structurizr
★ 487
vs
fastapi_mcp
★ 12.0k
structurizr vs fastapi_mcp
structurizr: Structurizr is a "models as code" tool that helps create multiple software architecture diagrams from a single model using its DSL, based on the C4 model. It offers both a web-based playground and a local Docker-based solution for diagram generation.; fastapi_mcp: FastAPI-MCP allows you to expose your existing FastAPI endpoints as Model Context Protocol (MCP) tools. It offers native integration with FastAPI, including built-in authentication using existing dependencies, and preserves schemas and documentation.
01
TL;DR
structurizrDev Tooling · ★ 487
Documenting software architecture for various systems.
fastapi_mcpDev Tooling · ★ 12.0k
When to choose:
- You already have a FastAPI application and want to expose its endpoints as MCP tools while reusing your existing FastAPI authentication dependencies and Swagger schemas.
- You want to mount the MCP server directly onto your ASGI app or deploy it separately under an MIT license.
When to skip:
- You are building a standalone MCP server from scratch rather than wrapping a FastAPI app; use FastMCP or the official MCP Python SDK.
- You need an actively updated repository (last push was November 2025).
02
Side-by-Side Comparison
Field
structurizrfastapi_mcpCategory
Dev Tooling
Dev Tooling
Stars
★ 487
★ 12.0k
License
Apache-2.0
MIT
Install Command
docker pull structurizr/on-premises-api && docker run -it --rm -p 8080:8080 -v "$(pwd)":/usr/local/structurizr structurizr/on-premises-api
uv add fastapi-mcp
Updated
2w ago
11mo ago
Open Source
Yes
Yes
Tags
Software Architecture, C4 Model, Diagramming
FastAPI, MCP, Python
03
Features
structurizr01Applies a "models as code" approach for architecture definition.
02Generates multiple software architecture diagrams from a single model.
03Provides native support and is the reference implementation for the C4 model.
04Utilizes Structurizr DSL for defining architectural models.
fastapi_mcp01Authentication built in, using your existing FastAPI dependencies!
02FastAPI-native: Not just another OpenAPI -> MCP converter
03Zero/Minimal configuration required
04Preserving schemas of your request models and response models
05Flexible deployment - Mount your MCP server to the same app, or deploy separately
04
Use Cases
structurizr↳Documenting software architecture for various systems.
↳Visualizing complex software systems with C4 diagrams.
↳Ensuring compliance and compatibility with the C4 model standard.
fastapi_mcp↳Integrating FastAPI services as tools for large language models (LLMs) that support MCP.
↳Enabling LLMs to interact with and utilize existing business logic and data exposed via FastAPI.
↳Quickly exposing authenticated FastAPI APIs as discoverable and usable tools within an MCP ecosystem.
05
Best For
structurizr—
fastapi_mcpMost PopularEssential
FAQ
FAQ
What is the difference between structurizr and fastapi_mcp?
Both structurizr and fastapi_mcp are in the Dev Tooling category. structurizr has 487 stars, while fastapi_mcp has 12.0k stars.
Which is better, structurizr or fastapi_mcp?
The best choice depends on your use case. Choose structurizr if Documenting software architecture for various systems., and fastapi_mcp if Integrating FastAPI services as tools for large language models (LLMs) that support MCP..
Is structurizr free or open source?
Yes, structurizr is open source on GitHub (Apache-2.0).
Is fastapi_mcp free or open source?
Yes, fastapi_mcp is open source on GitHub (MIT).
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