Which is more popular, builder or Windmill?

Windmill has more GitHub stars (18,113 vs 224).

Which is more actively developed, builder or Windmill?

Windmill had more commits in the last 90 days (1,240 vs 161).

Should I use builder or Windmill?

Compare their capabilities, limitations and "best for" notes above. Both are open source, so trying each on a small task is the fastest way to decide.

builder vs Windmill

Side-by-side comparison of two AI agent tools

Short answer

Windmill is growing faster: +314 GitHub stars a month on average vs +0 for builder.
Pick builder for: aI Builder For Creating Sites and Apps. Pick Windmill for: open-source developer platform to power your entire infra and turn scripts into webhooks, workflows and UIs.

From GitHub data refreshed daily.

builderopen-source

📦✨ AI Builder For Creating Sites and Apps! An open-source alternative to Lovable, Replit, v0, and similar platforms.

Windmillopen-source

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.

Metrics

	builder	Windmill
Stars	224	18.1k
Star velocity /mo	—	314.45595854922277
Commits (90d)	161	1.2k
Releases (6m)	0	10
Overall score	0.5572442802231243	0.8084339091542341

Pros

+Multi-language support with automatic UI generation from scripts in Python, TypeScript, Go, Bash, SQL, and more
+High performance workflow engine claiming 13x faster execution than Airflow
+Self-hostable open-source solution with AGPLv3 license providing full control and customization

Cons

-AGPLv3 license may restrict some commercial use cases and require careful compliance consideration
-Being a comprehensive platform may introduce complexity for simple automation tasks
-Self-hosting requires infrastructure management and maintenance overhead

Use Cases

•Building internal APIs and webhooks from existing scripts without additional infrastructure
•Creating automated workflows for background jobs and data processing pipelines
•Developing low-code internal applications with custom UIs for non-technical team members

View builder Details View Windmill Details

FAQ

Which is more popular, builder or Windmill?: Windmill has more GitHub stars (18,113 vs 224).
Which is more actively developed, builder or Windmill?: Windmill had more commits in the last 90 days (1,240 vs 161).
Should I use builder or Windmill?: Compare their capabilities, limitations and "best for" notes above. Both are open source, so trying each on a small task is the fastest way to decide.