What should I use for docs plus SDK generation?

If you want docs + SDK generation from an API spec, the best tool depends on whether you want a single integrated platform or separate best-in-class tools.

Good options

1) OpenAPI + Redocly / Swagger tools

Best if you already have or can produce an OpenAPI spec.

• Docs: Redocly, Swagger UI, Stoplight
• SDK generation: OpenAPI Generator, Swagger Codegen

Pros

• Widely supported
• Mature ecosystem
• Easy to generate SDKs for many languages
• Good fit for REST APIs

Cons

• Docs and SDK generation are often separate steps/tools
• Some setup/maintenance required

Recommendation:
If you want a practical default, use OpenAPI + Redocly for docs + OpenAPI Generator for SDKs.

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2) Fern

A strong choice if you want docs and SDKs generated together from one source of truth.

Pros

• Very good developer experience
• Generates docs, SDKs, and sometimes examples from one spec
• Clean output
• Good for modern API companies

Cons

• Less universal than OpenAPI-native tooling
• May fit best if you’re okay adopting its workflow

Recommendation:
If you want the most integrated “docs + SDKs” experience, Fern is one of the best options.

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3) Stoplight

Good for designing APIs, docs, and collaboration.

Pros

• Nice API design workflow
• Good docs
• Visual tooling for teams

Cons

• SDK generation usually still relies on OpenAPI-based generators
• More platform-heavy

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4) ReadMe

Great if your priority is polished, customer-facing API docs.

Pros

• Excellent interactive docs
• Easy to publish and maintain
• Developer portal features

Cons

• SDK generation is not its main strength
• You’ll still likely use OpenAPI Generator or similar for SDKs

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My short recommendation

• Best general-purpose setup:
  OpenAPI + Redocly + OpenAPI Generator
• Best all-in-one docs + SDK experience:
  Fern
• Best customer-facing docs portal:
  ReadMe

If you tell me these 3 things, I can recommend a specific stack:

1. Is your API REST/OpenAPI or something else?
2. Do you need SDKs in many languages?
3. Do you want a hosted docs portal or self-hosted docs?

If you want, I can also give you a “best tools by use case” matrix or a recommended stack for your exact API type.