Comparison
Carbon vs Mockoon
Mockoon is a lovely desktop app for clicking together a mock API without writing code. Great for demos, prototypes, and hand-off to non-engineers. Carbon aims at the other end of the workflow: mocks that engineers version in git, boot in CI, and drive from a real spec — which is not what a GUI-first tool is built for.
Capability by capability
Rows below are checked against Mockoon's public docs. Where support is "partial" we say what's actually there.
| Capability | Carbon | Mockoon | Notes |
|---|---|---|---|
| State persistence across requests | Has "data buckets" and rule-based responses; full CRUD state is manual to set up. | ||
| Snapshots / rewind (state journal) | |||
| Chaos / failure injection | Per-route latency and custom status codes; no unified chaos preset. | ||
| Multi-format ingest (OpenAPI, GraphQL, HAR, Postman, gRPC) | OpenAPI import supported; other formats: check Mockoon docs. | ||
| Local-first (runs on your laptop) | |||
| No hosted-service dependency | Mockoon Cloud is optional. | ||
| Framework glue (vitest, jest, playwright) | A CLI exists for CI, but there are no first-party test-framework bindings. | ||
| Drift detection vs real API |
When to pick Mockoon
- A designer or PM needs to build a mock without touching a terminal.
- You want a portable single-app UI for wiring up demo endpoints.
- You are prototyping and never plan to check the mock into a repo.
When to pick Carbon
- The mock has to live in git, be code-reviewable, and boot in CI.
- You want the mock built from a spec, not clicked together by hand.
- You need snapshots and chaos as first-class primitives, not per-route toggles.
Try Carbon against your own spec.
One command turns any OpenAPI, GraphQL, HAR, Postman, or gRPC spec into a stateful local server. See how it compares to Mockoon on the endpoints you actually ship.