In-Depth Review: TestFit
What It Is
A feasibility platform that generates site plans from a parcel and a set of zoning and financial inputs, then reports yield, unit mix, parking counts, earthwork, and return while you change the assumptions. It covers multifamily, single-family, industrial, retail, hotel, data center, and parking.
Who It's For
Developers testing whether a site pencils, and the architects and planners who answer that question for them. Also municipal planners, who use it to show options in public meetings.
Why It Matters
Feasibility is a question asked under time pressure, usually in a meeting, and the cost of answering slowly is losing the deal. TestFit changes the unit mix, the parking ratio, or the setback and recalculates the plan and the pro forma together, so the answer arrives while the question is still live. The vendor's customers report the shift in those terms: a Pennsylvania township planner says an option that took a day in SketchUp now takes 15 minutes, in front of elected officials.
Problem Solved
Sizing a site by hand means drawing units, counting stalls, checking the result against setbacks and FAR, then redoing all of it when the land cost or the unit mix changes. TestFit runs that loop from the parcel, which you enter by parcel number, by metes and bounds, or by drawing it. You set the zoning parameters and the cost and revenue assumptions, and it returns building placement, unit configurations, parking layout with ratios, vertical circulation, cut and fill volumes, and a takeoff of square footage and unit counts. The Pro Forma module keeps the financial model attached to the plan, so a layout change moves the return rather than requiring a separate spreadsheet pass.
Audience Fit
Primary Users:
- Developer
- Architect
- Urban Planner
- Land Planner
Ideal Fit:
- Multifamily, industrial, and parking-heavy projects where yield and stall count drive the deal
- Deal screening where many sites get evaluated and most are rejected
- Public meetings and entitlement work that need options shown live
- US projects, since the zoning and code framing is built around US practice
Key Differentiator
Site plan and pro forma move together, across eight building types
Workflow Fit
Project Phases Covered:
- Feasibility
- Concept
Where It Plugs In:
Sits at the front of a project, before anything is modeled properly. Output leaves as DXF for AutoCAD, SKP for SketchUp, a file the Revit add-in imports, plus glTF, CSV, and PDF. The design team rebuilds from that starting point rather than continuing in it.
User Experience
Speed: Parking layouts generate in seconds, per the vendor, and the whole point of the tool is recalculating an option during a conversation
Interface: Five modules: Site Solver for generative site planning, Parking Solver, Site Intelligence for zoning and environmental data, Pro Forma, and an MCP connection that lets an AI assistant prompt the tool
Learning Curve: Moderate. Reviewers on G2 and Capterra report the automated path is quick to learn and the manual override mode is harder, including entering exact dimensions on a footprint
Collaboration: Parking Solver includes unlimited users; the annual tiers are quoted per firm with enterprise single sign-on on the top tier
Integrations: Revit add-in, AutoCAD via layered DXF, SketchUp via SKP, Zoneomics for zoning data, Esri for flood zones and wetlands, SSURGO for soils, Thornton Tomasetti's TT Core Studio for parking structure, and Rayon for presentation. No Rhino, Grasshopper, or Forma integration, and no public API.
Bonus Insight
Know what grade of output you are buying. Independent reviewers consistently describe the result as feasibility-grade, with unit plans that show room proportions and approximate dimensions while kitchens, bathrooms, and closets appear as zones rather than designed rooms. That is the correct depth for a go or no-go decision and the wrong depth for design development, so budget for the design team rebuilding the scheme in Revit or Rhino afterward. Reviewers also report it struggles on small urban sites with irregular lot shapes, and it is the wrong tool for institutional, civic, or one-off custom buildings. The zoning and code framing is built around US practice; the company publishes no statement about non-US coverage or metric support, so ask if you work outside the United States. Every speed figure on the site, including four times faster and the 15-minute township claim, is self-reported by TestFit or its customers, and no independent benchmark exists. On the company itself, the facts are solid: founded by Clifton Harness and Ryan Griege around 2016 with public release in October 2017, based in Dallas, and funded with $22 million across a $2 million seed in 2020 and a $20 million Series A in 2022, both led by Parkway Venture Capital. The closest alternatives are Autodesk Forma, which is stronger on solar, wind, and daylight analysis, and Giraffe, which is built around the same live financial feedback. Be careful with online comparison articles here, since the most detailed ones are published by competitors.
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