OpenFab vs Carbon
A side-by-side look at the OpenFab and Carbon MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose OpenFab for industrial & iot work over a hosted endpoint; choose Carbon for industrial & iot over a hosted endpoint. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose OpenFab when
- You need dedicated capabilities in the Industrial & IoT domain.
- You prefer a remote HTTP/SSE transport.
- You want tools like
discover_capabilities, request_quote, refine_quote.
Choose Carbon when
- You need dedicated capabilities in the Industrial & IoT domain.
- You prefer a remote HTTP/SSE transport.
- You have the keys it needs:
CARBON_API_KEY.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Industrial & IoT | Industrial & IoT |
| Quality signal | 51/100 · Good | 57/100 · Good |
| Install command | Confirmed | Confirmed |
| Transport | Remote HTTP/SSE | Remote HTTP/SSE |
| Auth | Not declared | Not declared |
| Pricing | Not declared | Free |
| Required env vars | None listed | CARBON_API_KEY |
| Verified owner | Community listing | Community listing |
| GitHub stars | 0 | 2,758 |
| Directory activity | 1 views 0 installs 0 upvotes | 5 views 0 installs 0 upvotes |
| Tools | 7 | Not listed |
| Full listing | View OpenFab | View Carbon |
Tools & capabilities
OpenFab tools 7
discover_capabilitiesList supported manufacturing processes, materials, and the fields an estimate accepts.request_quoteGet an instant cost estimate for a custom manufactured part. Returns unit price, total, lead time, and assumptions. Indicative and non-binding.refine_quoteRefine a previous estimate (change quantity, material, tolerance, finish) by passing its quote_token.get_lead_timeEstimated production lead time in days, by process and quantity.dfm_feedbackRule-based design-for-manufacturability feedback for a part specification.estimate_bomEstimate costs for a multi-part bill of materials in one call. Each part: {process, quantity, material?, bounding_box_mm?, tolerance_mm?, finish?}. Returns per-line estimates, a BOM total, and the longest lead time. Indicative and non-binding. Max 50 lines.compare_processesCompare cost and lead time for one part across manufacturing processes. Provide 2-8 process names and a quantity; returns per-process estimates sorted by total cost, plus a lowest-cost / shortest-lead-time note. Indicative and non-binding.
Carbon tools
No tool names declared yet. Check the project README from the listing page.
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
OpenFab
{
"mcpServers": {
"openfab": {
"url": "https://openfab-22100483453.us-central1.run.app/mcp/"
}
}
}
Carbon
{
"mcpServers": {
"carbon-2": {
"url": "https://docs.carbon.ms/api/mcp"
}
}
}
Frequently asked questions
OpenFab is categorized under Industrial & IoT and uses a remote HTTP/SSE transport. Carbon belongs to Industrial & IoT and uses a remote HTTP/SSE transport. Pick OpenFab for industrial & iot work and Carbon for industrial & iot.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client.
OpenFab has no declared pricing — check the project's own site. Carbon is listed as free. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add openfab and carbon-2 as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, OpenFab has a quality signal of 51/100 (Good) with 1 views, 0 installs and 0 GitHub stars. Carbon has 57/100 (Good) with 5 views, 0 installs and 2,758 GitHub stars.