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OpenAPI Studio

openapistudio.app

From $9/mo Free plan WebSelf-hosted
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Spec score 8.1 #14 of 26 in API Design Tools

What it is

OpenAPI Studio is a visual editor for designing, testing, and publishing AI-ready APIs on the web or through self-hosted deployment. Its flow builder displays API paths as node graphs with four layout algorithms. A server-side proxy executes requests without browser CORS limitations. Recipes can chain up to 10 API calls, map responses with JSONPath, and apply assertions at each step. Every workspace includes a six-tool MCP server for searching, retrieving, creating, updating, running, and analyzing. The service supports OpenAPI, AsyncAPI, contract validation, Git synchronization, and team collaboration. WebSocket endpoints can be modeled and tested, then exported as AsyncAPI 3.0 YAML. Native integrations include GitHub, Slack, Linear, Notion, and MCP connections for AI assistants; OAuth is used and tokens are encrypted in workspaces. Roles include Owner, Editor, and Viewer. Plans are Free at free, Pro at $9 a month, Team at $29 a month, and Scale at $99 a month.

Spec sheet

Purpose
OpenAPI Studio is a visual editor for designing, testing, and publishing AI-ready APIs.Read 1 Oct 2026 · openapistudio.app
Integrations
Native integrations include GitHub, Slack, Linear, Notion, and MCP connections for AI assistants.Read 1 Oct 2026 · openapistudio.app
Support
Community support is provided through GitHub Issues on all tiers, while priority email support is available on Pro, Team, and Scale.Read 1 Oct 2026 · openapistudio.app
Maker
OpenAPI Studio is described as a solo developer project built in the open with a public codebase and transparent roadmap.Read 1 Oct 2026 · openapistudio.app
Access control
Workspaces provide Owner, Editor, and Viewer roles with enforced role-based permissions.Read 1 Oct 2026 · openapistudio.app
Data hosting
Cloud data is stored on Cloudflare D1, KV, and R2, while self-hosted deployments use the customer's Cloudflare account.Read 1 Oct 2026 · openapistudio.app
Data privacy
The service says it does not sell data, use client-side analytics, or use tracking pixels, and allows export or deletion of data.Read 1 Oct 2026 · openapistudio.app
Endpoint execution
A server-side proxy runs API requests and avoids browser CORS limitations.Read 1 Oct 2026 · openapistudio.app
Flow builder
The visual flow builder represents API paths as a node graph and supports four layout algorithms.Read 1 Oct 2026 · openapistudio.app
Integration security
Supported integrations use OAuth and store tokens encrypted in the workspace; raw API keys are not requested.Read 1 Oct 2026 · openapistudio.app
MCP server
Each workspace includes a six-tool MCP server with search, get, create, update, run, and analyze tools.Read 1 Oct 2026 · openapistudio.app
Recipes
Recipes chain up to 10 API calls, map responses with JSONPath, and apply per-step assertions.Read 1 Oct 2026 · openapistudio.app
Security limitations
SSO, SCIM, and audit logs are not yet offered.Read 1 Oct 2026 · openapistudio.app
WebSocket support
WebSocket endpoints can be modeled and tested alongside HTTP and exported as AsyncAPI 3.0 YAML.Read 1 Oct 2026 · openapistudio.app

Plans and prices

Free Free forever 1 workspace · 3 members · 7-day execution history · public hotlinks · 1 MCP token/spec · 500 MCP requests/day · no GitHub or integrations Read 1 Oct 2026 · openapistudio.app
Pro $9 a month monthly 3 workspaces · 3 members · 30-day execution history · private hotlinks · credential vault · 3 MCP tokens/spec · 2,000 MCP requests/day · no GitHub or integrations Read 1 Oct 2026 · openapistudio.app
Team $29 a month monthly Unlimited workspaces · unlimited members · 30-day execution history · private hotlinks · 5 MCP tokens/spec · 5,000 MCP requests/day · 3 integrations · 3 GitHub organizations Read 1 Oct 2026 · openapistudio.app
Scale $99 a month monthly Unlimited workspaces · unlimited members · 90-day execution history · private hotlinks · 20 MCP tokens/spec · unlimited MCP requests/day · unlimited integrations · unlimited GitHub organizations Read 1 Oct 2026 · openapistudio.app

Every OpenAPI Studio plan and price →

Strong points and limits

Strong points

  • Visual API flow builder with four layouts
  • Server proxy avoids browser CORS limits
  • Recipes support calls, JSONPath, and assertions
  • OpenAPI and AsyncAPI support
  • Free plan available

Limits

  • Free plan limits workspaces and members
  • SSO, SCIM, and audit logs unavailable
  • Free plan excludes GitHub and integrations
  • Higher MCP limits require paid plans

Who it suits

It suits API designers, developers, and teams that need visual workflows, testing, publishing, collaboration, or MCP connectivity. Self-hosting is available for organizations deploying through their own Cloudflare account.

Verdict

OpenAPI Studio combines visual API modeling with execution, recipes, MCP tooling, integrations, and collaboration. Its tiered plans and self-hosted option provide clear deployment choices, but organizations needing enterprise identity or audit controls should note those stated limitations.

Where Specifiction places it

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