head to head · open source
Nango vs ACI.dev
Nango has 12,203 GitHub stars, 1,353 forks, 131 open issues and last shipped yesterday. ACI.dev has 4,891 stars, 485 forks, 63 open issues and last shipped 4 months ago. Nango leads on adoption by 149% (12,203 vs 4,891 stars). Nango is written in TypeScript under a custom or non-standard licence; ACI.dev is written in Python under Apache-2.0. Nango has attracted 11% as many forks as stars, ACI.dev 10%. Nango was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (api, oauth2), 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
| Nango | ACI.dev | |
|---|---|---|
| GitHub stars | ★ 12K | ★ 4.9K |
| License | Custom / other | Apache-2.0 |
| Written in | TypeScript | Python |
| Last push | 2026-09-17 | 2026-05-28 |
| Forks | ⑂ 1.4K | ⑂ 485 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Nango if
- You weight community size — 12K stars and counting
- You want the Custom / other 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 Nango
Nango is an open source platform for building product integrations in the developer tools and integration platforms ecosystem. It connects a product and AI agents with 900+ APIs, and it lets developers write integration logic as TypeScript functions or generate that logic with an AI builder before deploying it to Nango's production runtime.
read the full Nango 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 Nango or ACI.dev more popular?
Nango has 12,203 GitHub stars and ACI.dev has 4,891. Nango has the larger community by that measure.
Are Nango and ACI.dev free?
Both are open source. Nango has no licence declared in this registry, and ACI.dev is licensed under Apache-2.0. Both are free to self-host.
What is the difference between Nango and ACI.dev?
Nango 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, Nango or ACI.dev?
Choose Nango if you want the larger community (12,203 stars) or its Custom / other licence terms. Choose ACI.dev if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.