8 Free, Open-Source n8n Alternatives (2026)
The short version: if you specifically want a truly open-source, self-hostable automation tool, the closest match to n8n is Activepieces (MIT-licensed). Other strong picks are Windmill (code-first), Kestra (orchestration), Node-RED, Huginn, and Automatisch. One thing to clear up first: n8n itself is not OSI open source — and neither is Zapier or Make. And “free” self-hosting is only free if your time is free.
This post covers the open-source/self-host sub-cluster specifically. For the full roundup of n8n alternatives (including hosted commercial tools), see n8n alternatives.
First, clear up the n8n license confusion
People look for “open source n8n alternatives” partly because they discover n8n isn’t fully open source. It’s fair-code, released under the Sustainable Use License — the source is available and it’s free to self-host for internal business use, but you can’t resell it as a SaaS. That’s restrictive enough that it doesn’t meet the OSI definition of open source.
Worth saying plainly: Zapier and Make are not open source at all — they’re closed, cloud-only commercial products. So if open source is a hard requirement, the field narrows fast to the tools below. (For the broader “open source Zapier alternative” question, this list answers it too.)
At-a-Glance: open-source automation tools
| Tool | License | Self-host | Best for |
|---|---|---|---|
| Activepieces | MIT (true OSI) | Yes | Closest n8n replacement, no-code + code |
| Windmill | AGPLv3 | Yes | Developers who want code-first scripts + flows |
| Kestra | Apache 2.0 | Yes | Data engineering / orchestration at scale |
| Node-RED | Apache 2.0 | Yes | IoT, hardware, event wiring |
| Huginn | MIT | Yes | Monitoring/scraping “agents,” tinkerers |
| Automatisch | AGPLv3 | Yes | Simple Zapier-style flows, privacy-first |
| n8n (for reference) | Fair-code (not OSI) | Yes | Technical teams, deep AI |
1. Activepieces — the closest true open-source n8n
Activepieces is MIT-licensed — genuinely open source — and is the most direct like-for-like alternative to n8n. It has a clean visual builder, a growing catalog of connectors (“pieces”), the ability to write custom code steps, and AI features. Because it’s MIT, there are none of n8n’s resale restrictions.
Open source? Yes — MIT. Self-host? Yes (Docker). Best for: Teams who want n8n’s experience without the fair-code license. Limitations: Smaller connector library and community than n8n; some advanced features are reserved for its cloud/enterprise tier.
2. Windmill — code-first power
Windmill turns scripts (TypeScript, Python, Go, Bash, SQL) into workflows and auto-generated UIs. It’s the pick if you think in code and want flows, cron jobs, and internal tools from the same platform. Fast execution engine, strong for developer teams.
Open source? Yes — AGPLv3. Self-host? Yes. Best for: Developers who want code-first automation plus internal-tool building. Limitations: Steeper than visual no-code tools; not aimed at non-technical users.
3. Kestra — orchestration at scale
Kestra is an event-driven orchestration platform (YAML-declared workflows) built for data engineering: pipelines, scheduling, and complex dependencies. More “data orchestrator” than “app connector,” but extremely capable where reliability and scale matter.
Open source? Yes — Apache 2.0. Self-host? Yes. Best for: Data teams running pipelines and scheduled jobs. Limitations: Overkill for simple app-to-app automation; declarative YAML has a learning curve.
4. Node-RED — the wiring veteran
Node-RED is a mature, flow-based tool from the IBM/JS world, especially strong in IoT and event wiring. Its browser-based node editor is friendly, and the community node ecosystem is huge. Less “business SaaS connectors,” more “wire anything to anything.”
Open source? Yes — Apache 2.0. Self-host? Yes. Best for: IoT, hardware, and event-driven wiring. Limitations: Fewer turnkey business-app integrations; UX feels engineering-oriented.
5. Huginn — the original “agents” tool
Huginn lets you build “agents” that monitor the web, scrape, watch feeds, and act on events — a long-running open-source favorite for tinkerers. It predates the current AI-agent wave (these are rule-based agents, not LLM agents), but it’s powerful and private.
Open source? Yes — MIT. Self-host? Yes. Best for: Monitoring, scraping, and DIY automation enthusiasts. Limitations: Ruby-based, dated UI, steeper setup; not LLM-driven.
6. Automatisch — simple and privacy-first
Automatisch is a deliberately simple, Zapier-style open-source tool focused on privacy and self-hosting. Fewer integrations and features than the others, but easy to stand up if your needs are basic and you want full data control.
Open source? Yes — AGPLv3. Self-host? Yes. Best for: Simple, privacy-first flows on your own server. Limitations: Smaller integration set; less powerful logic than n8n or Make.
The honest part: “free” self-hosting isn’t free
Every tool above is free software. But running one in production means you own the infrastructure: a server, updates, monitoring, backups, security patches, and someone to fix it at 2am when a workflow breaks. A small VPS costs a few dollars a month — but a properly maintained deploy can realistically cost $200–500/mo once you count the engineering time. “Free” is only free if your time is free.
That’s the right trade for technical teams who want control and data sovereignty. It’s a bad trade for a non-technical person who just wants the work done — they end up babysitting infrastructure instead of doing their job.
If you don’t want to host (or build) anything: Carly
If the appeal of open source was “I don’t want to pay per task” rather than “I want to run my own server,” there’s a different answer. Carly is an AI executive assistant where you describe the outcome in plain English and it builds and runs the workflow for you — zero infrastructure, nothing to maintain.
- It works in email (Gmail and Outlook) and calendar, with each agent getting its own email address.
- It sends, triages, files, and updates your CRM on triggers 24/7 across 200+ integrations.
- Every step that doesn’t use AI runs free, unlimited — so you’re not metered for plumbing — while AI agents start at $35/month.
To be clear: Carly isn’t open source and isn’t self-hosted, and for pure deterministic pipelines or strict data-sovereignty requirements, the open-source tools above (or n8n self-hosted) are the right call. Carly wins when the work is email- and ops-centric, needs judgment, and you don’t want to be the builder or the sysadmin. See best no-code AI automation tools and n8n vs Zapier for the wider landscape.
Frequently Asked Questions
Is n8n open source?
Not in the OSI sense. n8n is fair-code under the Sustainable Use License — source-available and free to self-host for internal business use, but you can’t resell it as a SaaS. If you need a strictly OSI-licensed tool, Activepieces (MIT) is the closest match.
What’s the most open-source-friendly n8n alternative?
Activepieces — it’s MIT-licensed (true OSI open source), has a visual builder plus custom code, and is the most direct like-for-like replacement for n8n’s experience without the licensing restrictions.
Is there an open-source Zapier alternative?
Yes — Zapier itself is closed and cloud-only, but Activepieces, Automatisch, and Windmill all offer self-hostable, open-source automation. Activepieces and Automatisch are the closest to Zapier’s app-to-app style.
Is self-hosting an automation tool actually free?
The software is free, but running it isn’t. You pay for the server and, more significantly, the time to maintain it — updates, backups, monitoring, and debugging. A maintained production deploy can cost hundreds of dollars a month in engineering time. For non-technical users, a managed tool often costs less overall.
What if I want automation without running any infrastructure?
Use a managed tool. For deterministic plumbing, Zapier or Make. For email- and ops-centric work that needs judgment and a done-for-you setup, Carly builds and runs workflows for you with no infrastructure — non-AI steps run free, unlimited, and AI agents start at $35/month.
More: n8n alternatives · n8n vs Zapier · best no-code AI automation tools
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