SPACEXPLORATION vs. CoStar®
$0 Free
To list, search, and hear from buyers. For brokers, and for owners selling or leasing their own property.
Selling your own building? List it yourself, free. No broker needed.
$8,119 a month5
What the City of San Diego pays for 17 users, under a contract from December 2025.
CoStar is a paid research subscription, and the listings inside it are for subscribers. SPACEXPLORATION is a public marketplace: brokers and owners list free, anyone can search without an account, and AI assistants are welcome.
Compiled October 14, 2026
Listing a property
Who sees a free listing
- SPACEXPLORATION
Everyone
Public on the web, on the map, and to AI assistants. Nobody needs an account to see it.
Your team
- SPACEXPLORATION
Free for everyone on it
Invite your brokerage. Every member lists and searches at no cost.
- CoStar
Priced by the seat3
Contract rates depend on the number of sites and users, among other factors.
Finding property
Searching listings
- SPACEXPLORATION
Free, no account
Search, open any listing, and contact the broker or owner without signing up.
- CoStar
Subscribers only1
CoStar requires a subscription to view listings.
Building and area data
- SPACEXPLORATION
Free on every listing
Census demographics, FEMA flood and hazard risk, EPA records, and the county's public record, wherever those sources cover the property.
- CoStar
Inside the subscription3
Demographic, ownership, and tenant data are part of the paid platform.
AI assistants
Searching and managing listings
- SPACEXPLORATION
Claude, ChatGPT, Grok Bot, OpenClaw, and more
Ask your AI assistant to search listings, no account needed. Sign in through it, and it can create, update, and publish your listings too.
- CoStar
Kept out4
Its terms bar subscribers from putting CoStar data into outside AI tools.
AI discovery
- SPACEXPLORATION
Open to AI
AI assistants are welcome to read every public listing, so a property can show up in their answers.
- CoStar
Bots not allowed4
Its terms forbid bots and automated tools from copying the site.
Contract
Leaving
- SPACEXPLORATION
Any time
Nothing to cancel. Withdraw a listing or delete your account whenever you like.
- CoStar
Auto-renewing contracts3
Subscriptions typically renew automatically, most for a term of at least a year.
What you pay
- SPACEXPLORATION
$0 Free
To list, search, and hear from buyers. For brokers, and for owners selling or leasing their own property.
- CoStar
$8,119 a month5
What the City of San Diego pays for 17 users, under a contract from December 2025.
Built in, free with an account
An AI assistant that lists it for you.
Hand it a flyer and it drafts your listing, changes it when you ask, and publishes when you confirm.
- Drop in photos or documents, and it adds them to the listing.
- Ask about any property: flood risk, nearby hazards, and the area.
Join free, and bring your AI assistant.
For people
Brokers, owners selling or leasing their own property, buyers, and tenants. An account lets you list property, save searches, and get an email when a new listing matches.
For your AI assistant
Connect Claude, ChatGPT, Grok Bot, OpenClaw, or another AI assistant. Ask it to find property in plain English, no account needed, or sign in through it to create and manage your listings.
Adding it by hand? Paste this connector address:
https://spacexploration.com/mcp