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Head-to-head · API Design Tools

TypeSpec vs Smithy

  • Updated Oct 2026
  • Both researched from official sources
  • 5 checks side by side
Higher score TypeSpec #7 in API Design Tools 8.3/10 Open source ✓ 3 of 6 features Visit TypeSpec
Smithy #8 in API Design Tools 8.1/10 Open source ✓ 2 of 6 features Visit Smithy

TypeSpec leads on 0 checks, Smithy on 0, and 5 are even. Who comes out ahead on the 5 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreTypeSpec · 8.3/10
  • Most featuresTypeSpec · 3 of 6

TypeSpec scores higher on our rubric for api design tools: 8.3 against 8.1 out of 10; our editors rank them #7 and #8.

TypeSpec is the better fit for teams modeling APIs for multiple generated outputs. Smithy is the better fit for teams using model-first, protocol-agnostic API design.

  • TypeSpec fits best

    Teams modeling APIs for multiple generated outputs

  • Smithy fits best

    Teams using model-first, protocol-agnostic API design

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Side by side

Feature TypeSpec 8.3/10 Visit ↗ Smithy 8.1/10 Visit ↗
At a glance
Editor score 8.3 8.1
Ranking #7 in API Design Tools #8 in API Design Tools
Best for Teams modeling APIs for multiple generated outputs Teams using model-first, protocol-agnostic API design
Pricing model Free Free
Starting price Open source Open source
Free plan Not checked yet Not checked yet
Free trial — —
Deployment Self-hosted Self-hosted
Platforms Web, Windows, macOS, Linux Windows, macOS, Linux
Support Community, Docs Community, Docs
Integrations 6 integrations 3 integrations
Built for Solo, Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features TypeSpec 3/6 · Smithy 2/6
OpenAPI support ✓ ✓
AsyncAPI support — Not checked yet
Mock server ✓ (best) Not checked yet
Contract validation ✓ (best) Not checked yet
Git synchronization Not checked yet Not checked yet
Team collaboration Not checked yet ✓ (best)
Specs
Included team seats Not checked yet Not checked yet
Our review
Pros
  • Generates OpenAPI, JSON Schema, Protobuf, client code, and server code
  • Includes validation, documentation, mock servers, and runnable projects
  • Works through a CLI, online playground, and Visual Studio extensions
  • Defines services and APIs independently of wire protocol
  • Generates client, server, and reference documentation outputs
  • Converts models to OpenAPI and supports AWS integrations
Cons
  • HTTP server and mock-project emitter features are experimental
  • Does not support AsyncAPI
  • Team collaboration features and pricing details are limited
  • Local CLI rather than a hosted API design SaaS product
  • Requires model-driven workflows and build plugins
  • Paid plans and hosted collaboration details are not provided
Our verdict

TypeSpec is an open-source language and toolset for defining API shapes, data models, operations, routes, parameters, and responses. It is aimed at API developers and teams that want one source definition to produce multiple outputs,…

Read the review →

Smithy is an open-source interface definition language and build tool for designing services and APIs. It is aimed at teams that want to define a service model once and use that model across validation, code generation, documentation, and…

Read the review →
  1. TypeSpecAPI Design Tools 8.3Open source
  2. SmithyAPI Design Tools 8.1Open source

Strengths and trade-offs

  • TypeSpec — where it wins

    • Generates OpenAPI, JSON Schema, Protobuf, client code, and server code
    • Includes validation, documentation, mock servers, and runnable projects
    • Works through a CLI, online playground, and Visual Studio extensions

    Where it doesn't

    • HTTP server and mock-project emitter features are experimental
    • Does not support AsyncAPI
    • Team collaboration features and pricing details are limited

  • Smithy — where it wins

    • Defines services and APIs independently of wire protocol
    • Generates client, server, and reference documentation outputs
    • Converts models to OpenAPI and supports AWS integrations

    Where it doesn't

    • Local CLI rather than a hosted API design SaaS product
    • Requires model-driven workflows and build plugins
    • Paid plans and hosted collaboration details are not provided
  • TypeSpec8.3/10 · Open source

    A protocol-agnostic API modeling tool for generating specs, schemas, code, and documentation.

    Visit TypeSpecFull verdict →
  • Smithy8.1/10 · Open source

    A model-first toolkit for defining, validating, transforming, and generating APIs.

    Visit SmithyFull verdict →

More comparisons

All API design tools comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update