The most capable self-hosted Zapier alternative is n8n, but it is not open source in the OSI sense: its Sustainable Use License limits commercial use. If you want a Zapier-style builder under a real open-source license, Activepieces (MIT) is the closest match. Node-RED and Huginn are fully open source too, but they work differently from Zapier.
Why self-host your automations
Zapier charges by the number of tasks your automations run, so a busy workflow can get expensive fast. A self-hosted tool runs as many workflows as your server can handle. There is a second reason: automations often pass customer data, API keys and passwords between services. When the automation runs on your server, that data does not go through another company.
The trade-off is that you look after the server, the updates and the backups. And you lose the size of Zapier's integration catalogue. All the tools here can call any HTTP API, but ready-made connectors save a lot of time.
Licenses matter here
With automation tools the license decides what you are allowed to build, so read it before you choose.
- Open source (OSI-approved): Node-RED (Apache-2.0), Kestra (Apache-2.0), Huginn (MIT). Use them for anything, including commercial services.
- Open core: Activepieces is MIT, except for code in its enterprise folders, which is under a separate license. Automatisch is AGPL-3.0, except for files with ".ee." in their name, which fall under its Enterprise license.
- Source-available, not open source: n8n uses the Sustainable Use License. It lets you use and modify n8n "only for your own internal business purposes or for non-commercial or personal use." You may distribute it only free of charge for non-commercial purposes. Files with ".ee." in their name need a paid n8n Enterprise License.
For most people automating their own work or their own company, n8n's license is no problem. It becomes one if you want to offer n8n to your customers as part of a paid service.
Quick comparison
| Tool | Feels like Zapier? | License | Integrations | GitHub stars (Oct 2026) |
|---|---|---|---|---|
| n8n | Yes, visual workflows with code when needed | Sustainable Use License (not OSI) | 500+ on n8n's website, 1,500+ in its README | about 207,000 |
| Activepieces | Yes, very close | MIT plus enterprise folders | 280+ pieces | about 25,000 |
| Node-RED | Partly, flow-based | Apache-2.0 | 5,000+ nodes and flows | about 24,000 |
| Huginn | No, agent-based | MIT | Built-in agents | about 50,000 |
| Automatisch | Yes | AGPL-3.0 plus EE files | Smaller catalogue | about 14,000 |
| Kestra | No, YAML orchestration | Apache-2.0 | 2,200+ plugins | about 29,500 |
n8n
n8n is the most popular tool in this list by far, with about 207,000 GitHub stars. You build workflows on a canvas from nodes, and you can write JavaScript or Python anywhere in a workflow when a node does not do what you need. n8n's website names "over 500 integrations", its GitHub README "1500+". Either way it is a big catalogue. n8n has also put a lot of work into AI agents, with support for multi-agent setups, RAG and local models.
The self-hosted Community edition is free and, in n8n's words, has "almost the complete feature set." Some features need a paid plan, among them SSO, projects, environments, external secrets, workflow and credential sharing, and Git-based version control.
n8n is a good choice if you want the biggest community, lots of templates and the option to write code. We have a step-by-step guide on how to self-host n8n with Docker Compose. On a managed host such as blitz.cloud, n8n installs in one click.
Activepieces
Activepieces calls itself "an open source replacement for Zapier," and of all the tools here it is the most similar to use: a trigger, a list of steps, and a no-code builder that people outside IT can work with. Integrations are "pieces," written in TypeScript and published as npm packages. The README says there are more than 280, about 60% of them contributed by the community, and every piece is also available as an MCP server for AI assistants.
The core is MIT-licensed, so you can build commercial things with it. Enterprise features live in separate folders under their own license.
Pick Activepieces if you want something Zapier-like with a permissive license, or if non-developers will build the automations. You can run it with Docker on your own server, or on blitz.cloud, where Activepieces installs in one click.
Node-RED
Node-RED is a low-code tool for event-driven applications, run under the OpenJS Foundation. You wire nodes together into flows in a browser editor. It is popular for home automation and industrial control, and it runs "on low-cost hardware such as the Raspberry Pi" as well as in the cloud. The project counts more than 5,000 nodes and flows in its library.
It feels more like a programming tool than Zapier does: messages flow between nodes, and you often write small JavaScript functions. In exchange you get a stable, fully open-source tool (Apache-2.0) that has been around for many years.
Pick Node-RED for devices, sensors, MQTT and home automation, or if you like the flow model.
Huginn
Huginn is "a system for building agents that perform automated tasks for you online." Agents create and consume events, and you connect them into a graph. Its README calls it "a hackable version of IFTTT or Zapier on your own server."
It shines at watching things: scraping a website and emailing you when it changes, reading RSS feeds and mailboxes, tracking prices, sending digest emails. It can post to Slack and Telegram, call OpenAI-compatible APIs, and send and receive webhooks. It is MIT-licensed, written in Ruby, and the quickest way to try it is the official Docker image.
Pick Huginn for monitoring and alerting jobs. It is less suited to the "when a form is submitted, create a CRM contact" kind of workflow that Zapier is known for.
Automatisch
Automatisch is an explicit "Open Source Zapier Alternative" with a no-code builder, and its main argument is GDPR: keep your data on your own servers. The Community Edition is AGPL-3.0.
Be aware of the pace, though. According to our dataset, the latest release is v0.15.0 and the repository was last updated in January 2026, while n8n releases a new minor version most weeks. Check the current activity before you build anything important on it.
Kestra
Kestra is a declarative orchestration platform: you write workflows in YAML, version them and review them like code, and start them from schedules, events, webhooks or messages. It lists more than 2,200 plugins. The open-source edition is free to self-host on Docker or Kubernetes; SSO, RBAC, audit logs and multi-tenancy are in the Enterprise Edition.
Kestra is more for data and infrastructure teams than for replacing a few Zaps, but if your automations are really data pipelines, it is worth a look.
How to choose
- You want the most features and community, and you use it for yourself or your company: n8n.
- You need a permissive open-source license or a Zapier-like UI for non-developers: Activepieces.
- Home automation, IoT, MQTT: Node-RED.
- Watching websites, feeds and prices: Huginn.
- Data pipelines defined as code: Kestra.
Running them
All of these run in Docker. On your own server you add a reverse proxy for HTTPS, which matters here because webhooks from other services need a public HTTPS address. Back up the database and the encryption key: n8n, for example, encrypts stored credentials with a key that you cannot recover if it is lost.
If you prefer not to run a server, a managed host such as blitz.cloud offers n8n and Activepieces as one-click installs in the EU with HTTPS included. On its free plan, which needs no credit card, apps sleep after 30 minutes without visitors, which suits testing better than workflows that run on a schedule.
FAQ
Is n8n open source?
Not by the OSI definition. n8n's code is public and free to self-host, but the Sustainable Use License limits use to internal business, personal and non-commercial purposes, and enterprise files need a paid license. n8n calls this model "fair-code."
What is the best free Zapier alternative?
For self-hosting, n8n's free Community edition has the most features. If you need a truly open-source license, Activepieces.
Can these tools connect to any app?
All of them can call HTTP APIs and receive webhooks, so they can connect to almost any service with an API. Ready-made connectors are what differ: n8n and Activepieces have the largest catalogues among the Zapier-style tools.
How much server do I need?
A small server is enough to start with for most of these tools. Workflows that process large files or run many times per minute need more. Check each project's docs for requirements.