head to head · open source
fastapi vs emissary
fastapi has 104,542 GitHub stars, 10,173 forks, 78 open issues and last shipped 2 days ago. emissary has 4,523 stars, 712 forks, 442 open issues and last shipped 2 days ago. fastapi leads on adoption by 2,211% (104,542 vs 4,523 stars). fastapi is written in Python under MIT; emissary is written in Python under Apache-2.0. fastapi has attracted 10% as many forks as stars, emissary 16%. 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 | emissary | |
|---|---|---|
| GitHub stars | ★ 105K | ★ 4.5K |
| License | MIT | Apache-2.0 |
| Written in | Python | Python |
| Last push | 2026-11-01 | 2026-11-01 |
| Forks | ⑂ 10K | ⑂ 712 |
| 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 emissary if
- You want the emissary feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Python
- You evaluated both and emissary 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 emissary
Emissary ingress ================ [![Version][badge version img]][badge version link] [![Image Size][badge ghcr size]][badge ghcr link] [![Image Pulls][badge ghcr pulls]][badge ghcr link] [![Join Slack][badge slack img]][badge slack link] [![Core Infrastructure Initiative: Best Practices][badge cii img]][badge cii link] [badge version img]: [badge version link]: [badge ghcr size]: [badge ghcr pulls]: [badge ghcr link]: [badge slack img]: [badge slack link]: [badge cii img]: [badge cii link]: Emissary Ingress is an open source Kubernetes native API Gateway + Layer 7 load balancer + Kubernetes Ingress built on…
read the full emissary overview →
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Frequently asked questions
Is fastapi or emissary more popular?
fastapi has 104,542 GitHub stars and emissary has 4,523. fastapi has the larger community by that measure.
Are fastapi and emissary free?
Both are open source. fastapi is licensed under MIT and emissary under Apache-2.0. Neither carries a licence fee.
What is the difference between fastapi and emissary?
fastapi is written in Python and emissary 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, fastapi or emissary?
Choose fastapi if you want the larger community (104,542 stars) or its MIT licence terms. Choose emissary if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.