OpenAPI Studio

What OpenAPI Studio is

OpenAPI Studio is a visual editor for designing, testing, and publishing APIs for AI use. Its flow builder lays out API paths as a node graph and offers four layout algorithms. A server-side proxy executes requests, avoiding browser CORS limitations. Recipes combine as many as 10 API calls, use JSONPath to map responses, and run assertions at each step. Each workspace includes a six-tool MCP server for searching, retrieving, creating, updating, running, and analyzing API work.

The editor supports OpenAPI and AsyncAPI, contract validation, Git synchronization, and team collaboration. It can model and test WebSocket endpoints alongside HTTP, then export them as AsyncAPI 3.0 YAML. Native connections include GitHub, Slack, Linear, Notion, and MCP connections for AI assistants. Workspace roles are Owner, Editor, and Viewer. OpenAPI Studio offers web and self-hosted options. Its solo developer describes the project as built in the open, with a public codebase and transparent roadmap.

Who it suits

OpenAPI Studio suits developers who want to design and test APIs visually, build request recipes, or connect API work with AI assistants. Teams can use workspace roles and collaboration features, while self-hosting uses the customer's Cloudflare account.

Limits

The Free plan includes one workspace, three members, seven-day execution history, one MCP token per spec, and 500 MCP requests per day. It has public hotlinks and no GitHub or integrations. The Pro plan costs $9 a month and includes three workspaces, three members, 30-day execution history, three MCP tokens per spec, and 2,000 MCP requests per day; it also has no GitHub or integrations.

Getting started

1. Open https://openapistudio.app/ in a web browser, or choose the self-hosted option.
2. Start with the Free plan or choose a paid plan: Pro is $9 a month, Team is $29 a month, and Scale is $99 a month.
3. Create a workspace and assign Owner, Editor, or Viewer roles as needed.
4. Use the visual editor to model API paths, or create recipes to run API calls.

Verdict

Choose OpenAPI Studio if you want a visual API editor with request recipes, MCP tools, and support for both OpenAPI and AsyncAPI. Its free plan covers one workspace and three members; teams needing integrations, more workspaces, or longer execution history will need a paid plan. Look elsewhere if SSO, SCIM, or audit logs are required.