Open-source API contract generator for SDKs, CLIs, mocks, validation, docs and MCP tools. Composable Rust and JavaScript plugins. An alternative to Speakeasy, Fern and Stainless, without the cloud or subscription.
sdk openapi api-client developer-tools codegen sdk-php sdk-generator sdk-go sdk-java sdk-elixir sdk-python speakeasy sdk-js openapi-generator sdk-rust cli-generator sdk-typescript stainless-alternative fern-alternative speakeasy-alternative
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Updated
Oct 30, 2026 - Rust