The 7 best CoStar alternatives for brokers in 2026

In this article

Short answer: West Kite is the best CoStar alternative for most independent brokers. At $149 a month, it finds the owner behind any LLC, gets you their phone number and lets you contact them from one place. If you need comps instead, Crexi Intelligence ($299 a month) is the best paid option and CompStak is the best free one for lease comps.

Yes, we make West Kite, and we put it first because we think it's the right pick for most brokers. We've also said who should choose something else.

CoStar alternatives compared

CoStar doesn't publish its prices. See how much CoStar costs for the estimates we could find.

What you give up when you leave CoStar

CoStar's product page lists property records, owners, tenants, listings, sales comps, lease activity and market analytics. No tool here covers all of that.

So before you switch, write down the last five things you used CoStar for. If most of them were "who owns this building?", you can probably replace it. If you pull lease comps and market reports every week, you probably can't, and a cheaper tool would sit next to CoStar rather than replace it.

Ask West Kite who owns a building and get their phone number in one search.Try it free ↗

1. West Kite

Our pick for most brokers. It's built for what you probably use CoStar for most: finding owners and getting them on the phone.

You ask questions in plain English, like "warehouses in Los Angeles owned by the same family since before 1980". It searches 107 million US parcels, traces LLCs back to the people behind them, shows the source for each step, and finds emails and phone numbers. Prospects go into a built-in pipeline, and you can send email or mail from the same place.

• Price: $149 a month, with unlimited search and ownership research.
• Included: about 150 phone numbers or 300 emails a month. After that, it's $1 per number and 50 cents per email, and nothing if it finds nothing new.
• Trial: 7 days free, no card, no sales call.
• Works in: the web app, Claude and ChatGPT.
• Coverage: 107 million parcels across 1,787 counties in 27 states and Washington, DC.
• Not for: lease comps or market forecasts.

See the full West Kite vs CoStar comparison.

2. Crexi Intelligence

Crexi Intelligence is best if you mostly need comps and property records and want a published price.

It includes nationwide property records, exportable sales and lease comps, owner contact details and market reports. It also comes from Crexi, the listings marketplace many brokers already use.

• Price: $299/month, cancel anytime. Annual pricing goes through sales.
• Limits: owner contact views and exports use monthly credits.
• Good for: brokers whose main need is comps.
• Check first: try a few comps you already know and see whether they match the deal you remember.

See West Kite vs Crexi Intelligence.

3. Reonomy

Reonomy is best for building big owner lists and seeing everything one owner holds.

It lists 53M+ commercial properties, 68M+ transactions and 200+ search filters, plus tools for tracing the owner behind an LLC. It's part of Altus Group.

• Price: from $400/month on an annual plan. The annual plan saves 30%, and the monthly price isn't published.
• Limits: 1,000 exports a month. They're included on the annual plan and an add-on on monthly.
• Good for: teams pulling large lists into their own CRM or mail tool.
• Check first: confirm the monthly price and export cost before you commit.

See West Kite vs Reonomy.

4. CompStak

CompStak is the best free option for lease comps, as long as you have comps to trade.

Brokers and appraisers join CompStak Exchange for free. You submit comps to earn credits, then spend the credits to unlock other people's. You can't buy credits, so it only works if you contribute.

• Price: free for brokers and appraisers.
• Good for: leasing brokers with a steady flow of deals.
• Not for: owner research or anyone with no comps to share.

5. PropertyShark

PropertyShark is best for pulling detailed reports on individual properties. It has been part of Yardi since 2010.

• Price: review sites like G2 list plans from about $50 to $170 a month. Confirm on PropertyShark's own site.
• Limits: monthly report quotas that don't roll over.
• Good for: looking up one building at a time.
• Check first: how much detail it has in your county.

6. PropStream

PropStream is the cheapest way here to build lists and skip trace them, but its pricing page doesn't mention commercial property. Test it on your own property type before you rely on it.

• Price: $99/month, $199/month or $699/month. There's a 7-day trial with 50 free leads.
• Contact costs: 10 to 12 cents a contact, depending on the plan.
• Good for: cheap list building and skip tracing.
• Not for: comps on larger commercial deals.

7. Public records

If you only look up a few buildings a month, you may not need software at all. The assessor gives you the owner of record, the recorder gives you the deed, and your state's business registry gives you the LLC filing.

It's free but slow. These guides walk through it:

• Find the owner of a commercial property held by an LLC
• Find sales comps for free
• Find the tenants in a building

How to choose in an afternoon

Pick ten buildings you already know, including a few hard ones: an LLC owner, several parcels, a recent sale. Run the same ten through each tool on your shortlist and note three things:

1. Did it find the right building and owner?
2. Did it get you someone you could actually call?
3. How long did it take, and what did it cost beyond the subscription?

We think West Kite will win that test for most prospecting brokers. Try it free and see.

Frequently asked questions

Is there a free alternative to CoStar?

CompStak is free for brokers and appraisers if you contribute lease comps. Public records are free for owner and sale information. Neither replaces the whole of CoStar.

Is LoopNet a CoStar alternative?

Not really. CoStar Group owns LoopNet, and LoopNet is a listings marketplace rather than a research database.

What's the cheapest CoStar alternative with owner data?

Among tools with public prices, PropertyShark and PropStream start lowest, though PropStream doesn't advertise commercial coverage. West Kite is the cheapest we found that combines unlimited ownership research, owner contacts and outreach, at $149 a month.

Can anything fully replace CoStar?

Not for everyone. If you rely on its lease activity and market analytics every week, nothing here matches all of it. Plenty of brokers don't need all of it, which is where these tools come in.