BuiltStackTestFit vs Deepblocks (2026)
Pricing, integrations, and who each is built for, from each vendor's own site. Updated 2026-10-19.
Both help a developer decide whether a site works, but they start in different places. TestFit starts from the site and generates editable building and parking layouts. Deepblocks starts from the parcel's zoning and puts 3D massing next to a returns model.
Key differences
- Starting point: TestFit starts from a site layout. Deepblocks starts from the parcel's zoning in cities it has built.
- Pricing: TestFit's Parking Solver is $195/month and Site Solver starts at $15,000/year. Deepblocks DEV starts at $99.99/month with metered usage.
- Maturity: several Deepblocks products, including site selection agents, are listed as coming soon.
Which to shortlist
- Look at TestFit if you need layouts, parking and yield you can iterate on, especially for multifamily, industrial or hotel.
- Look at Deepblocks if you're screening parcels on zoning first and want a quick returns model on a monthly budget, in cities Deepblocks covers.
Side by side
| TestFit | Deepblocks | |
|---|---|---|
| What it does | Generates building and parking layouts for a site in seconds so you can test unit count and yield before paying for design. | Finds developable parcels in U.S. cities and runs zoning-based massing and quick return models on them. |
| Company | TestFit | Deepblocks |
| Listed pricing | Parking Solver $195/mo; Site Solver from $15,000/yr; Site Solver Portfolio from $20,000/yr source | Feasibility Studies from $99.99/mo source |
| Integrations (as stated) | None stated | None stated |
| Built for (per vendor) | Developers, architects, contractors and civil engineers testing site layouts and yield | Zoning-first parcel screening with 3D massing and a quick returns model |
| Peer rating | Opens as ratings come in | Opens as ratings come in |
Sources: each vendor's own website, checked 2026-10-19. Pricing is as publicly listed and can change. Figures like customer counts or accuracy rates are the vendor's own claims, not ours. Peer data (who uses it, what they pay, hours saved) opens as ratings come in.
TestFit, from its own site
- Describes itself as a real estate feasibility platform that starts from an AI-generated site plan you can edit "down to the last parking stall." source
- Lists building types including multifamily, single family, industrial, retail, hotel, parking and data center. source
- Parking Solver is $195/month billed monthly with unlimited users; a live pro forma add-on is +$170/month. Site Solver starts at $15,000/year and adds generative design and an MCP connection. source
Deepblocks, from its own site
- Its live product, DEV, combines parcel zoning, 3D massing and a financial model, from $99.99/month. source
- Says each zoning value includes a citation to the city's ordinance or maps, and that zoning shows as unavailable until a city has been built. source
- Usage is metered: plans include an allowance, with extra usage billed on demand. Exports are a branded PDF, a CSV of assumptions, or a share link. source
- Site Selection (AI agents) is listed as "Coming October 2026"; several other products are listed as "Coming Soon." source
FAQs
What's the difference between TestFit and Deepblocks?
Both help a developer decide whether a site works, but they start in different places. TestFit starts from the site and generates editable building and parking layouts. Deepblocks starts from the parcel's zoning and puts 3D massing next to a returns model.
Is TestFit or Deepblocks cheaper?
TestFit: Parking Solver $195/mo; Site Solver from $15,000/yr; Site Solver Portfolio from $20,000/yr. Deepblocks: Feasibility Studies from $99.99/mo. Both as listed on the vendors' own sites; compare on your own volume, since list prices and quotes can differ.
Which do real estate developers prefer, TestFit or Deepblocks?
We don't know yet, and we won't guess. BuiltStack's peer data (who uses each tool, what they pay, hours saved) opens as ratings come in from practitioners.
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