Zapier alternatives that are open source: licences and hosting compared
Compare open source Zapier alternatives by licence, from permissive to source-available, and see what self-hosting costs in your time.
Aymeric Zhuo10 min read
On this page
The open source Zapier alternatives differ mainly by licence: Activepieces is MIT-licensed, n8n is source-available under a sustainable-use licence, and Windmill is code-first. "Open source" means two different things in these comparisons. It can mean a permissive licence you can build a business on, or source-available software with restrictions that people discover late.
This page covers that distinction and what self-hosting costs once somebody's time is counted. If you only want to avoid paying, the free managed tiers are the better route and need no infrastructure.
Details were checked against each project's own pages in September 2026.
What we'll cover
Key takeaways
- Check the licence before you build, because the difference between MIT and source-available matters only if you plan to sell automation as part of a product.
- Choose Activepieces if you must embed automation in a product or your policy requires a permissive licence.
- Count maintenance time when comparing cost, because the licence is free and the operation is not.
- Choose a managed plan if your only reason for open source was cost and nobody already runs servers.
- Treat security updates as your responsibility for any self-hosted instance.
Three reasons the source matters, and one that does not
Embedding it in a product you sell. If automation will be part of what your customers buy, the licence decides whether you may do that at all. The difference between licences is absolute here, not a matter of degree.
Keeping data on your own infrastructure. When you self-host, nothing passing through your automations leaves machines you control. Some regulated work requires this arrangement, and vendor assurances do not replace it.
Independence from a vendor's decisions. You can run the version you have indefinitely, so a price rise, a discontinued feature or an acquisition does not force a change on you.
The reason that usually does not hold is cost. Open source has no licence fee and is not free to operate. Whether it is cheaper than a managed plan depends on whether the maintenance time is free to you, which it is only if someone already runs infrastructure as part of their job. The section on self-hosting costs covers this.
If none of the first three applies to you, source access adds nothing, and you should choose on capability and cost like any other purchase.
The licences, precisely
Three licence types appear in this space, and you should know the difference before you build.
MIT is a permissive open-source licence. You may use, modify and redistribute the software and sell products built on it, with no obligation beyond preserving the notice. Activepieces is MIT-licensed at its core (Activepieces project page, checked September 2026).
A sustainable-use licence permits internal use, modification, and self-hosting, while restricting selling the software as a hosted service to others. n8n uses this licence (n8n documentation, checked September 2026). It is source-available, not open source under the standard definition, and for internal business automation the restriction has no effect.
AGPL requires you to publish modifications if you offer the software over a network. Some projects in this space use it. Corporate policies often restrict it, so check it against your own rules.
The practical test: if you automate your own processes, any of these licences works. If automation will be part of a product you sell, MIT is the safe choice, and the others need review by someone qualified to read licences. Discovering a conflict after months of building is expensive.
n8n
n8n is an established option with a large community.
Licence: sustainable-use. Internal use, modification and self-hosting permitted; selling it as a hosted service is not. Some enterprise features require a commercial licence.
Self-hosted: the community edition is free to run, with published container images and extensive documentation. It is heavier to operate than Activepieces, and queue mode for scaling adds operational complexity.
Cloud, if you change your mind: Starter costs £20 a month billed annually for 2,500 workflow executions, and Pro costs £50 for 10,000, with unlimited users, unlimited workflows and every integration on all plans (n8n pricing page, checked September 2026). Billing is per execution regardless of complexity, so a forty-step workflow costs the same as a three-step one.
Suits: technical teams. The node editor is visual, Code nodes take JavaScript or Python, and data moves between nodes as structured items. Learning that structure is what makes n8n productive.
The strongest argument for it: community size. Most problems you meet have already been written up by someone, which saves time when something breaks.
Activepieces
Activepieces is the permissively licensed option and the lighter one to run.
Licence: MIT at the core, with some enterprise features held separately. Choose it if you need to embed automation in something you sell.
Self-hosted: simpler to stand up and keep running than n8n, with a smaller community to turn to when something breaks.
Cloud: the Free plan costs $0 for 100 credits a day with unlimited flows. Plus costs $20 flat a month for three times that, with no daily cap and up to five users. Team costs $200 flat for five times Plus, with 25 users and single sign-on (SSO), and a custom tier sits above (Activepieces pricing page, checked September 2026). Check the pricing page for current overage rates.
Suits: teams that want an approachable builder, and AI-centred work in particular. Recent product work has focused on chat-based building, agents and tables.
The thing to check: the Free cloud plan's 100 credits are per day and do not accumulate, so bursty workloads hit the limit on busy days. Self-hosting removes that constraint, which is one of the better reasons to self-host Activepieces.
Windmill and the code-first end
Windmill suits teams that write code, because it answers a different question from n8n and Activepieces.
Windmill is an open-source platform for turning scripts into workflows and internal tools, supporting Python, TypeScript, Go and more. Instead of a visual builder with code as an extra option, Windmill treats scripts as the primary unit and composes them into flows.
