head to head · open source
openapi-generator vs fastapi_mcp
openapi-generator has 26,752 GitHub stars, 7,678 forks, 5,752 open issues and last shipped 3 days ago. fastapi_mcp has 12,007 stars, 969 forks, 169 open issues and last shipped 10 months ago. openapi-generator leads on adoption by 123% (26,752 vs 12,007 stars). openapi-generator is written in Java under Apache-2.0; fastapi_mcp is written in Python under MIT. openapi-generator has attracted 29% as many forks as stars, fastapi_mcp 8%. openapi-generator 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-generator | fastapi_mcp | |
|---|---|---|
| GitHub stars | ★ 27K | ★ 12K |
| License | Apache-2.0 | MIT |
| Written in | Java | Python |
| Last push | 2026-09-17 | 2025-11-24 |
| Forks | ⑂ 7.7K | ⑂ 969 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick openapi-generator if
- You weight community size — 27K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Java
- 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-generator
OpenAPI Generator is an Apache 2.0 licensed Java tool that generates API client libraries, server stubs, documentation, and configuration automatically from an OpenAPI Specification, and it is built for development teams that keep a machine readable API description and want generated code to stay in step with it.
read the full openapi-generator overview →
About fastapi_mcp
FastAPI MCP is an MIT licensed Python library from Tadata that exposes the endpoints of an existing FastAPI application as Model Context Protocol (MCP) tools, so MCP clients such as Claude and Cursor can call a team's own API, and it is built for Python backend developers who already run FastAPI services and want agent access without hand writing a separate MCP server.
read the full fastapi_mcp overview →
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Frequently asked questions
Is openapi-generator or fastapi_mcp more popular?
openapi-generator has 26,752 GitHub stars and fastapi_mcp has 12,007. openapi-generator has the larger community by that measure.
Are openapi-generator and fastapi_mcp free?
Both are open source. openapi-generator is licensed under Apache-2.0 and fastapi_mcp under MIT. Neither carries a licence fee.
What is the difference between openapi-generator and fastapi_mcp?
openapi-generator is written in Java 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-generator or fastapi_mcp?
Choose openapi-generator if you want the larger community (26,752 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.