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union vs windmill

union and windmill share 18 technologies: axum, tower, sqlx-postgres, Postgres, sqlx, Tokio, Svelte, SvelteKit, SQLite, ed25519-dalek, schemars, tracing, tracing-subscriber, tracing-opentelemetry, OpenTelemetry, opentelemetry-otlp, Tailwind CSS, and tailwind-merge. Both are written in Rust.

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What they share and what sets them apart

unionlabs

union

The trust-minimized, zero-knowledge bridging protocol, designed for censorship resistance, extremely high security, and usage in decentralized finance.

Rust73.7kRead on November 5, 2026, at commit 031785bWhat is union built with?

Only in union

In common

windmill-labs

windmill

Code-first platform for workflows, apps and AI agents, on the fastest self-hostable orchestrator (benchmarked against Airflow, Prefect and Temporal). Business teams build with AI, engineers control what ships. Open-source alternative to Lovable, Retool and n8n.

Rust18.4kRead on November 6, 2026, at commit 9ce2c6bWhat is windmill built with?

Only in windmill

Side by side

SizeLines written by people and agents, without generated ones; code files, without tests.
union468,416 lines written1,841 code files
windmill1,458,145 lines written4,587 code files
Who writes itA commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch.
union0% of its commits signed by AIWith CodeRabbit
windmill18.1% of its commits signed by AIWith Claude Code
ActivityFrom GitHub and its history, on the day SeeRepo read it.
unionLast push July 25, 202613,299 commits73,725 stars
windmillLast push November 6, 202615,630 commits18,428 stars
TestsThe files that test the code, and the share of code files a test imports.
union120 test files10.4% of its code files have a test that imports them
windmill803 test files9.7% of its code files have a test that imports them

Frequently asked questions

Which is bigger, union or windmill?
windmill, with 1,458,145 lines written; union has 468,416.

The proof: windmill-labs/windmill's code at commit 9ce2c6b

Which has more GitHub stars, union or windmill?
union, with 73,725 stars; windmill has 18,428.

The proof: unionlabs/union on GitHub

Which has more tests, union or windmill?
windmill, with 803 test files; union has 120.

The proof: windmill-labs/windmill's code at commit 9ce2c6b

Which was updated more recently, union or windmill?
windmill: its last push was on November 6, 2026, and union's on July 25, 2026.

The proof: windmill-labs/windmill's commits on GitHub

Which has more commits signed by AI, union or windmill?
windmill: an AI signed 18.1% of its commits, with Claude Code.

The proof: the commits each tool signed in windmill-labs/windmill

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