Website readiness profile · Snapshot 23 October 2026
cobalt.tools
cobalt.tools's public homepage, certificate and DNS checked against 31 practices and compared with 492 Web Tools sites.
- Readiness index
- 68/100
- Ahead of
- 53%
- Practices observed
- 17/29
- Popularity band
- Top 50K
Web Tools median 67
of measured Web Tools sites
2 of 31 could not be measured
Chrome UX Report top-sites list
Readiness by lane
Green: cobalt.tools. Thin bar: Web Tools peer median.
Enable
67/100
Peers 84
Harden
65/100
Peers 55
Accelerate
80/100
Peers 69
Recover
0/100
Peers 6
Priority fixes for cobalt.tools
Ordered by impact and by how common each practice is among peers.
Priority 1 · Accelerate
Static files cached for 30 days or more
Observed: A same-site stylesheet or script was cacheable for 0 seconds, short of the 30-day benchmark.
Why it matters: Returning visitors and later page views reuse cached files instead of downloading them again.
What to do: Give versioned (fingerprinted) CSS, JavaScript, fonts and images Cache-Control: public, max-age=31536000, immutable, and change the file name whenever the content changes.
On Cloudflare: Use Cache Rules to set edge and browser TTLs for static file paths.
54% of Web Tools peers do this. Limit: Read from the homepage response only; other pages or regions may send different headers.
Priority 2 · Enable
Canonical URL declared
Observed: The homepage did not declare a canonical URL.
What to do: Add a self-referencing canonical link to every indexable page, using the final https:// URL.
74% of Web Tools peers do this.
Priority 3 · Harden
DMARC policy enforces quarantine or reject
Observed: The DMARC policy for cobalt.tools was p=none, which asks receivers to take no action on failing mail.
What to do: Publish DMARC with p=none and a reporting address first, fix any legitimate senders that fail SPF or DKIM alignment, then move to quarantine and finally reject.
23% of Web Tools peers do this.
Priority 4 · Enable
Page language declared
Observed: The homepage <html> element had no lang attribute.
What to do: Set lang on the html element (for example lang="en") and on any sections in another language.
94% of Web Tools peers do this.
What cobalt.tools already does well
Practices fewer than half of Web Tools peers use.
- security.txt publishedsecurity.txt with a contact found.4.8% of peers
- DNSSEC signedDNSSEC delegation (DS record) present.9.3% of peers
- HSTS kept for at least a yearHSTS with a 365-day max-age covering subdomains.30% of peers
What we saw
- Homepage checked
- https://cobalt.tools/
- Homepage response
- HTTP 200
- TLS
- TLSv1.3, HTTP/2
- Certificate
- Google Trust Services, 90-day validity, expiring 2027-01-04
- CDN or edge
- Cloudflare
- DNS operators
- Cloudflare
- HSTS
- max-age 365 days, includeSubDomains, preload
- DMARC policy
- p=none
- Homepage HTML
- 27 KB, br
- Images on homepage
- 2 (png 2)
Limits: homepage only, one location, one moment. Header checks reflect the homepage response; other pages may differ.
Stack and providers
Seen in the homepage response, certificate and DNS. Provider pages compare how their customers configure the same checks.
All 31 checks
Select a gap for the method and fix. How each check works
Not observed 12
- CAA records limit who can issue certificates
- DMARC policy enforces quarantine or reject
- X-Content-Type-Options: nosniff
- Framing restricted
- Content Security Policy present
- Referrer-Policy set
- Static files cached for 30 days or more
- Canonical URL declared
- Structured data present
- Social preview image set
- Page language declared
- Nameservers spread across providers
Observed 17
- HTTP requests move to HTTPS
- HSTS kept for at least a year
- TLS 1.3 negotiated
- Certificate has more than 14 days left
- Certificate lifetime of 100 days or less
- DNSSEC signed
- security.txt published
- HTTP/2 negotiated
- HTTP/3 advertised
- HTML compressed
- No render-blocking scripts in <head>
- robots.txt published
- XML sitemap discoverable
- Reachable over IPv6
- Meta description written
- Mobile viewport configured
- At most one redirect to the homepage
Not measured 2
- Modern image formats in use
- Offscreen images lazy-loaded
Own cobalt.tools?
Re-run the checks after a change, or verify the site in a free workspace to save reports with history, compare against similar sites and competitors, and track a private action plan. What owners get.
Live status for this site: Status Is Down: cobalt.tools. This profile covers configuration only.