Suits: engineering teams who would rather write and version a script than arrange nodes on a canvas, and who want proper testing and review around their automations.
Does not suit: teams hoping a non-developer will maintain it. That is the trade-off.
What self-hosting actually costs
The licence is free and the operation is not. This is where open-source automation projects most often disappoint.
The infrastructure is cheap: a small virtual private server (VPS) plus a database costs little each month, and your host's pricing page gives the current figure.
The time is the real cost. Initial setup takes a few hours. Ongoing work includes applying updates, verifying backups, watching monitoring, renewing certificates and performing a restore when something fails. As a rough estimate from experience, not a measured figure, allow one to two hours a month in a steady state, and more when something breaks.
At a fully loaded engineering rate, two hours a month can cost more than the managed plans discussed here. Work out the arithmetic with your own rate.
Self-hosting pays in three situations:
- High volume, where per-execution pricing would be substantial.
- Data residency requirements that rule out managed services.
- Organizations where someone already runs servers, so the extra cost of one more is close to zero.
Self-hosting does not pay when the plan is that somebody will learn on the job. The maintenance lands on top of their actual work and stays invisible until something fails. Such arrangements can end in a migration back to a managed plan, at a higher total cost than the subscription.
Deciding
Choose MIT-licensed Activepieces if you will embed automation in a product you sell, or if your organization's policy requires a permissive licence.
Choose n8n if you want the largest community and the most mature self-hosted deployment, if your team is technical, or if your workflows are complex enough that per-execution pricing matters.
Choose Windmill if your team would rather write scripts than arrange nodes, and wants version control and testing around them.
Choose a managed plan if your reason for looking at open source was cost and nobody on the team already runs infrastructure.
Choose something else if the people who understand your processes cannot build automations in any of these tools. Every option here requires learning a builder and translating a process into it. On CodeWords you describe the process in plain language, and Cody, the automation builder, builds it, connects it to your systems and deploys it, with 3,000+ integrations available. The Free plan covers light use. Pro costs $39 per month ($33 per month billed yearly) and Business costs $100 per month (CodeWords pricing page, 2026); details are on the pricing page.
Frequently asked questions
Is n8n open source?
No, not under the standard definition. Its sustainable-use licence permits internal use, modification and self-hosting while restricting selling it as a hosted service. The term for this is source-available. For internal automation it behaves like open source, and for building a product on top of it, it does not.
Which Zapier alternatives are genuinely open source?
Activepieces is MIT-licensed at its core, a conventional permissive licence. Windmill publishes its source as open source. Check the specific licence on each component you need, because several projects keep enterprise features outside the open core, and confirm the terms on the project's own repository.
Will self-hosting save me money?
At high volume with existing infrastructure capacity, yes, substantially. At low volume without it, no. A few hours of engineering time each month can cost more than a managed plan. The test is whether somebody already runs servers as part of their job.
What do I need to self-host one of these?
You need a server, a database, container tooling, and a plan for updates, backups and monitoring. If those are familiar, a few hours gets you running. If they are not, a managed plan is the better recommendation, and choosing it is not a compromise.
Can I self-host and move to cloud later, or the reverse?
Yes with n8n and Activepieces, because both offer managed versions of the same product, which makes the move easier than switching vendors. Check how workflows transfer between your own instance and the vendor's cloud before you rely on the move, and test it with one workflow first.
Do open-source options have as many integrations as Zapier?
No. n8n and Activepieces both have smaller catalogs than Zapier, and both cover mainstream tools. Each also offers a generic HTTP request step that reaches any service with an API, which makes catalog size less decisive. Check the integration list for the tools you need.
What happens when I need to upgrade a self-hosted instance?
You do it yourself, at a time you choose, after reading the release notes and taking a backup. That control is the benefit and the obligation. An instance that nobody updates accumulates security issues without warning, which is the common failure of self-hosted automation.
How much server does one of these need?
Modest use needs a small server. Memory, concurrency, long-running workflows and large file processing raise the requirement, so check each project's documentation for current guidance. Start small, watch the usage, and increase capacity when the load shows you need it, instead of provisioning for an imagined peak.
Who is responsible for security updates?
You are, entirely. Automation platforms hold credentials for every system they connect to, so an unpatched instance is a meaningful target. Subscribe to the project's release announcements and treat updates as routine maintenance, with a named person responsible for applying them.
Can I get commercial support for a self-hosted instance?
Yes. n8n and Activepieces both offer commercial arrangements alongside their open versions, according to their own sites. This suits regulated organizations that want self-hosted data residency with a vendor to call. It costs more than the managed cloud, so compare the quotes before you decide.
Does open source protect me from lock-in?
Partly. Workflows do not import directly between automation platforms, so moving between any two of these is a rebuild regardless of licence. Open source protects your ability to keep running the version you have, on your own terms. That is useful, and it is different from portability.