I built a website diagnostics tool that includes over 18 audits.

Peter Freedman — Wed, 11 Mar 2026 02:07:52 +0000

I got tired of running Lighthouse for performance, Screaming Frog for SEO, axe for accessibility, and manually checking security headers — then stitching it all together into something a client could read.

So I built Site Mechanic — one scan, one report covering everything.

Performance — Lighthouse-powered Core Web Vitals (mobile + desktop)
SEO — Meta tags, headings, structured data, images, links, mobile responsiveness
Accessibility — WCAG compliance: contrast, alt text, ARIA, keyboard nav
Security — HTTP headers, SSL, mixed content, vulnerability surface
Typography — Font loading, consistency, web font optimization

Every issue is ranked by severity with code-level fix recommendations —not just "fix your meta tags" but the actual code to do it.

## The stack

Backend: Node.js, Express, SQLite (Postgres in production)
Browser automation: Puppeteer + Playwright + Lighthouse 11
PDF generation: Puppeteer renders HTML templates to PDF
AI recommendations: Claude API generates strategic analysis per report
Payments: Stripe (subscriptions, day passes, single-report purchases)
i18n: 8 languages (EN, ES, FR, DE, PT, JA, ZH, RU)
No framework — vanilla JS frontend, CSS variables for theming

## Features I'm most proud of

Client-ready PDF exports — One click generates a polished PDF with score breakdowns, prioritized fixes,
screenshots, and AI-powered strategic recommendations. Hand it to a client without any cleanup.

AI Strategic Analysis — Each report includes a Claude-generated summary that interprets scores in context,
identifies quick wins, and recommends a priority order for fixes.

Competitive Analysis — Compare your site head-to-head against competitors across all five diagnostic
categories.

View a sample PDF report

This literally started as a font scanner (the repo is still called font-scanner). I needed to audit typography across client sites. Then I added "just one more analyzer"... five times. Now it's a full diagnostics platform.

Try it
sitemechanic.io — free scans available, no account required.

Would love feedback on what analyzers or report features would be most useful for your workflow.

DEV Community: Peter Freedman

I built a website diagnostics tool that includes over 18 audits.