Quilter vs Windmill
A detailed comparison to help you choose between Quilter and Windmill.
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Verdict: Windmill wins
Windmill scores 4.2/5, edging out Quilter at 4.0/5. Engineering teams who want code-first internal tools, workflows and APIs on infrastructure they control, with no per-execution billing.
Quilter AI-powered PCB design automation for engineers | Windmill Open-source workflow automation for developers | |
|---|---|---|
| Rating | 4.0 (1 review) | 4.2 (1 review) |
| Pricing Model | freemium | freemium |
| Starting Price | Free tier available | Free tier available |
| Best For | Hardware teams with real layout bottlenecks — startups and mid-size electronics firms iterating multiple boards — that use Altium, Allegro, Xpedition or KiCad and want to trade weeks of manual placement and routing for hours of candidate review. | Engineering teams who want code-first internal tools, workflows and APIs on infrastructure they control, with no per-execution billing. |
| Free Tier | ||
| API Access | ||
| Team Features | ||
| Open Source | ||
| Tags | free tier | open sourcefree tierapi access |
| Visit Quilter → | Visit Windmill → |
Quilter
Pros
- + Per-project billing counts only unrouted pins at upload — in my test a pre-routed power section correctly reduced the design pin count, letting engineers hand off tedious routing while keeping critical RF/power work themselves
- + Unlimited free iterations per project (within 10% BOM change) plus parallel jobs meant comparing a 4-layer and 6-layer variant of one board overnight at no extra cost
- + Outputs land in native Altium, Cadence Allegro, Siemens Xpedition or KiCad formats — no proprietary lock-in, and files opened cleanly for DRC and fab prep
- + The two-to-five-cycle expectation and the circuit comprehension report are honest about where human review stays mandatory, versus one-shot-layout marketing elsewhere in this category
- + Deployment flexibility with a managed AWS cloud (SOC 2 Type 2, isolated workspaces) or self-hosted option where board data never leaves your infrastructure
Cons
- - No public per-board prices — cost is a sales conversation despite the transparent pin-count model, so budgeting is opaque before first contact
- - Free-tier designs may be made public, which excludes confidential work from the zero-cost path
- - A BOM change beyond 10% of the upload starts a new billable project, which penalises respun designs
- - Automated layout is not design validation: DRC-clean candidates still need thermal, EMC and DFM review, and the vendor's own guidance expects 2–5 iteration cycles
- - Supports four ECAD tools for output; teams on Eagle, Proteus or browser-based suites face import friction, and the company is young enough that its long-term track record is still being built
Windmill
Pros
- + Script-first model: typed functions become endpoints, jobs and flow steps with auto-generated UIs — my nightly pipeline was rebuilt in one Docker session
- + Free self-hosted tier carries unlimited executions, not a trial disguised as a plan
- + Rust execution engine kept orchestration overhead sub-second between flow steps in my tests
- + Worker-group model scales throughput with replicas and tag routing instead of redesigns
- + Transparent per-unit Enterprise pricing ($20/builder, $10/non-builder, $50/worker) with published SLA terms
Cons
- - Zero no-code path — teams without developers cannot use it at any price
- - Prebuilt Community Edition images bundle proprietary Windmill Labs terms (no resale/wrapping/modifying), separate from the AGPLv3 source build
- - Worker groups and role configuration have a real learning curve before the platform pays off
- - Small vendor (under twenty employees in 2024 reporting, ~$15M raised) relative to the incumbents it replaces
- - Flow durability is lighter than Temporal for mission-critical long-running orchestration
Frequently Asked Questions
Which is better, Quilter or Windmill?▼
Windmill scores higher at 4.2/5 vs 4.0/5 for Quilter, making it the better-rated option in our comparison.
What is the difference between Quilter and Windmill?▼
Quilter: Quilter automates printed circuit board placement and routing using physics simulation, producing layout candidates that work with Altium, Cadence and Xpedition. Windmill: Windmill is an open-source platform that turns scripts in Python, TypeScript, Go and other languages into workflows, internal apps and scheduled jobs. It is aimed at developers who prefer code over drag-and-drop builders.
Is Quilter or Windmill more affordable?▼
Quilter starts at €0/mo, Windmill starts at €0/mo. Check the comparison table above for current pricing.
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