head to head · open source
Bruno vs ATAC
Bruno has 47,022 GitHub stars, 2,888 forks, 1,831 open issues and last shipped yesterday. ATAC has 3,729 stars, 137 forks, 20 open issues and last shipped 15 days ago. Bruno leads on adoption by 1,161% (47,022 vs 3,729 stars). Bruno is written in JavaScript under MIT; ATAC is written in Rust under MIT. Bruno has attracted 6% as many forks as stars, ATAC 4%. Bruno was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (api-client), 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.
← all 8884 open source comparisons
Side by side
| Bruno | ATAC | |
|---|---|---|
| GitHub stars | ★ 47K | ★ 3.7K |
| License | MIT | MIT |
| Written in | JavaScript | Rust |
| Last push | 2026-09-17 | 2026-09-03 |
| Forks | ⑂ 2.9K | ⑂ 137 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Bruno if
- You weight community size — 47K stars and counting
- You want the MIT license terms
- Your stack matches JavaScript
- 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 Bruno
Bruno is a lightweight, open source API client and IDE for exploring and testing APIs, built for developers and teams who want their request collections stored as plain text in a folder on their own filesystem rather than in a vendor's cloud.
read the full Bruno 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.
More in Developer Tools
Related comparisons
More API Development & Testing projects
Compare either of these against the rest of the API Development & Testing field.
Frequently asked questions
Is Bruno or ATAC more popular?
Bruno has 47,022 GitHub stars and ATAC has 3,729. Bruno has the larger community by that measure.
Are Bruno and ATAC free?
Both are open source. Bruno is licensed under MIT and ATAC under MIT. Neither carries a licence fee.
What is the difference between Bruno and ATAC?
Bruno is written in JavaScript 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, Bruno or ATAC?
Choose Bruno if you want the larger community (47,022 stars) or its MIT licence terms. Choose ATAC if its feature set, stack or MIT licence fits better. Both are self-hostable.