Boot a stateful mock of the Stripe API in one command. Create customers, charges, and subscriptions; Carbon persists them across requests so integration tests behave like the real thing without hitting Stripe.

A local GitHub REST v3 replica for tests and demos. Create repos, open issues, push pull requests — Carbon holds state between calls so bots and workflows can run end-to-end without touching github.com or burning your rate limit.

A stateful mock of the Notion API for docs and workspace tools. Create pages, query databases, append blocks — Carbon replays the exact shape of Notion responses without needing a real workspace token.

A local GraphQL replica of the Linear API. Query issues, mutate projects, subscribe to comments — Carbon holds workspace state between requests so your Linear-powered tool can be built and tested without connecting to a real Linear workspace.

Develop against the OpenAI API without spending tokens. Carbon serves chat completions, embeddings, files, and assistants locally with deterministic responses — perfect for CI, benchmarks, and offline demos.

Mock the Slack Web API for bots and integrations. Post messages, open conversations, react — all locally. Carbon keeps channel and user state between calls so multi-step flows behave the way a real workspace would.

Send fake SMS, MMS, and voice calls through a local Twilio replica. Carbon persists the message log and phone-number pool between requests, so your notification pipeline can be tested end-to-end without spending on real SMS.

Boot a local Shopify Admin replica for storefront and back-office development. Create products, place orders, and process fulfillments — Carbon persists shop state between requests so your commerce integration behaves like a real store.