head to head · open source
Jitsu vs ACI.dev
Jitsu has 5,083 GitHub stars, 400 forks, 43 open issues and last shipped yesterday. ACI.dev has 4,891 stars, 485 forks, 63 open issues and last shipped 4 months ago. Jitsu leads on adoption by 4% (5,083 vs 4,891 stars). Jitsu is written in TypeScript under MIT; ACI.dev is written in Python under Apache-2.0. Jitsu has attracted 8% as many forks as stars, ACI.dev 10%. Jitsu 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
| Jitsu | ACI.dev | |
|---|---|---|
| GitHub stars | ★ 5.1K | ★ 4.9K |
| License | MIT | Apache-2.0 |
| Written in | TypeScript | Python |
| Last push | 2026-09-17 | 2026-05-28 |
| Forks | ⑂ 400 | ⑂ 485 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Jitsu if
- You weight community size — 5.1K 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 Jitsu
Jitsu is an MIT licensed, self hostable open source event data platform that collects events from websites, apps and servers and delivers them to data warehouses and other tools, built as a fully scriptable alternative to Segment for data teams and developers who want the pipeline inside their own infrastructure.
read the full Jitsu 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 Jitsu or ACI.dev more popular?
Jitsu has 5,083 GitHub stars and ACI.dev has 4,891. Jitsu has the larger community by that measure.
Are Jitsu and ACI.dev free?
Both are open source. Jitsu is licensed under MIT and ACI.dev under Apache-2.0. Neither carries a licence fee.
What is the difference between Jitsu and ACI.dev?
Jitsu 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, Jitsu or ACI.dev?
Choose Jitsu if you want the larger community (5,083 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.