head to head · open source
OpenCode vs ACI.dev
OpenCode has 208,150 GitHub stars, 27,350 forks, 5,727 open issues and last shipped yesterday. ACI.dev has 4,891 stars, 485 forks, 63 open issues and last shipped 4 months ago. OpenCode leads on adoption by 4,156% (208,150 vs 4,891 stars). OpenCode is written in TypeScript under MIT; ACI.dev is written in Python under Apache-2.0. OpenCode has attracted 13% as many forks as stars, ACI.dev 10%. OpenCode 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
| OpenCode | ACI.dev | |
|---|---|---|
| GitHub stars | ★ 208K | ★ 4.9K |
| License | MIT | Apache-2.0 |
| Written in | TypeScript | Python |
| Last push | 2026-09-17 | 2026-05-28 |
| Forks | ⑂ 27K | ⑂ 485 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick OpenCode if
- You weight community size — 208K stars and counting
- You want the MIT license terms
- Your stack matches TypeScript
- 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 OpenCode
OpenCode is an open source AI coding agent designed to operate across terminal, IDE, and desktop environments. It integrates directly into developer workflows to assist with writing, editing, and understanding code using natural language prompts. Built in TypeScript and licensed under MIT, it runs locally or via a desktop app and supports multiple languages and platforms.
read the full OpenCode 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 OpenCode or ACI.dev more popular?
OpenCode has 208,150 GitHub stars and ACI.dev has 4,891. OpenCode has the larger community by that measure.
Are OpenCode and ACI.dev free?
Both are open source. OpenCode is licensed under MIT and ACI.dev under Apache-2.0. Neither carries a licence fee.
What is the difference between OpenCode and ACI.dev?
OpenCode is written in TypeScript 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, OpenCode or ACI.dev?
Choose OpenCode if you want the larger community (208,150 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.