Category · Design & diagrams
CAD, simulation and fabrication APIs for AI agents
Services where an agent makes and edits mechanical geometry, runs an engineering simulation, drives a 3D printer or orders a machined or printed part. Different from 3D worlds, which make scenes to look at. Compared on what geometry an agent can create and change, export formats, simulation access, how a print or an order is placed and what a licence costs.
Best CAD, simulation and fabrication APIs for AI agents, the shortlist15 head-to-head comparisons
Capability keys cad.generate · cad.edit · cad.export · cad.simulate · cad.print · cad.manufacture · All tools
letme.dev/cad.generate picks the top-graded tool in this list and says how to call it direct (how letme works).
The same listing from the live API. Graded results come first, then the official MCP registry when no graded-only filter is set.
https://www.anchorterminal.com/api/v1/searchFilters
| Compare | # | Tool | Category | Grade | Score | Agent rating | p95 | Context | Price / x402 | Auth | Where | Details |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 630 | AdamAdam AI Labs, Inc. · MCP server | CAD | C | 59.4 | none | n/a | n/a | Freemium | OAuth or key | Hosted | ||
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Adam is Adam AI Labs' AI copilot for mechanical CAD. It creates and edits parts in Onshape, Fusion, SOLIDWORKS and other desktop CAD through a hosted agent that AI clients reach over a remote MCP server and a REST API. Top strength OAuth 2.1 with PKCE, automatic client registration and 11 scopes approved per area, with Top weakness The MCP server and REST API are labelled beta, with breaking changes allowed |
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| 669 | ZooZoo Corporation · HTTP API | CAD | C | 58.7 | none | n/a | n/a | $0.0083 / credit | OAuth or key | Local | ||
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Zoo is a hosted CAD platform from Zoo Corporation with a REST API, the Zookeeper design agent over a websocket, file conversion and analysis endpoints, a CLI and a local MCP server, all built on its KCL modelling language. Top strength OpenAPI 3.0.3 served at api.zoo.dev with 226 described operations, and SDKs in Python, TypeScript, Rust and Go generated from it Top weakness No rate limits, 429 handling or idempotency keys documented for the REST API or the websocket |
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| 820 | OnshapePTC · HTTP API | CAD | C | 55.7 | none | n/a | n/a | $125 / seat-mo | OAuth or key | Hosted | ||
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Onshape is PTC's cloud CAD platform. Its REST API reads and changes documents, Part Studios, assemblies and drawings with API keys or OAuth 2.0, and the FeatureScript MCP Server in Onshape Labs lets an assistant write FeatureScript into a document. Top strength API keys scoped to permissions and revocable, and OAuth 2.0 with 60-minute access tokens and refresh tokens tied to the user's grant Top weakness Every API key request must be signed with HMAC-SHA256 over the method, nonce, date, content type, path and query, and 307 redirects need a fresh signature |
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| 1036 | PrusaLinkPrusa Research a.s. · HTTP API | CAD | D | 49.4 | none | n/a | n/a | Free | OAuth or key | Local | ||
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PrusaLink is Prusa Research's local web interface and HTTP API for Original Prusa 3D printers, built into current models or run on a Raspberry Pi. It reports status, uploads files and starts, pauses and stops prints over the local network. Top strength OpenAPI 3.0.1 spec with enums for printer and job states and documented 401, 404 and 409 responses on most operations Top weakness One credential per printer, a digest password or an API key, with no scopes, read-only mode or confirmation before a stop or delete |
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| 1154 | Autodesk Platform ServicesAutodesk · HTTP API | CAD | E | 44.3 | none | n/a | n/a | Pay per use | OAuth | Local | ||
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Autodesk Platform Services (APS, formerly Forge) is Autodesk's cloud API set. Its Automation API runs AutoCAD, Inventor, Revit, 3ds Max and Fusion headlessly on design files, beside Model Derivative, Data Management, OSS and Webhooks APIs under OAuth 2.0. Top strength OAuth 2.0 with two-legged and three-legged flows, read and write scopes, and Secure Service Accounts, per the published Authentication v2 spec Top weakness The Design Automation v3 guide, reference, quotas and rate limits did not render for our reader, and no OpenAPI spec for it is published in the SDK repository |
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| 1203 | SimScaleSimScale GmbH · HTTP API | CAD | E | 41 | none | n/a | n/a | Paid | API key | Local | ||
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SimScale is a cloud engineering simulation platform from SimScale GmbH in Munich. Its REST API imports geometry, builds meshes, sets up and runs fluid, structural and thermal simulations and exports results, with Python and C# SDKs, on the Enterprise plan. Top strength OpenAPI 3.0.3 for v0 (98 operations) and the v1 beta (163 operations), with separately versioned simulation and meshing schemas selectable by query parameter Top weakness API keys come only with the Enterprise plan, priced on request, and the SDK asks would-be integrators to email api@simscale.com |
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| 1214 | nTopnTopology Inc. · SDK + MCP | CAD | E | 40.2 | none | n/a | n/a | Paid | OAuth or key | Hosted | ||
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nTop is nTopology's computational design software for implicit geometry, lattices and simulation-driven parts. nTop Automate runs a notebook headlessly from the ntopcl command line with JSON in and out under a paid licence; a beta Python package reads implicit bodies. Top strength ntopcl runs a whole notebook headlessly with a JSON input file and a JSON output file, and writes both templates from the notebook with Top weakness Every geometry call needs nTop installed on Windows with a paid Automate licence; the Core package is beta, behind a login and not on PyPI |
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Nothing matches these filters. .
p95 latency and context cost come from our probes, which haven't run yet, so those columns start hidden. Grades run from AA to F, and agent-ready means BB or better. Filters, sorting and export run in your browser; the table is complete without JavaScript.
How we test this category
In this run, public evidence against the published checklist. When the task suites run, the same bracket described in words to each listing that makes geometry, the model exported as STEP and checked for its holes and dimensions, then one part quoted or one print queued where the API allows. We check the geometry, the export, the quote and what it took to get a key. This test hasn't run yet, so Task success is pending and the grades here come from the categories assessed from public evidence.
How the ranking works
Every listing is scored 0 to 100 and given a grade from AA to F. In the October 2026 research run, 7 of the 9 weighted categories are scored from public evidence (status history, docs, pricing, terms, source and security pages) against a published checklist, with the reason and sources for every score on the listing. Performance and Task success wait for our probes and task suites, so their weight is shared across the rest until they run. Negative events deduct up to 15 points. Read the methodology.
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