Bitbybit CAD Cloud - server-side 3D CAD over HTTP
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✦Server-side 3D CAD

BITBYBIT CAD CLOUD

Industrial CAD kernels over plain HTTP

The kernels behind our editors, running on managed compute. Call them from your backend in any language, from a nightly batch job, or from your AI coding agent, and download the result as STEP, glTF, STL or JSON.

Read the API guideSee plans and get a key
1060CAD algorithms on CAD Cloud
HTTPAny language, OpenAPI 3.1
MCPReady for AI agents
See what it does

When the browser is the wrong place

Running a geometry kernel in the browser is the right answer for an interactive configurator, and the wrong answer for a nightly batch of ten thousand parts, a quoting service that must not trust the client, a serverless function that cannot host a kernel, or an AI agent that has to hand you a file rather than code. Those belong on a server, and until now that meant licensing a desktop CAD kernel and operating it yourself.

CAD Cloud is that server. You send a request, it runs on managed compute, and you download the result in the format you need. 1060 of the algorithms you use in the editors and in the open-source packages - the OpenCascade, JSCAD, Manifold and Verb kernels, every math, vector and list helper - run there too, without hosting anything.

Who calls it

Your backend

Node, Python, Go, Java, .NET or anything else that can make a request. Generate a model from parameters, convert a STEP file, run a pipeline, download the result. A TypeScript SDK and an OpenAPI 3.1 specification are published for every endpoint.

API guide

Your AI agent

Connect the Bitbybit CAD Cloud MCP with a key and your agent runs the same operations from Claude Code, Codex, Cursor or VS Code. Ask for the volume of a STEP file, its bounding box, a filleted box as STEP or a sheet-metal flat pattern, and get the number or the file back.

CAD Cloud MCP guide

Your pipeline

Batch conversions, quoting, manufacturing exports and everything that runs unattended. Every job is a task with a status you can poll, retry or cancel, and results you download through pre-signed links.

Watch tasks in Bitbybit Studio

What you can call

  • Generate parametric models - submit parameters for a registered model and get back a downloadable 3D file.
  • Convert STEP to glTF - upload a STEP or STP file and convert it, with control over mesh precision, face merging, coordinate adjustment, texture embedding and Draco compression.
  • Run pipelines - chain primitives, booleans, transforms and fillets in a single request, where each step can reference the output of the ones before it.
  • Execute single operations - call any supported kernel operation by its fully-qualified identifier, such as occt.shapes.solid.createSphere.
  • Run Pro algorithms - sheet-metal unfolding and the other algorithms that exist only on CAD Cloud, verified against reference parts.
  • Manage tasks and files - poll, cancel, retry, list and download, and upload source files through pre-signed URLs.

How it behaves

Every request is asynchronous by design, because real CAD work is not measured in milliseconds. You submit a job, receive a task id, poll for completion, and download the result as STEP, glTF, GLB, STL, a decomposed mesh or JSON. That model holds whether the job takes two seconds or two minutes, so a slow operation never becomes a timed-out HTTP request.

Authentication is an x-api-key header on every endpoint except the health check. Keys are scoped, so a key issued for conversions cannot be used to run arbitrary kernel operations, and an agent sees only the tools its key allows.

Get access in four steps

  1. Create a free Bitbybit account, or sign in to the one you have.
  2. Pick an API plan: Starter, Professional or Business. Plans differ in included compute minutes, concurrency and overage, not in which operations you may call.
  3. Create a scoped key in Bitbybit Studio, where you also watch tasks, results and usage.
  4. Call the API, install the SDK, or hand the key to your agent's MCP configuration.
npm install @bitbybit-dev/cad-cloud-sdk
claude mcp add --transport http bitbybit-cloud https://api.bitbybit.dev/mcp --header "X-API-Key: <your key>"

Built to be called by machines, including yours

The whole surface is described by a published OpenAPI 3.1 specification, so you can generate a client in any language, import it into Postman or Insomnia, or hand it straight to an AI coding assistant. A first-party TypeScript SDK is on npm if you would rather not generate one, and two MCP servers cover the agents: a free one that documents the API, and this keyed one that runs it.

Start with a scaffolded project

The project CLI sets up a full-stack application with the API already wired in. Choose the CAD Cloud option and you get a backend - Hono on Cloudflare Workers, Node.js with Express, or ASP.NET Core - and a React and Three.js frontend that proxies requests through it, so your API key never reaches the browser. 

npx @bitbybit-dev/create-app my-project

Where to go next