head to head · open source
fastapi vs ruby-openai
fastapi has 102,402 GitHub stars, 9,903 forks, 78 open issues and last shipped 4 days ago. ruby-openai has 3,224 stars, 383 forks, 55 open issues and last shipped 5 months ago. fastapi leads on adoption by 3,076% (102,402 vs 3,224 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 | ★ 102K | ★ 3.2K |
| License | MIT | MIT |
| Written in | Python | Ruby |
| Last push | 2026-09-14 | 2026-05-01 |
| Forks | ⑂ 9.9K | ⑂ 383 |
| 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 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 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 ruby-openai
ruby openai is a Ruby client library for the OpenAI API, released under the MIT license, and it is listed in the Developer Tools / API Development & Testing category. The repository has 3,222 stars, 383 forks, and a six year age, with the last push recorded on 2026 05 01T14:37:06Z. It lives in the Ruby and Rails ecosystem, and its topics include ai, api client, chatgpt, dall e, gpt 4, gpt 4o, o1, openai, rails, ruby, and whisper.
read the full ruby-openai overview →
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Frequently asked questions
Is fastapi or ruby-openai more popular?
fastapi has 102,402 GitHub stars and ruby-openai has 3,224. 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 (102,402 stars) or its MIT licence terms. Choose ruby-openai if its feature set, stack or MIT licence fits better. Both are self-hostable.