Lighthouse-MD: PageSpeed audits to CLAUDE.md

Tracking since May 16, 2026.

Changelog

• Jun 4, 2026
  description

  Turn any page's Lighthouse audit into a ready-to-use CLAUDE.md fix plan for Claude Code.
  
  Click the extension on any web page and you'll get a Google PageSpeed Insights audit (Performance, Accessibility, Best Practices, SEO) plus a structured markdown brief you can hand off to Claude Code with one click. No copy-pasting screenshots, no manually translating "Reduce unused JavaScript" into actual file changes.
  
  WHAT YOU GET
  
  • One-click analysis of the active tab — Mobile or Desktop strategy
  • All four Lighthouse score categories at a glance
  • A "CLAUDE.md" download tailored to the failing audits
  • "Ask Claude to fix problems" button — opens Claude Code (claude://code/new) with the full brief pre-loaded
  • Copy CLAUDE.md to clipboard
  • Right-click context menu: "Analyze this page" from anywhere
  • Direct link to the full Lighthouse report on pagespeed.web.dev
  
  WHAT'S IN THE CLAUDE.md
  
  For each failing audit:
  • A concrete, prescriptive fix suggestion (not just the metric)
  • The actual offending URLs, selectors, and HTML snippets ranked by potential savings (in ms or KB)
  • Stack-pack guidance — Lighthouse detects WordPress, React, Next.js, AMP, etc. and includes stack-specific tips
  
  For the page overall:
  • The Lighthouse throttling profile used (so the agent doesn't over-optimize for desktop when you measured mobile)
  • Resource breakdown by type
  • Third-party impact (entity, transfer size, main-thread time, blocking time)
  • Main-thread time breakdown
  • JavaScript bootup time per script
  • A "DO NOT BREAK" list of every currently-passing audit, so Claude knows the constraints
  
  WHO IT'S FOR
  
  • Developers using Claude Code who want measurable site performance wins
  • Indie hackers shipping fast and wanting AI to apply Lighthouse fixes
  • Performance engineers tired of translating audits into tickets
  • SEO and accessibility consultants who need a structured handoff to engineering
  
  FREE. NO SIGN-UP. NO API KEY.
  
  Powered by Google PageSpeed Insights v5.
  Try the web version: https://www.page-speed-claude.vercel.app

  Turn a Lighthouse audit into a working CLAUDE.md fix brief for Claude Code, in one click.
  
  Click the toolbar icon on any page. The extension runs a PageSpeed Insights audit on the active tab, then generates a structured CLAUDE.md you can paste into a Claude Code repo. The agent immediately knows which audits failed, the offenders behind each one, the throttling profile of the test, and the audits that are currently passing and must not regress.
  
  WHAT YOU GET
  
  - Every failing audit with measured value vs threshold
  - The specific offender list per audit: which scripts, fonts, images, DOM nodes, third-party origins
  - A prescriptive one-sentence fix per audit
  - A "currently passing, do not break" section so the agent does not regress accessibility while chasing performance
  - The Test environment block: user agent, host benchmark, throttling profile
  
  WHY THIS EXISTS
  
  Lighthouse already encodes which audits failed, the offenders per audit, the throttling profile, and the audits that are passing. Pasting the raw JSON into Claude Code flattens all that structure. This extension keeps it.
  
  WORKS WITH
  
  - Lighthouse (any version returned by PageSpeed Insights)
  - Claude Code (the CLAUDE.md convention)
  - Cursor, Aider, and other agent IDEs that read CLAUDE.md or similar instruction files
  - Any public URL reachable by Google PageSpeed Insights
  
  WHAT IT DOES NOT DO
  
  - No localhost or private URLs (PSI cannot reach them)
  - No live RUM, lab data only
  - No crawl mode, one URL at a time
  - No diff against previous runs
  
  PRIVACY
  
  The URL you submit is sent to Google PageSpeed Insights. Nothing else leaves your device. No account, no signup, no tracking beyond Chrome's standard extension telemetry. Full policy at lighthouse-md.com/privacy.
  
  USE CASES
  
  - Web performance fixes: paste the CLAUDE.md, let Claude Code fix the LCP, CLS, TBT, render-blocking audits
  - Pre-deploy checks: run on the staging URL, get the brief, fix before shipping
  - Audits of competitor or reference sites: see what Lighthouse flags, understand patterns
  - Learning Lighthouse: each failing audit comes with a prescriptive fix you can study
  
  CONTEXT
  
  This extension is one surface of a free tool at lighthouse-md.com. The web version is the same converter, accessible without installing anything. Source mapping for audit IDs lives in lib/pagespeed.js in the repo.
  
  FEEDBACK
  
  I read every review. If a particular audit is getting a weak fix suggestion, leave the audit ID in a review and I will update the mapping.

• Jun 4, 2026
  short_description

  Analyze the current page with PageSpeed Insights and generate a CLAUDE.md fix plan for Claude Code.

  Run a Lighthouse / PageSpeed Insights audit on any page, generate a CLAUDE.md fix plan for Claude Code.

• Jun 4, 2026
  name

  PageSpeed → CLAUDE.md

  Lighthouse-MD: PageSpeed audits to CLAUDE.md

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Host access

https://lighthouse-md.com/*

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