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Can AI assistants read css-tricks.com?

Measured on 2026-09-15 by asking the site 5 times — once as a browser, once as each of the 4 crawlers that feed ChatGPT, Claude, Perplexity, Gemini, Meta AI, Apple Intelligence and Doubao — and comparing what came back. The AI-training opt-out tokens that never crawl are read from robots.txt instead. Tranco rank #10,499.

B75 / 100
0 of 4 crawlers can read this page.
More readable than 52% of the 47,934 sites measured so far. Structured data: Organization, WebSite, ImageObject, WebPage, Person, Article.

What each crawler got back

CrawlerHTTPResultrobots.txt
ClaudeBot (Claude)403 challenged allowed
GPTBot (ChatGPT)403 challenged allowed
OAI-SearchBot (ChatGPT Search)403 challenged allowed-by-star
PerplexityBot (Perplexity)403 challenged allowed
Google-Extended (Gemini, AI Overviews)
a robots.txt token, not a crawler: it controls how already-crawled pages may be used, and never makes a request of its own
— not opted out allowed

Cloudflare answers for this domain. Where a crawler above is refused while robots.txt allows it, the rule is applied by that edge, not written by the site — see how often each edge does this.

What to change, in order

  1. Let in the 4 crawlers your own robots.txt already allows+4 crawlers
    ClaudeBot, GPTBot, OAI-SearchBot, PerplexityBot are turned away before reading the page (served a bot challenge instead of the page), while robots.txt permits them — so this block is not written in your site. Cloudflare answers for this domain. Cloudflare applies AI-crawler blocking at the edge, independently of robots.txt (Security → Bots, plus the managed robots.txt feature). https://developers.cloudflare.com/bots/concepts/bot/ Fixing it takes this domain from 0 to 4 of 4 crawlers.

Get told if this changes

One email only when a measured crawler flips on css-tricks.com, served to refused or back. No schedule, no newsletter; double opt-in, one-click stop.

The checks

History

2026-09-13: 75 · 2026-09-15: 75

Full AI-visibility report for css-tricks.com → Scan your own site →

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Embed this score

Put the badge on css-tricks.com — it links back here, and re-measures every time this index re-crawls.

css-tricks.com AI readability: B 75/100 
<a href="https://aivis.lumnika.com/ai-readiness/css-tricks.com"><img src="https://aivis.lumnika.com/ai-readiness/css-tricks.com/badge.svg" alt="AI readability"></a>
Method. 5 live HTTP requests (one per crawler, one as a browser) plus robots.txt, llms.txt, sitemap.xml and security.txt, 12-second timeout each, from a single vantage point. Blocking AI crawlers is a legitimate choice, not a failure: this page records what is true, not what should be. Domain comes from the Tranco research list. One page per domain — the homepage — is audited.

Part of the Agent Web Index, 47,934 domains measured, updated continuously.