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Marengo vs TestFit

Two ways to speed up data center site feasibility. Marengo is an engineering firm that uses in-house AI tools to deliver due diligence, feasibility, concept and FEED / permitting design for data center sites. TestFit is real estate feasibility software, with a Data Center typology, that teams run themselves to generate site plans, massing and a pro forma. Desk research from vendor pages and Marengo's YC profile read Oct 19, 2026; not tested, no winner.

DESK RESEARCH, NOT TESTED. Compiled from vendors' public websites (accessed Oct 19, 2026). Vendor claims are not verified by Means & Methods Lab. No scores or rankings.

In short: Marengo (AI-assisted data center engineering firm; no public prices (quote / sales)) vs TestFit (Site feasibility & generative design; vendor publishes prices). Facts last checked Oct 19, 2026. No winner declared; not tested.

Side by side

Marengo vs TestFit: vendor-published facts side by side
Sheet rowMarengoTestFit
CategoryAI-assisted data center engineering firmSite feasibility & generative design
AI role (our label)AI-firstAI features added to established product
What it doesAn engineering firm rather than a software product: it uses in-house AI tools to speed up data center pre-construction engineering, from site due diligence through feasibility, concept design and FEED / permitting design. The site (read Oct 18, 2026) lists deliverables including a site constraints register, developable-area analysis, utility and infrastructure assessment, test fit, master plan, CAD layouts, electrical architecture and single-line diagrams, cooling, civil and structural concepts, a 3D coordinated model and permit-design documentation. It says designs are reviewed and validated by licensed engineers before delivery, client IP is never used to train models, and the client owns everything Marengo produces. Vendor claims, not verified: design cycles of 5-6 months instead of 10-12, 1,000+ concepts explored in parallel, and feasibility studies in half the time and at half the cost. Y Combinator batch: Summer 2026 (YC company profile). Re-checked Oct 19, 2026: the site (rendered in a headless browser) also lists a site risk assessment, a decision-ready feasibility report, basis of design and design criteria among deliverables, an engagement that starts with one site, measured against your conventional workflow, before scaling to more sites, a 6-8 week feasibility timeline versus 12-16 weeks traditional (vendor claim), and Y Combinator, a16z Scout Fund and Index Ventures Scout Fund as backers.Real estate feasibility platform built on what the vendor calls an editable AI-generated site plan, with massing, a pro forma and takeoffs. Features listed: parcel mapping, road layout, turning radii, topography, parking automation, 2D/3D massing, a pro forma synced to the layout, and automatic takeoffs for parking, infrastructure, and earthwork (including cut and fill). Generative design and an MCP connection are on Site Solver. Exports to Revit, AutoCAD, SketchUp, Excel, and PDF. Vendor cites 6,200+ users (vendor claim). Re-read Oct 17, 2026: homepage unchanged in substance. The product menu lists Site Solver and Parking Solver, with Site Intelligence (site, environmental and zoning data), Pro Forma and an MCP Connection ("prompt your site plans with an AI assistant") as add-ons, and features a TestFit 5.26 release. The pricing FAQ says generative design is only on Site Solver, Revit and SketchUp integration is on all plans, and some data layers (such as parcel, flood zone, wetland or zoning data) may not be available in all countries. Re-checked Oct 19, 2026: the Data Center typology page describes generative design bounded by a minimum and maximum megawatt limit, custom parameters such as target power density, design PUE and front and back yard depths, regional power plant data, multi-level infill data centers with data halls, electrical rooms and mechanical yards, and phased campus layouts with major roads and substation layouts; the pricing table lists Data Center among building typologies.
Who it's forData center developers and owners evaluating sites and campuses.Developers, architects, contractors, and civil engineers on the deal team.
Pricing (as publicly stated)No public prices (checked Oct 18, 2026; unchanged Oct 19, 2026): Marengo sells engineering services; the call to action is "Give Us a Site" and marengox.com/pricing returns a not-found page. Confirm with Marengo.Parking Solver $195/month billed monthly (unlimited users), with optional add-ons: Site Intelligence +$150/mo (zoning and environmental data, 3D terrain with cut and fill analysis, power and utilities infrastructure), Pro Forma +$170/mo and MCP Connection +$100/mo. Site Solver from $15,000/year billed annually (includes Parking Solver plus generative design, MCP Connection, Site Intelligence, custom unit types, high-detail building presets and a dedicated onboarding and account manager; Pro Forma optional). Site Solver Portfolio from $20,000/year (adds volume pricing, enterprise SSO and quarterly business reviews). (Re-checked Oct 17, 2026; unchanged Oct 19, 2026. Earlier check Oct 14, 2026: same plan prices; the Pro Forma add-on was the only add-on price we recorded.)
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Vendor links
Sources

