Activepieces vs Windmill

The one question that decides this

This is really the difference between a no-code automation app and a developer platform that happens to do automation. Activepieces is aiming at people who want Zapier-style flows, AI-first workflow building, and less ceremony; Windmill is aimed at people who are comfortable turning scripts into webhooks, workflows, and UIs, with more control and more responsibility. Both replace Zapier, but they do it from different philosophies: Activepieces wants you to build automations without becoming the platform, while Windmill wants the platform to be a place where scripts become the workflow.

What each one is actually trying to be

Activepieces: AI-first, no-code workflow automation.

Activepieces is optimizing for accessibility first. The tagline says it plainly: "AI-first, no-code workflow automation." The GitHub description piles on the current hype vocabulary, but the useful part is still the same old promise: workflows, agents, and connectors without making the user assemble a small internal platform before they can automate a tedious business process.

That makes Activepieces the more direct Zapier replacement for teams that care about speed and low friction. It is also explicitly trying to cover adjacent territory, since the metadata says it replaces both zapier and make. That is the broad, practical lane: fewer scripts, fewer decisions, more ready-made automation. The tradeoff is predictable. When a product centers no-code and AI-first positioning, it usually wins on approachability and loses some ground when the workflow gets weird, custom, or deeply tied to internal systems.

Windmill: Open-source developer platform to turn scripts into workflows and UIs.

Windmill is not pretending to be a cute automation toy. Its tagline is "Open-source developer platform to turn scripts into workflows and UIs." That is a very different pitch from “no-code” even if the end result sometimes looks similar. The product is built around code, scripts, and operational tooling, then wrapped in enough interface to make those scripts usable by other people.

The GitHub description is even less shy: "Open-source developer platform to power your entire infra and turn scripts into webhooks, workflows and UIs. Fastest workflow engine (13x vs Airflow). Open-source alternative to Retool and Temporal." That tells you who it wants. Windmill is for engineers who would rather own the moving parts than click together automations in a browser and hope nothing gets messy later. It still replaces Zapier, but it reaches past Zapier into Retool and Airplane territory, which is a clue that it is trying to be the place where internal tools, jobs, and automation all blur together.

Head-to-head: the metrics

Activepieces has 23,675 stars, 4,015 forks, 443 open issues, a NOASSERTION license label in the metadata here, and a last push on 2026-08-09. Windmill has 17,485 stars, 1,062 forks, 821 open issues, the same NOASSERTION license label, and the same last push date of 2026-08-09. On raw GitHub gravity, Activepieces is ahead on stars and forks, while Windmill is carrying more open issues, which can mean anything from real product complexity to a backlog that never got the memo.

What the metrics do tell us: Activepieces has broader pull in the open-source crowd, and Windmill has enough traction to keep pace without pretending it is simpler than it is. What they do not tell us: whether your team wants a no-code editor, whether your ops people are going to maintain scripts happily, or whether the “AI-first” pitch survives contact with boring business logic. Stars are a popularity contest, forks hint at reuse, and open issues mostly tell you that software is still software.

Self-hosting

Activepieces supports self-host and official-cloud, and the deploy difficulty is 2 out of 5. That fits the product’s posture. It is meant to be approachable, and the hosting story matches that: self-hosting exists, but it is not presented as a rite of passage for people who enjoy reading compose files for sport. If your priority is getting something Zapier-like running without handing the whole workflow layer to a SaaS vendor, this is the less painful route.

Windmill also supports self-host and official-cloud, but its deploy difficulty is 3 out of 5. That is still manageable, but it is a step closer to “this is a developer platform, behave like one.” The extra complexity is not accidental. Windmill is built around scripts, webhooks, and UIs, so self-hosting it makes more sense if you have enough technical maturity to want the control in the first place. In practice, that means it will fit teams that already expect to operate tooling, not just consume it.

Community signals

Activepieces had a Hacker News launch post, "Launch HN: Activepieces (YC S22) – Open-Source Zapier Alternative," which got 231 points and 62 comments. That is a solid launch signal, and the title itself makes the positioning obvious: the market understood immediately what category it was entering. There is also a Reddit post in the provided data, but it is a general SaaS-stack swap post rather than a direct product discussion, so it does not tell us much about Activepieces specifically beyond being part of the broader open-source replacement conversation.

Windmill had an HN post titled "Windmill: Open-source developer platform to turn scripts into workflows and UIs" with 428 points and 109 comments. That is stronger launch engagement than Activepieces got on HN, and it tracks with the kind of product Windmill is: more technical, more likely to trigger discussion, more likely to attract people who care about infra-adjacent tooling. The Reddit entry provided here is unrelated to the software product, so it is noise, not evidence.

What we'd do

Pick Activepieces if you want the closest thing here to a user-friendly Zapier replacement and you do not want your automation platform to feel like a side project for engineers. Pick Windmill if your real need is not just “move data from A to B,” but “run scripts, expose them cleanly, and let technical teams own the workflow layer without duct tape.” Activepieces wins for speed and reach; Windmill wins when the automation problem has already graduated into internal tooling, and you want the platform to admit that upfront.