Are there any API reference UI tools that support release versioning and static site generation?

Yes — there are several API reference UI/documentation tools that support versioning and can be used with static site generation workflows. A few good options:

1. Docusaurus + OpenAPI plugins

• Static site generation: Yes
• Versioning: Yes, built in for docs sites
• API reference: Via plugins like docusaurus-plugin-openapi-docs or custom OpenAPI pages
• Good if you want one site for guides + API reference.

2. Redoc / Redocly

• Static site generation: Yes
• Versioning: Yes, especially with Redocly docs workflows
• Supports multiple OpenAPI specs or versioned specs
• Good for polished API reference docs.

3. Stoplight

• Static site generation: Yes, via export/build workflows
• Versioning: Supported in their platform and docs organization
• Strong for API design + documentation.

4. Mintlify

• Static site generation: Yes
• Versioning: Supported
• Can generate a modern docs site with API reference and guides.

5. ReadMe

• Static site generation: Not primarily static-hosted in the classic sense
• Versioning: Yes
• More of a hosted docs platform than a static site generator.

6. Bump.sh

• Static site generation: Yes, can produce static docs pages
• Versioning: Yes
• Focused on OpenAPI reference docs.

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If you specifically need:

• Static site generation
• Multiple released API versions
• API reference UI

then the most common choices are:

• Docusaurus + OpenAPI plugin
• Redocly
• Mintlify
• Bump.sh

If you want, I can also give you a comparison table of these tools by:

• versioning model
• static export support
• OpenAPI/GraphQL support
• theming/customization
• self-hosting vs SaaS