Facts last checked: Oct 19, 2026. Prices change; check the vendor page before relying on them.

Where the vendor descriptions differ

  • What you get: Marengo sells engineering deliverables: a site constraints register, developable-area analysis, utility and infrastructure assessment, site risk assessment, test fit, master plan, CAD layouts, electrical architecture and single-line diagrams, cooling, civil and structural concepts, a 3D coordinated model, a feasibility report and permit-design documentation. It says designs are reviewed and validated by licensed engineers, client IP is never used to train models, and the client owns what it produces. TestFit is a software subscription: parcel mapping, road layout, topography, 2D/3D massing, a pro forma synced to the layout and automatic takeoffs, with exports to Revit, AutoCAD, SketchUp and Excel.
  • Data center scope: TestFit's Data Center page describes generative design bounded by a minimum and maximum megawatt limit, custom parameters such as target power density, design PUE and yard depths, regional power plant data, multi-level infill data centers (data halls, electrical rooms, mechanical yards) and phased campus layouts with major roads and substation layouts. Marengo's site example is a 500 MW campus concept that works through power (HV incomer, 33 kV transformer line), direct-to-chip liquid cooling, utilities, access, the civil platform, structure and permitting setbacks on a real parcel.
  • AI role: Marengo describes in-house AI tools used by its own engineers, with multi-objective optimization and 1,000+ concepts explored in parallel (vendor claim). TestFit calls its site plan editable and AI-generated; generative design is on Site Solver only, and an MCP Connection add-on lets you prompt site plans from an AI assistant.
  • Claims to read carefully: Marengo's 5-6 month design cycles instead of 10-12, and feasibility in 6-8 weeks instead of 12-16 at half the cost, are vendor claims. TestFit's 6,200+ users and 5x faster site planning are vendor claims. None are verified here. Marengo is a Y Combinator Summer 2026 company.
  • Pricing (checked Oct 19, 2026): TestFit publishes Parking Solver at $195/month, Site Solver from $15,000/year (includes generative design) and Site Solver Portfolio from $20,000/year, plus add-ons (Site Intelligence +$150/mo, Pro Forma +$170/mo, MCP Connection +$100/mo); its pricing table lists Data Center among building typologies, so confirm which plan includes it. Marengo publishes no prices; it is engaged per site ("Give Us a Site") and marengox.com/pricing returns not-found. Neither tool has been tested by Means & Methods Lab.

Paraphrased from the sources listed above. Vendor claims are reported as claims.

What users say

The facts above come from vendor websites. Whether either tool is any good for your work is something only people who use them can say. These are member reviews, all ratings shown, never edited or removed for being negative.

Used either of these? Share your take

Good or bad, an honest review from an estimator, PM or super helps the next team more than another vendor demo. You post under a handle; your email is never shown.

Questions to ask in your review

  • Which TestFit plan includes the Data Center typology, and whether its power inputs match your utility's interconnection data
  • What a Marengo feasibility or concept engagement costs for one site, and which engineering disciplines sign the deliverables
  • How each handles your own design standards and PUE targets
  • What did you use it for, on what kind of work and project size?
  • How long did setup and training take, and who on your team did it?
  • What does it cost you in practice, compared with what the sales call said?

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