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Case study

devtools2025-2026

Rocket Vitals

Scan-first website QA tool that crawls up to 500 pages and runs 200+ checks across SEO, accessibility, performance, security, links, content, and AI readiness. Delivers prioritized reports with severity scoring, department routing, regression monitoring, and client-ready exports.

Building the tools that build the tools

Field notes

Role

Creator

Context

Rocket Park

Read order

Evidence first, then constraint → build → proof. Use the chapter rail to jump sections; orbit to adjacent work from the bottom of the case study.

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Evidence

System surface

No public screenshot on file—generative preview stands in for the visual layer.

Signature viewrocket-vitals.vercel.app
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rocket-vitals.vercel.app

Story arc

How this shipped

Building the tools that build the toolsThree beats: what pressed against the work, how the stack answered, and what changed once it was live.

I · Constraint

The brief

Website QA tools are either too simple (single-page checks) or too complex (enterprise-only pricing). Agencies need a scan-first tool that crawls entire sites and delivers prioritized, actionable reports their clients can understand.

II · Build

The craft

Built a crawler that processes up to 500 pages per scan, running 200+ checks including 34 SEO, 25+ accessibility (plus 60+ axe-core runtime checks), 24 performance, 21 security, and AI readiness checks. Reports include severity scoring, department routing, regression monitoring with configurable guardrails, and issue workflow management.

III · Proof

What moved after launch

Covers 200+ checks in a single scan. Department routing lets teams own their findings. Regression monitoring catches score drops between scans. Built at Rocket Park for production agency use.

Signals

◆Signals & scale

0
QA Checks
0
Pages per Scan
0
Check Categories

Inventory

Stack & signals

Next.jsTypeScriptPlaywrightQASEOAccessibility
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Jump Constellation

Current system: Rocket Vitals
Previous System

Specter

Current System

Rocket Vitals

Next System

CodeCraft: Galactic Developer

Nearby jumps:Precision Contrast ControlRepro-in-a-BoxAlly A11y CLI

Related work

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Cinematic-grade professional accessibility suite for designers and developers. Real-time WCAG 2.1 (AA/AAA) and APCA contrast analysis, AI-driven smart color suggestions, color blindness simulation (Protanopia, Deuteranopia, and more), semantic HTML structure analyzer, keyboard navigation checker, form accessibility validator, and image alt-text auditor.

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Repro-in-a-Box

Autonomous QA agent that finds bugs on your site, captures reproducible evidence (HAR files + screenshots), validates reproducibility, and integrates with Claude Desktop via MCP. 7 built-in detectors: JavaScript errors, network failures, broken assets, WCAG 2.1 accessibility, Core Web Vitals, mixed content, and broken links. 170 tests, 85% coverage.

Same clustersignal 3
Signal: Medium
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Ally A11y CLI

The only accessibility CLI with real-time auto-fix and impact scoring. Published on npm as ally-a11y with MIT license, GitHub Actions CI/CD, and codecov integration.

Keep exploring

Previous Project

Specter

Published npm CLI that gives your codebase a voice — speaking as it in first person. 65 commands, 14 MCP tools for Claude Desktop integration, and 12 personality modes (mentor, critic, storyteller, and more). Code archaeology, bus factor analysis, dead code detection, complexity hotspots, and impact analysis — all narrated with AI-powered context.

Next Project

CodeCraft: Galactic Developer

Educational coding game combining real programming with space colony gameplay. Three.js real-time 3D visualization, Monaco editor for live code editing, Redux state management, narrative-driven progression.

© 2026 Elizabeth Stein

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