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BetterOpenSource

Flowise vs Windmill

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

Feature
SummaryDrag-and-drop builder for LLM apps and agents.Turn scripts into workflows and UIs.
GitHub stars35K13K
LicenseApache 2.0AGPL 3.0
LanguageTypeScriptRust
PricingFree & Open SourceFree & Open Source
Self-hostable
ReplacesOpenAI Assistants, ZapierZapier, Retool
Rating4.6 / 54.5 / 5

Flowise features

  • Visual flow editor for chains and agents
  • 100+ integrations and vector stores
  • Expose flows as REST APIs or embeds
  • Human-in-the-loop and tool calling
  • Self-hosted with team workspaces

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

Flowisepros & cons

Pros

  • Fast prototyping with no code
  • Broad integration catalog
  • Production-ready API endpoints

Cons

  • Complex agents still need careful design
  • Resource usage grows with heavy flows

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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