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BetterOpenSource

Activepieces vs Windmill

A side-by-side comparison of two open-source tools to help you choose the right one.

Feature
SummaryAll-in-one, truly open automation.Turn scripts into workflows and UIs.
GitHub stars14K13K
LicenseMITAGPL 3.0
LanguageTypeScriptRust
PricingFree & Open SourceFree & Open Source
Self-hostable
ReplacesZapier, IFTTTZapier, Retool
Rating4.6 / 54.5 / 5

Activepieces features

  • Visual flow builder with branching
  • Open-source pieces catalog
  • AI steps and chat triggers
  • Write your own pieces in TypeScript
  • Zero-cost self-hosting

Windmill features

  • Run scripts in Python, TS, Go, and Bash
  • Compose flows from scripts
  • Auto-generated UIs and apps
  • Cron scheduling and webhooks
  • Blazing-fast Rust execution engine

Activepiecespros & cons

Pros

  • Fully MIT-licensed
  • Easy to extend with custom pieces
  • Generous free self-hosting

Cons

  • Smaller integration catalog than incumbents
  • Younger ecosystem

Windmillpros & cons

Pros

  • Great for developer-led automation
  • Fast and resource-efficient
  • Scripts, flows, and apps in one

Cons

  • Code-first approach not for everyone
  • Steeper than pure no-code tools

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