Smithy

5.7easy start · #21 of 26
in API Design Tools

Free to practise onnot on record
Free trialnot on record
Well documentednot on record
Runs where you workyes

Runs on Linux, Mac, Windows.

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Smithy is ranked #21 of 26 in API design tools on The Geeks Club. It runs on Linux, macOS, Windows.

Compared on API design tools

OpenAPI support: Yes
Team collaboration: Yes

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The record

Product: Smithy is an open-source, protocol-agnostic interface definition language and toolset for defining APIs and generating clients, servers, and documentation.
Code generation: A single model can generate type-safe client SDKs in ten languages, server code, API reference documentation, OpenAPI, and JSON Schema.
API protocols: The same service model can support REST JSON, RPC v2 CBOR, AWS JSON, and AWS Query/XML protocols.
Governance: Smithy validates model standards during smithy build and checks model revisions for backward compatibility.
Modeling: Smithy supports resource-based API modeling, which can be used to generate artifacts including CloudFormation schemas, SDKs, and documentation.
AWS use: Smithy says it was created and is used at AWS, and that it powers AWS APIs and SDKs.
License: The project is open source under the Apache 2.0 license.
CLI: The Smithy CLI can build models, run ad hoc validation, compare models, and query models without requiring users to set up Java or Smithy Gradle Plugins.
Supported CLI platforms: The Smithy CLI is supported on macOS x86 and ARM, Linux x86 and ARM, and Windows x64.
Download verification: Smithy CLI release archives are PGP-signed and hashed, and the installation guide describes verifying their signatures and checksums.
Integrations: Smithy build configurations can load extensions and code generators through Maven dependencies and plugins, including AWS-specific dependencies and an OpenAPI generator.
Support: The CLI guide directs users with suggestions or issues to create an issue in the Smithy GitHub repository.
Intended users: Smithy is presented for teams defining service APIs and generating SDKs, server code, and documentation across programming languages.

Where it ranks on The Geeks Club

Best API Design Tools in 2026#21 of 26

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Sources

smithy.io· checked 4 Oct 2026
smithy.io/2.0/guides/smithy-cli/index.html· checked 4 Oct 2026
smithy.io/2.0/guides/smithy-cli/cli_installation.· checked 4 Oct 2026
smithy.io/2.0/guides/smithy-build-json.html· checked 4 Oct 2026