Calibron 12 Puzzle/Solver

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Interactive Calibron 12 puzzle and CSP solver

Games Added 8 Nov 2026 Analysed 8 Nov 2026 via Hacker News

Own this site?

Screenshot of Calibron 12 Puzzle/Solver

What we found

  1. We found no privacy policy or terms of service.
  2. Analytics set tracking cookies before any opt-in, and we found no consent manager.
  3. There are no SPF or DMARC records, so anyone can send email that claims to come from this domain.
  4. The site is hosted on Google LLC in the United States, with a domain registered in 2023.
  5. Three more gaps are listed further down the page.

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
Canonical URL declared
Responsive viewport meta tag
Favicon present
Open Graph tags (title, image, description)
Twitter card meta tags
Semantic HTML (nav, main, article)
Crawl files
robots.txt
sitemap.xml
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
No AI bots blocked in robots.txt
Content-Signal none declared
Link headers none advertised

Email

StateRecordStatusWhat it does
SPF Not published Lists the servers allowed to send email for the domain.
DMARC Not published 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.

Without SPF and DMARC, anyone can send email that claims to come from this domain. Those two are the records to add first.

Hosting and network

Network GOOGLE-CLOUD-PLATFORM - Google LLC, US AS396982, US
DNS Google Domains DNS authoritative nameservers
DNSSEC Enabled DNS answers are signed
Certificate Let's Encrypt valid 12 Oct 2026 to 10 Jan 2027, as captured
Domain age 3.5 years registered May 2023, Squarespace Domains II LLC.
Green hosting Yes per The Green Web Foundation
Page build 7 JS files, 4 CSS files 5 third-party domains, code splitting
App manifest Dawn of the Dad display standalone; 8 icons
Brand colours

Storage: 2 items

Cookies 2
NameLifetimeSet by
_ga1yGoogle Analytics
_ga_WS2FCBYJLF1yGoogle Analytics

Performance

MeasureThis siteReading
Server response 796 ms fair, faster than 15% of sites
Largest contentful paint 1,236 ms good
Layout shift 0.28 a lot
Page weight 632 KB light
Third-party domains 5
Console errors 0 none
Failed requests 0 none

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 8 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 8 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.