head to head · open source
ECC vs ACI.dev
ECC has 263,046 GitHub stars, 39,368 forks, 204 open issues and last shipped today. ACI.dev has 4,895 stars, 487 forks, 63 open issues and last shipped 4 months ago. ECC leads on adoption by 5,274% (263,046 vs 4,895 stars). ECC is written in JavaScript under MIT; ACI.dev is written in Python under Apache-2.0. ECC has attracted 15% as many forks as stars, ACI.dev 10%. ECC was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 4 topic tags (ai-agents, developer-tools, llm, mcp), 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
| ECC | ACI.dev | |
|---|---|---|
| GitHub stars | ★ 263K | ★ 4.9K |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | Python |
| Last push | 2026-09-20 | 2026-05-28 |
| Forks | ⑂ 39K | ⑂ 487 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick ECC if
- You weight community size — 263K 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 ECC
ECC is an MIT licensed open source agent harness performance optimization system that gives AI coding agents a coordinated engineering workflow — plan, test, implement, review, verify, remember, improve — for developers working in Claude Code, Codex, OpenCode, Cursor, and other harnesses.
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 ECC or ACI.dev more popular?
ECC has 263,046 GitHub stars and ACI.dev has 4,895. ECC has the larger community by that measure.
Are ECC and ACI.dev free?
Both are open source. ECC is licensed under MIT and ACI.dev under Apache-2.0. Neither carries a licence fee.
What is the difference between ECC and ACI.dev?
ECC 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, ECC or ACI.dev?
Choose ECC if you want the larger community (263,046 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.