head to head · open source
OpenAPI-Specification vs fastapi_mcp
OpenAPI-Specification has 31,295 GitHub stars, 9,144 forks, 80 open issues and last shipped 2 days ago. fastapi_mcp has 12,026 stars, 967 forks, 169 open issues and last shipped 12 months ago. OpenAPI-Specification leads on adoption by 160% (31,295 vs 12,026 stars). OpenAPI-Specification is written in Markdown under Apache-2.0; fastapi_mcp is written in Python under MIT. OpenAPI-Specification has attracted 29% as many forks as stars, fastapi_mcp 8%. OpenAPI-Specification was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (openapi), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| OpenAPI-Specification | fastapi_mcp | |
|---|---|---|
| GitHub stars | ★ 31K | ★ 12K |
| License | Apache-2.0 | MIT |
| Written in | Markdown | Python |
| Last push | 2026-11-03 | 2025-11-24 |
| Forks | ⑂ 9.1K | ⑂ 967 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick OpenAPI-Specification if
- You weight community size — 31K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Markdown
- You value the larger contributor base for long-term maintenance
pick fastapi_mcp if
- You want the fastapi_mcp feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Python
- You evaluated both and fastapi_mcp fits your workflow better
About OpenAPI-Specification
The OpenAPI Specification The OpenAPI Specification is a community driven open specification within the OpenAPI Initiative, a Linux Foundation Collaborative Project. The OpenAPI Specification (OAS) defines a standard, programming language agnostic interface description for HTTP APIs. This allows both humans and computers to discover and understand the capabilities of a service without requiring access to source code, additional documentation, or inspection of network traffic. When properly defined via OpenAPI, a consumer can understand and interact with the remote service with a minimal amount of implementation…
read the full OpenAPI-Specification overview →
About fastapi_mcp
Built by Tadata FastAPI MCP Expose your FastAPI endpoints as Model Context Protocol (MCP) tools, with Auth! Features Authentication built in, using your existing FastAPI dependencies! FastAPI native: Not just another OpenAPI MCP converter Zero/Minimal configuration required just point it at your FastAPI app and it works Preserving schemas of your request models and response models Preserve documentation of all your endpoints, just as it is in Swagger Flexible deployment Mount your MCP server to the same app, or deploy separately ASGI transport Uses FastAPI's ASGI interface directly for efficient communication…
read the full fastapi_mcp overview →
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Frequently asked questions
Is OpenAPI-Specification or fastapi_mcp more popular?
OpenAPI-Specification has 31,295 GitHub stars and fastapi_mcp has 12,026. OpenAPI-Specification has the larger community by that measure.
Are OpenAPI-Specification and fastapi_mcp free?
Both are open source. OpenAPI-Specification is licensed under Apache-2.0 and fastapi_mcp under MIT. Neither carries a licence fee.
What is the difference between OpenAPI-Specification and fastapi_mcp?
OpenAPI-Specification is written in Markdown and fastapi_mcp in Python. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, OpenAPI-Specification or fastapi_mcp?
Choose OpenAPI-Specification if you want the larger community (31,295 stars) or its Apache-2.0 licence terms. Choose fastapi_mcp if its feature set, stack or MIT licence fits better. Both are self-hostable.