Quilter vs Stagehand
A detailed comparison to help you choose between Quilter and Stagehand.
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Verdict: Stagehand wins
Stagehand scores 4.2/5, edging out Quilter at 4.0/5. Engineers building production browser agents who want natural-language actions with a Playwright escape hatch and can tolerate per-action LLM costs.
Quilter AI-powered PCB design automation for engineers | Stagehand Browser automation for complex web tasks using AI | |
|---|---|---|
| Rating | 4.0 (1 review) | 4.2 (1 review) |
| Pricing Model | freemium | free |
| Starting Price | Free tier available | Free |
| 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. | Engineers building production browser agents who want natural-language actions with a Playwright escape hatch and can tolerate per-action LLM costs. |
| Free Tier | ||
| API Access | ||
| Team Features | ||
| Open Source | ||
| Tags | free tier | free tieropen sourceapi access |
| Visit Quilter → | Visit Stagehand → |
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
Stagehand
Pros
- + MIT-licensed SDK runs locally against any Chromium browser; in my test the act() call re-resolved after I rewrote a login button's classes and wrappers, while my hand-written Playwright selector broke
- + extract() returns schema-validated typed data (pydantic/Zod/struct) — pulling an invoice table into typed fields removed the JSON cleanup step entirely
- + observe() hands back real selectors, so I filled login credentials with ordinary Playwright calls and the secrets never reached the model
- + Full TypeScript, Python and Go support from one monorepo, with deep locators that reached nested iframes and a closed shadow DOM in my runs
- + Token cost per action is a fraction of screenshot-driven agents I have tested, because page context is a trimmed accessibility tree rather than images
Cons
- - Every act/extract/observe call is an LLM round trip — my ten-step workflow ran noticeably slower than the equivalent pure Playwright script
- - Code-only: no recorder or visual builder, so non-programmers cannot build or maintain automations
- - Anti-bot features (stealth, residential proxies, verified sessions) live in paid Browserbase plans, not the free SDK
- - Pages with canvas-rendered or heavily obfuscated UIs leave the accessibility tree thin and the AI primitives degrade
- - v4 is still moving fast; I pin versions because major upgrades have meant migration work
Frequently Asked Questions
Which is better, Quilter or Stagehand?▼
Stagehand 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 Stagehand?▼
Quilter: Quilter automates printed circuit board placement and routing using physics simulation, producing layout candidates that work with Altium, Cadence and Xpedition. Stagehand: Stagehand is an SDK for building browser agents, with a Playwright-style API and selectors that repair themselves when a page changes, in TypeScript, Python and Go.
Is Quilter or Stagehand more affordable?▼
Quilter starts at €0/mo, Stagehand starts at €0/mo. Check the comparison table above for current pricing.
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