AuditLamp is a free website audit tool that reads your site the way Google, ChatGPT, and Perplexity do. It runs 164 graded checks across technical SEO, AI crawler access, structured data, and page quality, and returns a ranked list of what is wrong in plain language. The diagnosis is free; no email required.
What does AuditLamp check?
AuditLamp is an audit engine that runs 187 documented checks against your site and grades 164 of them: 116 on-page checks covering classic search, answer boxes, AI citation, and local search, plus the 48-check Vibe Audit covering security, accessibility, and privacy, graded A+ to F per pillar and blended into the overall grade. The remaining 23 informational trust signals are reported without scoring. Every check is grounded in official documentation from the platforms and standards bodies themselves, or in published, named research. When something is a heuristic, the finding says so in plain words.
The surface is wider than an on-page scan. AuditLamp checks whether each page targets a topic and keywords people actually search, audits the local layer (service and place targeting, NAP consistency, local business schema, service and location pages), and reads domain authority and referring-domain signals from AuditLamp's own web-graph index, built from the Common Crawl domain graph with a disclosed formula. Connect Google Search Console and AuditLamp reports your real rankings, clicks and impressions, then snapshots them weekly for a before and after report. Real-user Core Web Vitals, competitor data, Google Business Profile scoring and AI-written fixes work the same way: connected feeds, honestly marked as not measured until they are on. Every scan keeps a score history, and every report gets a shareable link and an embeddable score badge.
What does AuditLamp refuse to grade?
Most audit tools inflate their scores with numbers no official search documentation supports: made-up "toxic link" scores, character-count rules, magic word counts. AuditLamp never scores you on those. Where the SEO community still tracks a number, like keyword density or text-to-HTML ratio, we will show it for reference, kept clearly separate from your grade, so you get the figure without it moving a score it was never proven to move. We would rather show you the handful of things that matter than bury them under eighty that do not. AuditLamp also tells you when something you paid for does nothing, and it grades our own site with the same engine you use.
Who builds AuditLamp?
The AuditLamp team is small on purpose. We build the engine, write every check against the source documentation, and publish the reasoning in the learn library. No outsourced content, no affiliate placements, no paid rankings. The product has one loyalty: what the documentation and the data actually say.
What we have published
In July 2026 we read the robots.txt of the 1,000 most-visited websites and measured how often each major AI crawler is blocked. The finding: 77.9% of these sites block no AI crawler at all, while OpenAI's training bot (GPTBot) is blocked nearly twice as often as its search bot (OAI-SearchBot) — 16.7% vs. 9.2%. The pattern holds across every major AI company. The full per-domain data is available as a free CSV. That study is the primary data behind the AI-visibility checks in every AuditLamp audit.
Reach us
Questions, feedback, or a check you think we got wrong: hello@auditlamp.com. If you think a finding is inaccurate, tell us. Being corrected in public is cheaper than being wrong in private.
The house rules
- Grounded. Every scored check cites official platform documentation or named research.
- Blunt, never contemptuous. Hard on the site, respectful to the person who owns it.
- Dogfooded. auditlamp.com runs through the same 164 graded checks before anything ships.
- No fabricated numbers. If we cannot measure something at your tier, we say "not measured" instead of inventing a score.