head to head · open source
Nango vs ACI.dev
Nango has 13,089 GitHub stars, 1,499 forks, 131 open issues and last shipped yesterday. ACI.dev has 4,929 stars, 486 forks, 63 open issues and last shipped 2 days ago. Nango leads on adoption by 166% (13,089 vs 4,929 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 | ★ 13K | ★ 4.9K |
| License | Custom / other | Apache-2.0 |
| Written in | TypeScript | Python |
| Last push | 2026-11-02 | 2026-11-01 |
| Forks | ⑂ 1.5K | ⑂ 486 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Nango if
- You weight community size — 13K 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
Build product integrations with AI. Connect your product & AI agents with 900+ APIs. Build, run, and maintain integrations with AI in code, on infrastructure built for scale. Website · Docs · 900+ APIs · Slack Community What is Nango? Nango is an open source platform for building product integrations. It supports 900+ APIs and works with any backend language, AI coding tool, and agent SDK. You write integration logic as TypeScript functions, or let AI generate them for you, and deploy to Nango's production runtime. Nango handles auth, execution, scaling, and observability. Used in production by Replit, Ramp…
read the full Nango 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 Nango or ACI.dev more popular?
Nango has 13,089 GitHub stars and ACI.dev has 4,929. 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 (13,089 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.