head to head · open source
fastapi vs agent-router
fastapi has 102,409 GitHub stars, 9,906 forks, 78 open issues and last shipped 4 days ago. agent-router has 2,116 stars, 379 forks, 300 open issues and last shipped yesterday. fastapi leads on adoption by 4,740% (102,409 vs 2,116 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 18%. agent-router 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 | ★ 102K | ★ 2.1K |
| License | MIT | Apache-2.0 |
| Written in | Python | Go |
| Last push | 2026-09-14 | 2026-09-17 |
| Forks | ⑂ 9.9K | ⑂ 379 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick fastapi if
- You weight community size — 102K 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 is an MIT licensed, high performance Python web framework for building APIs with standard Python type hints, aimed at Python developers and teams that need production ready HTTP services with automatic OpenAPI documentation.
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 A…
read the full agent-router overview →
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Frequently asked questions
Is fastapi or agent-router more popular?
fastapi has 102,409 GitHub stars and agent-router has 2,116. 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 (102,409 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.