head to head · open source
Jitsu vs ACI.dev
Jitsu has 5,125 GitHub stars, 405 forks, 43 open issues and last shipped yesterday. ACI.dev has 4,929 stars, 486 forks, 63 open issues and last shipped 2 days ago. Jitsu leads on adoption by 4% (5,125 vs 4,929 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 | 2026-11-02 | 2026-11-01 |
| Forks | ⑂ 405 | ⑂ 486 |
| 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
Open source event data platform. An alternative to Segment. Website · Docs · MCP Server · Jitsu Cloud · Self hosting · Slack · MIT License What is Jitsu? Jitsu collects event data from your websites, apps and servers, and delivers it to your data warehouse and to whatever other tools you use. It covers the same ground as Segment, but it's MIT licensed and self hostable, so the whole pipeline can run inside your own infrastructure — or on Jitsu Cloud, same software, hosted. Data lands in minutes, not hours: Segment loads warehouses once or twice a day (hourly at best), while Jitsu delivers per destination in…
read the full Jitsu overview →
About ACI.dev
ACI: Open Source Infra to Power Unified MCP Servers and VibeOps [!NOTE] This repo is for the ACI.dev platform. If you're looking for the Unified MCP server built with ACI.dev, see aci mcp. ACI.dev is the open source tool calling platform that hooks up 600+ tools into any agentic IDE or custom AI agent. It gives agents intent aware access to tools with multi tenant auth, granular permissions, and dynamic tool discovery—exposed as either direct function calls or through a Unified Model Context Protocol (MCP) server . Examples: Instead of writing separate OAuth flows and API clients for Google Calendar, Slack, and…
read the full ACI.dev overview →
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Frequently asked questions
Is Jitsu or ACI.dev more popular?
Jitsu has 5,125 GitHub stars and ACI.dev has 4,929. 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 (5,125 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.