works on commission and may offer more flexibility in service, marketing or fees. Neither model is automatically better, so compare actual proposals.

When you interview any listing agent, including a Redfin agent, ask the same questions.

1. What is the total fee, and will I be asked to offer anything to a buyer's agent?
2. Who will be my day-to-day contact, and who handles showings?
3. Where will my listing appear, and when?
4. What is included in marketing, such as photography, floor plans and open houses?
5. How many homes like mine have you or your team sold nearby recently?
6. What are the cancellation terms if I am not satisfied?

Commissions have always been negotiable. Since the NAR settlement practice changes took effect in August 2024, offers of buyer-agent compensation are no longer shown on MLS listings, so ask any agent to explain how compensation is being handled in your local market today.

A portal-savvy buyer checklist

Use this checklist to get the benefit of all three sites without getting tangled in their lead systems.

• Set up the same saved search on at least two portals and compare what shows up.
• Note the listing brokerage name on every home you like.
• Before tapping "request a tour," decide whether you want the listing agent, your own agent or a portal partner agent.
• Treat every automated estimate as a rough range, not a price.
• Confirm active or pending status with an agent before getting attached to a home.
• Read any buyer agreement fully, including compensation, length and how to end it.
• Be cautious with rental listings that ask for money before a tour, since scammers copy real photos.
• Get pre-approved by a lender you choose, not only one suggested by a portal.

The bottom line

Zillow, Realtor.com and Redfin are search tools layered on top of the same underlying MLS system, each with its own way of making money. Zillow is a giant marketplace with the broadest audience and extras like FSBO homes and rentals. Realtor.com leans on MLS relationships and shows multiple valuation opinions. Redfin is a brokerage first, so its search is tied to its own agents and services. Use all of them to learn a market, then rely on a licensed local professional and verified MLS data when real money is on the line.

This guide is general information, not legal, tax or financial advice. Rules differ by state; confirm details with a licensed professional or your state real estate commission.