head to head · open source
react vs ACI.dev
react has 250,566 GitHub stars, 51,372 forks, 1,377 open issues and last shipped yesterday. ACI.dev has 4,893 stars, 486 forks, 63 open issues and last shipped 4 months ago. react leads on adoption by 5,021% (250,566 vs 4,893 stars). react is written in JavaScript under MIT; ACI.dev is written in Python under Apache-2.0. react has attracted 21% as many forks as stars, ACI.dev 10%. react 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
| react | ACI.dev | |
|---|---|---|
| GitHub stars | ★ 251K | ★ 4.9K |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | Python |
| Last push | 2026-09-18 | 2026-05-28 |
| Forks | ⑂ 51K | ⑂ 486 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick react if
- You weight community size — 251K stars and counting
- You want the MIT license terms
- Your stack matches JavaScript
- You value the larger contributor base for long-term maintenance
pick ACI.dev if
- You want the ACI.dev 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 ACI.dev fits your workflow better
About react
React is a JavaScript library under the MIT licence for building user interfaces, using a declarative, component based model that renders both on the web and, through React Native, on mobile.
read the full react overview →
About ACI.dev
ACI.dev is an open source tool calling platform that connects more than 600 tools to any agentic IDE or custom AI agent. It lives in the Python ecosystem and is released under the Apache 2.0 license, with the backend, developer portal, and integrations all published as open source. Agents reach tools either through direct function calling or through a Unified Model Context Protocol (MCP) server, and the same capabilities are also exposed through a lightweight Python SDK and a TypeScript SDK that work with any LLM framework.
read the full ACI.dev overview →
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Frequently asked questions
Is react or ACI.dev more popular?
react has 250,566 GitHub stars and ACI.dev has 4,893. react has the larger community by that measure.
Are react and ACI.dev free?
Both are open source. react is licensed under MIT and ACI.dev under Apache-2.0. Neither carries a licence fee.
What is the difference between react and ACI.dev?
react is written in JavaScript and ACI.dev 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, react or ACI.dev?
Choose react if you want the larger community (250,566 stars) or its MIT licence terms. Choose ACI.dev if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.