head to head · open source
fastapi vs ATAC
fastapi has 102,402 GitHub stars, 9,903 forks, 78 open issues and last shipped 4 days ago. ATAC has 3,729 stars, 137 forks, 20 open issues and last shipped 15 days ago. fastapi leads on adoption by 2,646% (102,402 vs 3,729 stars). fastapi is written in Python under MIT; ATAC is written in Rust under MIT. fastapi has attracted 10% as many forks as stars, ATAC 4%. fastapi was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (api), so they are genuine substitutes rather than adjacent tools.
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 | ATAC | |
|---|---|---|
| GitHub stars | ★ 102K | ★ 3.7K |
| License | MIT | MIT |
| Written in | Python | Rust |
| Last push | 2026-09-14 | 2026-09-03 |
| Forks | ⑂ 9.9K | ⑂ 137 |
| 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 ATAC if
- You want the ATAC feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Rust
- You evaluated both and ATAC 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 ATAC
ATAC is a terminal API client written in Rust and licensed under MIT. It lives in the developer tools and API development and testing ecosystem, and it targets users who want a Postman like workflow without leaving a terminal. The project describes itself as Arguably a Terminal API Client, and it is based on clients such as Postman, Insomnia, and Bruno.
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Frequently asked questions
Is fastapi or ATAC more popular?
fastapi has 102,402 GitHub stars and ATAC has 3,729. fastapi has the larger community by that measure.
Are fastapi and ATAC free?
Both are open source. fastapi is licensed under MIT and ATAC under MIT. Neither carries a licence fee.
What is the difference between fastapi and ATAC?
fastapi is written in Python and ATAC in Rust. 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 ATAC?
Choose fastapi if you want the larger community (102,402 stars) or its MIT licence terms. Choose ATAC if its feature set, stack or MIT licence fits better. Both are self-hostable.