head to head · open source
fastapi vs agentgateway
fastapi has 104,566 GitHub stars, 10,179 forks, 78 open issues and last shipped yesterday. agentgateway has 5,879 stars, 1,042 forks, 258 open issues and last shipped yesterday. fastapi leads on adoption by 1,679% (104,566 vs 5,879 stars). fastapi is written in Python under MIT; agentgateway is written in Rust under Apache-2.0. fastapi has attracted 10% as many forks as stars, agentgateway 18%. agentgateway was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
← all 20902 open source comparisons
Side by side
| fastapi | agentgateway | |
|---|---|---|
| GitHub stars | ★ 105K | ★ 5.9K |
| License | MIT | Apache-2.0 |
| Written in | Python | Rust |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 10K | ⑂ 1.0K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick fastapi if
- You weight community size — 105K stars and counting
- You want the MIT license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick agentgateway if
- You want the agentgateway feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Rust
- You evaluated both and agentgateway fits your workflow better
About fastapi
FastAPI framework, high performance, easy to learn, fast to code, ready for production Documentation : Source Code : FastAPI is a modern, fast (high performance), web framework for building APIs with Python based on standard Python type hints. The key features are: Fast : Very high performance, on par with NodeJS and Go (thanks to Starlette and Pydantic). One of the fastest Python frameworks available. Fast to code : Increase the speed to develop features by about 200% to 300%. Fewer bugs : Reduce about 40% of human (developer) induced errors. Intuitive : Great editor support. Completion everywhere. Less time…
read the full fastapi overview →
About agentgateway
The first complete connectivity solution for Agentic AI. Agentgateway is an open source proxy built on AI native protocols (MCP & A2A) that provides drop in security, observability, and governance for agent to LLM, agent to tool, and agent to agent communication across any framework and environment. Intro to Agentgateway Video Key Features LLM Gateway Route traffic to major LLM providers (OpenAI, Anthropic, Gemini, Bedrock, and more) through a unified OpenAI compatible API with budget and spend controls, prompt enrichment, load balancing, and failover. MCP Gateway Connect LLMs to tools and external data sources…
read the full agentgateway overview →
More in Developer Tools
Related comparisons
More API Development & Testing projects
Compare either of these against the rest of the API Development & Testing field.
Frequently asked questions
Is fastapi or agentgateway more popular?
fastapi has 104,566 GitHub stars and agentgateway has 5,879. fastapi has the larger community by that measure.
Are fastapi and agentgateway free?
Both are open source. fastapi is licensed under MIT and agentgateway under Apache-2.0. Neither carries a licence fee.
What is the difference between fastapi and agentgateway?
fastapi is written in Python and agentgateway in Rust. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, fastapi or agentgateway?
Choose fastapi if you want the larger community (104,566 stars) or its MIT licence terms. Choose agentgateway if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.