🌍 100% Open-Source • Self-host or use the cloud

The open-source platform for API documentation

Design, document and evolve APIs with diagrams, data flows and specs — all in one transparent, community-driven platform.

AGPL-3.0-style freedom • No vendor lock-in

Everything your API needs

Built for engineers, product teams and organizations that care about clarity and ownership.

Visualize how data moves between services, APIs and systems.

Document payloads, mappings and transformations with precision.

Native support for Swagger / OpenAPI specs with version awareness.

Create clear system diagrams for alignment and onboarding.

Centralize structured data without losing context.

Collaborative documentation with full ownership.

Plan releases, integrations and API lifecycles visually.

ApiVersion is built in the open. You can inspect the code, self-host it, extend it and contribute back to the community.

Your data, your infrastructure, your rules.

Deploy on your own servers or use our hosted cloud.

Improve the platform together with other teams.