ISBN Books in Claude

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Try out Artifacts created by Claude users

AI Added 9 Nov 2026 Analysed 9 Nov 2026 via Hacker News

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Screenshot of ISBN Books in Claude

What we found

  1. We found no privacy policy or terms of service.
  2. The page is missing a canonical URL.
  3. The site is served through Cloudflare, with a domain registered in 2018.

Built with: 10 technologies

Each technology links to its own page: which other new sites launched with it.

Site checks

Page basicsHow we check
Custom title and meta description
Open Graph tags (title, image, description)
Twitter card meta tags
Responsive viewport meta tag
Favicon present
Semantic HTML (nav, main, article)
Canonical URL declared
Crawl files
robots.txt
sitemap.xml 1 URLs
security.txt optional
llms.txt optional
ads.txt only for ad-funded sites
humans.txt optional
AI crawlers No stanceHow we check
llms.txt published not published
1 AI bot blocked in robots.txt the owner's choice
Content-Signal none declared
Link headers none advertised

Email

StateRecordStatusWhat it does
SPF -all Strict (-all) Lists the servers allowed to send email for the domain.
DMARC p=reject Reject (strict) Tells receivers what to do with email that fails SPF or DKIM.
DKIM Not found at common selectors Signs outgoing email. We check common selectors only, so a provider may use another.
MTA-STS Not deployed Stops email to the domain being downgraded to plain text in transit.
TLS-RPT Not configured Sends the owner reports of failed encrypted deliveries.

Hosting and network

Network ANTHROPIC - Anthropic, PBC, US AS399358, US
DNS Cloudflare DNS authoritative nameservers
DNSSEC Not enabled DNS answers are unsigned
Certificate Let's Encrypt valid 8 Nov 2026 to 6 Feb 2027, as captured
Domain age 8.3 years registered Aug 2018, MarkMonitor Inc.
Green hosting No record per The Green Web Foundation
Page build 1 JS file, 0 CSS files 2 third-party domains
Brand colours

Storage: 3 items

Cookies 3
NameLifetimeSet by
ion-vk< 1h-
_cfuvidsessionCloudflare
__cf_bm< 1hCloudflare

Performance

MeasureThis siteReading
Server response 105 ms good, faster than 80% of sites
Largest contentful paint 840 ms good
Layout shift 0.00 good
Page weight 1.7 MB fair
Third-party domains 2
Console errors 1 worth a look
Failed requests 1 worth fixing
Broken requests to the site itself (1), worth fixing
  • 403 /api/account

From a single automated render of the home page. A quick guide, not a substitute for Lighthouse or field data. How we measure

Notes

  1. Looks AI-built: no AI signals. How much the site looks AI-generated. It is a pattern match shown for interest, not a verdict.
  2. Performance comes from one render on 9 November 2026 and will vary between visits.

How we know

FirstSited records what new websites are built with, usually within a day of going live. Most we find ourselves, by watching public internet infrastructure for brand-new sites; the rest come from Product Hunt, Hacker News and PeerPush. We checked this one in full: its tech stack, DNS, security headers and page basics. This page is what we saw on 9 November 2026; the live site may have changed since.

Every technology below links to its own page: which other new sites launched with it. Watch any of them and get every new site that uses it as it goes live, from £15 a month.

Spot a mistake? If a technology shown here is wrong or out of date, email [email protected] and we'll review it.