Is ctan.org secure (HTTPS)?

Yes. ctan.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 28, 2026.

Hosting provider information for ctan.org is not available yet.

What is ctan.org's SEO score?

ctan.org scored 60/100 for SEO in the latest analysis (fair).

What is ctan.org's overall website score?

ctan.org has an overall SiteGraph score of 76/100, combining SEO, performance, security, and accessibility.

Has ctan.org's score changed over time?

ctan.org's overall score has improved by 1 point (from 75 to 76) since Jul 25, 2026.

ctan.org

CTAN: Comprehensive TeX Archive Network

Last scanned Aug 1, 2026, 7:00 AM · 15 views

Overall score

Fair

Summary

This website uses Apache. SEO is fair (60/100) and accessibility is fair (70/100). Security scores good (75/100) and performance excellent (100/100). Top issue: Missing meta description.

Top issues to fix

11 issues found · 3 high priority

Missing Content-Security-Policy header
Security
Add a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing meta description
SEO
Add a ~150-character meta description to control your search-result snippet and lift click-through rate.
Over half of images are missing alt text
Accessibility
Add alt attributes to images — screen readers depend on them, and they help image SEO.
Missing X-Content-Type-Options header
Security
Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
Security
Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Missing canonical link
SEO
Add <link rel="canonical"> so search engines know which URL variant to index.

+5 more issues — details in the sections below.

SEO

6 issue(s) found

100

Performance

253 ms

Security

HTTPS & header checks

Accessibility

1 issue(s) found

Score history

+1 overall since Jul 25, 2026

Overall: 76
SEO: 60
Security: 75
Performance: 100
Accessibility: 70

Organization

Company details published in this site's own structured data.

Facebook

Contact

Email, phone, and address published on this site's own pages.

Email: webmaster@ctan.org

Meta tags

Title: CTAN: Comprehensive TeX Archive Network
Description
Canonical
Language: en
Charset: UTF-8
Viewport: width=device-width, initial-scale=1.0
Robots meta
Manifest: https://ctan.org/assets/favicon/manifest-79a60c90526dbf14f7824aa7aa50579f.json

Technologies

Detected frameworks, languages, and tools.

Apache

Hosting & CDN

Hosting provider: —
CDN provider: —
IP address: —
ASN: —

DNS records

Type	Value
A	—
AAAA	—
MX	—
TXT	—
NS	—
CAA	—
CNAME	—
IPv6 support	No

TLS / SSL certificate

Version: TLS 1.3
Issuer: Let's Encrypt
Subject: ctan.org
Valid from: Jun 30, 2026
Valid to: Sep 28, 2026
Days until expiry: 58
SAN domains: *.ctan.org, ctan.org

Security headers

Strict-Transport-SecurityEnabled
Content-Security-PolicyMissing
X-Frame-OptionsMissing
X-Content-Type-OptionsMissing
Referrer-PolicyMissing
Permissions-PolicyMissing

Compression: gzip · 1 cookie(s) observed

Content & assets

Headings

H1 1 · H2 10 · H3 0

Links

38 internal · 11 external · 20 broken

Images

1 total · 1 missing alt

Scripts / Styles

5 scripts · 3 stylesheets

JS / CSS size

217 B · 0 B

Page size

18.9 KB

Robots.txt & Sitemap

robots.txt: Not found
Disallow rules: 0
sitemap.xml: Not found
URLs in sitemap: 0

SEO issues

Missing meta description
Missing canonical link
No structured data (JSON-LD) found
Missing OpenGraph tags
robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://ctan.org
Final URL: https://ctan.org
HTTP status: 200
HTTP version: HTTP/1.1
Response time: 253 ms
HTML size: 18.9 KB
Redirect chain: https://ctan.org

See something wrong on this report? Request a correction

Same technology stack

gopay.com

Payment gateway that helps you earn more | GoPay

100

apachegoogle-analyticsphp

AWS

clubhouseinn.com

Welcome To ClubHouse | ClubHouse Hotel & Suites

100

apachegoogle-analytics

AWS· CloudFront

buderus.com

Buderus - the system expert for HVAC

100

apachejquery

VODANET - Vodafone GmbH, DE

dorkhost.com

DorkHost Networks | Boutique Cloud Hosting

100

apache

VOXILITY - Voxility LLP, GB

boschtt.net

Home | Bosch Home Comfort Group

100

apachejquery

VODANET - Vodafone GmbH, DE

hovbi.com

Hovbi Trends — Discover What People Are Searching For

100

apachegoogle-ads

HETZNER-AS - Hetzner Online GmbH, DE

Frequently asked questions

What technology does ctan.org use?: ctan.org is built with Apache.
Is ctan.org secure (HTTPS)?: Yes. ctan.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 28, 2026.
Who hosts ctan.org?: Hosting provider information for ctan.org is not available yet.
What is ctan.org's SEO score?: ctan.org scored 60/100 for SEO in the latest analysis (fair).
What is ctan.org's overall website score?: ctan.org has an overall SiteGraph score of 76/100, combining SEO, performance, security, and accessibility.
Has ctan.org's score changed over time?: ctan.org's overall score has improved by 1 point (from 75 to 76) since Jul 25, 2026.