Carbon vs. Plex
Plex (by Rockwell) is a mature cloud ERP+MES built for high-volume, repetitive plants — capable, closed, cloud-only, and priced by quote. Carbon is open and self-hostable, exposes the whole backend over API and MCP, and runs high-volume assembly and prototype parts on one model — without the enterprise weight or lock-in.
- 4-in-1
- ERP, MRP, MES & QMS on one data model
- 1 month
- implementations
- 30 days
- free trial, no sales call
- Yours
- full source-code ownership
Carbon vs. Plex, feature by feature
| Carbon | Plex | |
|---|---|---|
| Scope & fit | ||
| What it is | ERP + MRP + MES + QMS on one data model | Cloud ERP + MES + QMS suite |
| Built for | Discrete manufacturers, from prototype to rate production | High-volume, repetitive discrete & process (automotive) |
| Volume range | High-volume assembly and prototype parts in one system | High-volume plants; not built for small runs |
| Capabilities | ||
| Shop-floor execution (MES) | Built in | Built in |
| Quality (QMS) | Built in | Built in |
| Scheduling & capacity planning | Live; updates as the floor reports | Supply-chain planning via DemandCaster module |
| Serial & batch traceability | Built in | Built in |
| Product configurator (CPQ) | Built in | Not offered |
| 3D CAD / STEP viewer | Built in | CAD-to-work-instructions authoring |
| Platform & ownership | ||
| Deployment | Cloud or self-host | Cloud-only SaaS; no on-prem |
| Full ownership of the code | Yes — the entire codebase is yours | No — proprietary |
| API coverage | Full backend over REST — every table | REST/JSON API + webhooks (selected endpoints) |
| AI / agent-ready (MCP) | Hosted MCP over the full backend | Embedded AI features; no public MCP |
| ITAR / GovCloud / CMMC | ITAR, GovCloud & CMMC / NIST 800-171 ready | IATF 16949 / automotive quality focus |
| Getting started | ||
| Implementation | Self-serve; live in days | Months to a year+; services-heavy |
| Pricing | $40–$100 / user / mo, published | Quote-only; per user + per module |
Where Plex still fits
For a Tier-1 or Tier-2 automotive supplier running high-volume lines across plants, Plex is a mature, proven cloud ERP+MES backed by Rockwell's automation ecosystem. Carbon gives you the same unified model — open, self-hostable, and transparently priced — running high-volume assembly and prototype parts side by side, without the enterprise weight or lock-in.
You may be outgrowing Plex if…
You run more than high-volume lines
Plex is built for high-volume, multi-plant production and says so. Carbon runs those same lines and the prototype and low-volume work beside them — one model, any volume.
Cloud-only, closed, and quoted
Plex holds your backend in a shared cloud you can't self-host. Carbon is open-source — own the data and run it where you like.
You want the whole backend for agents
Plex's AI is embedded features. Carbon exposes the entire backend over a hosted MCP server your agents can act on.
Why manufacturers choose Carbon
One system across every run size
Plex is built for high-volume, repetitive plants. Carbon runs high-volume assembly and one-off prototype parts on the same ERP, MRP, MES and QMS model, so mixed and low-volume work isn't a second-class fit.
Open and API-first
The whole backend is open over REST and MCP, with full source access and no lock-in. Run Carbon in the cloud or self-host it, and point the best agents (Claude, ChatGPT, Cursor) at your live data instead of a vendor's built-in assistant.
Live capacity planning built in
Plex plans demand through the separate DemandCaster module. Carbon's capacity and demand update the moment the floor reports progress — on the same record, with nothing extra to license.
Right-sized and open
Start free for 30 days on published, per-user pricing with a self-serve rollout — instead of an enterprise platform sized and priced for large plants.
See Carbon on your own parts.
Start free for 30 days, or read the source and run it in your own environment. No sales call required.
