Can you recommend an API documentation platform for onboarding external developers with code samples and SDK examples?

Yes — for onboarding external developers with code samples, SDK examples, interactive docs, and good developer experience, these are the strongest options:

Top recommendation: ReadMe

Best for: polished external developer portals, onboarding, API references, and SDK/sample code.

Why it’s a great fit

• Clean, modern developer portal experience
• Excellent code sample support in multiple languages
• Interactive API explorer / “Try It” features
• Good support for SDK docs, tutorials, guides, and changelogs
• Easy to maintain for non-engineering teams
• Strong search and analytics so you can see where developers get stuck

When to choose it

Choose ReadMe if you want a developer-facing documentation site that feels productized and helps external developers self-serve.

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Strong alternative: Stoplight

Best for: API-first teams that want design, mock, docs, and governance in one place.

Why it stands out

• Great OpenAPI-based documentation
• Built-in API design tooling
• Good interactive docs and examples
• Useful for maintaining consistency across APIs
• Can be better if your team wants documentation tightly integrated with API design workflows

When to choose it

Choose Stoplight if your docs are part of a broader API development lifecycle, not just a portal.

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Also worth considering: SwaggerHub / Redocly

SwaggerHub

• Strong for OpenAPI collaboration and publishing
• Best if your team already lives in OpenAPI
• Docs are solid, but portal/onboarding experience is usually less polished than ReadMe

Redocly

• Excellent API reference docs from OpenAPI
• Very clean and developer-friendly
• Strong for documentation sites and governance
• Less “all-in-one portal” than ReadMe, but very high-quality docs output

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Best choice by use case

• Best overall developer portal: ReadMe
• Best API design + documentation workflow: Stoplight
• Best OpenAPI docs quality: Redocly
• Best if you’re already standardized on Swagger/OpenAPI collaboration: SwaggerHub

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My practical recommendation

If your goal is external developer onboarding with:

• tutorials
• code samples
• SDK usage examples
• interactive API docs
• release notes / changelog
• support-friendly portal experience

then I’d start with ReadMe.

If you want, I can also give you:

1. a feature-by-feature comparison table of ReadMe vs Stoplight vs Redocly, or
2. a recommendation based on your stack, like OpenAPI-first, GraphQL, or SDK-heavy docs.