head to head · open source
fastapi vs agent-router
fastapi has 104,566 GitHub stars, 10,179 forks, 78 open issues and last shipped yesterday. agent-router has 2,334 stars, 445 forks, 300 open issues and last shipped 5 days ago. fastapi leads on adoption by 4,380% (104,566 vs 2,334 stars). fastapi is written in Python under MIT; agent-router is written in Go under Apache-2.0. fastapi has attracted 10% as many forks as stars, agent-router 19%. fastapi 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.
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Side by side
| fastapi | agent-router | |
|---|---|---|
| GitHub stars | ★ 105K | ★ 2.3K |
| License | MIT | Apache-2.0 |
| Written in | Python | Go |
| Last push | 2026-11-02 | 2026-10-29 |
| Forks | ⑂ 10K | ⑂ 445 |
| 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 agent-router if
- You want the agent-router feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Go
- You evaluated both and agent-router 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 agent-router
The open source control plane for AI and agent traffic, powered by Envoy. An Agentic AI Foundation project. Formerly Envoy AI Gateway . Documentation · Quickstart · Blog · Release Notes · Talks Agent Router Agent Router gives application teams one consistent, OpenAI compatible API for every model and tool, from hosted providers to self hosted inference and MCP servers. Platform teams keep credentials, routing, quotas, failover, and usage attribution in one place, enforced by Envoy and Envoy Gateway. Agent Router controls. Envoy carries. Formerly Envoy AI Gateway Envoy AI Gateway is now Agent Router , an Agentic…
read the full agent-router overview →
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Frequently asked questions
Is fastapi or agent-router more popular?
fastapi has 104,566 GitHub stars and agent-router has 2,334. fastapi has the larger community by that measure.
Are fastapi and agent-router free?
Both are open source. fastapi is licensed under MIT and agent-router under Apache-2.0. Neither carries a licence fee.
What is the difference between fastapi and agent-router?
fastapi is written in Python and agent-router in Go. 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 agent-router?
Choose fastapi if you want the larger community (104,566 stars) or its MIT licence terms. Choose agent-router if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.