head to head · open source
fastapi vs ruby-openai
fastapi has 104,566 GitHub stars, 10,179 forks, 78 open issues and last shipped yesterday. ruby-openai has 3,222 stars, 381 forks, 55 open issues and last shipped 6 months ago. fastapi leads on adoption by 3,145% (104,566 vs 3,222 stars). fastapi is written in Python under MIT; ruby-openai is written in Ruby under MIT. fastapi has attracted 10% as many forks as stars, ruby-openai 12%. 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 | ruby-openai | |
|---|---|---|
| GitHub stars | ★ 105K | ★ 3.2K |
| License | MIT | MIT |
| Written in | Python | Ruby |
| Last push | 2026-11-02 | 2026-05-01 |
| Forks | ⑂ 10K | ⑂ 381 |
| 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 ruby-openai if
- You want the ruby-openai feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Ruby
- You evaluated both and ruby-openai 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 ruby-openai
Ruby OpenAI Use the OpenAI API with Ruby! 🤖❤️ Stream GPT 5 chats with the Responses API, initiate Realtime WebRTC conversations, and much more... Sponsors InferToGo The inference addon for your PaaS application. SerpApi Search API Enhance your LLM's knowledge with data from search engines like Google and Bing using our simple API. 🎮 Ruby AI Builders Discord 🐦 X 🧠 Anthropic Gem 🚂 Midjourney Gem ♥️ Thanks to all sponsors! Contents Ruby OpenAI Contents Project Policies Installation Bundler Gem install How to use Quickstart With Config Custom timeout or base URI Extra Headers per Client Logging Errors Faraday…
read the full ruby-openai overview →
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Frequently asked questions
Is fastapi or ruby-openai more popular?
fastapi has 104,566 GitHub stars and ruby-openai has 3,222. fastapi has the larger community by that measure.
Are fastapi and ruby-openai free?
Both are open source. fastapi is licensed under MIT and ruby-openai under MIT. Neither carries a licence fee.
What is the difference between fastapi and ruby-openai?
fastapi is written in Python and ruby-openai in Ruby. 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 ruby-openai?
Choose fastapi if you want the larger community (104,566 stars) or its MIT licence terms. Choose ruby-openai if its feature set, stack or MIT licence fits better. Both are self-hostable.