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cython.org

https://cython.org· First analyzed 01 May 2026· Updated 01 May 2026
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cython.org
Desktop screenshot of cython.org
Mobile screenshot of cython.org
Mobile

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Hosting Provider

GitHub Pages
pages.github.com

IP Address

185.199.109.153

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 San Francisco, United States

ASN

AS54113

Organization

GitHub, Inc

Server

GitHub.com

CDN

Fastly

Nameservers

pdns1.registrar-servers.com.pdns2.registrar-servers.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
614 ms10%
Speed Index
798 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
25 KB
4 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Blogger

Technology Stack

2 Technologies Detected

Analytics

1
Google Analytics

Payments

1
PayPal

SEO Analysis

D45/100
13
8
2
Meta Tags7/15
Content12/12
Headings4/8
Technical6/21
E-E-A-T0/7
Images0/7
Links4/5
URL5/5
Social0/5
Freshness0/4
Mobile4/4
Indexability3/3
C
cython.orgcython.org

Cython: C-Extensions for Python

No description available for this page.

Title Length31 chars

Recommended: 50-60 chars (~187px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

  • • Missing meta description — important for click-through rates in SERPs
  • • Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

10 issues found

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Local SEO

Local Search Readiness

1/100
Poor
16 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

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AI & LLM Readiness

F31/100
Bot Access
20/25
Machine Read.
7/25
Schema Data
0/25
Citation
4/25

AI Bot Access

14/14 accessible
AI Search
OAI-SearchBot
PerplexityBot
Claude-SearchBot
Gemini-Deep-Research
DuckAssistBot
Training
GPTBot
ClaudeBot
Google-Extended
Meta-ExternalAgent
Bytespiderinfo
Amazonbot
Applebot-Extended
CCBotinfo
Fetch
ChatGPT-User

Machine Readability

llms.txt
llms-full.txt
Semantic HTML
Heading Hierarchy
Text ratio:67%
Words:3,787
Token eff.:Poor Structure

Structured Data

No Schema

Citation Readiness

Opening Summary33w
Descriptive Headings
Canonical URL
Open Graph0/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (11)
AI readiness recommendation preview...
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Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.
C
69/100
8
Passed
5
Critical
0
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
9/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
15/15
Verifies form fields have labels, error messages are clear, and inputs are properly associated.
Color & Contrast
15/15
Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.
Keyboard & Focus
9/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
1/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
2 recommendations
  • •Accessibility recommendation preview...
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Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.
61/100
A+
3 mg
CO₂e / view
24.6 KB
Page Weight
95%
Cleaner Than
New Visitor
4 mg
vs
Returning (cached)
2 mg
Annual (10K/mo)
360 g
Emission Segments
Data Center
<0.001 g
Network
<0.001 g
Device
2 mg
Resource Breakdown
CSS
9.7 KB
HTML
14.9 KB
Green Hosting Not Verified
GitHub Pages
3 recommendations
  • •Carbon footprint recommendation preview...
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F

Security Score

0%Critical
Critical / Transactional

HTTPS

No WAF

85d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

27.04.2026

Valid Until

26.07.2026

Subject Alternative Names (1)

cython.org

SHA-256 Fingerprint

42:DD:B2:95:E7:2B:79:93:B8:85:7A:F2:85:C4:E2:FA:12:3E:EE:44...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges
bytes
access-control-allow-origin
*
age
0
cache-control
🟡 600s(max-age=600)
content-encoding
📦 Gzip(gzip)
content-length
14951
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

0

SPF
DKIM
DMARC

Domain Information

cython.org

Domain Age
18y 9m

Created

25.07.2007

Expires

25.07.2035

Last Updated

22.02.2026

Registrar

NameCheap, Inc.

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.
F
37/100
Not Mobile Friendly
Viewport Meta
The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.
Responsive Design
Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.
Touch Icons
Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.
Readable Font Size
Base font size should be at least 16px on mobile to ensure text is readable without zooming.
Relative Units
Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.
No H-Scroll Risk
No elements wider than the viewport that would cause horizontal scrolling on mobile devices.
Tap Targets OK
Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.
No Fixed Widths
No elements with fixed pixel widths that could overflow on smaller screens and break the layout.
4 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Arial

WCAG AAA
73/100
Readability
/30
21/30

16px · LH 1.40

Hierarchy
/20
11/20

2x ratio

WCAG
/25
21/25

12.61:1 min contrast

Performance
/25
20/25

System fonts

Heading Font

Arial

Sans32px

Body Font

Arial

Sans16px

Contrast Ratio

12.61:1

WCAG AAA (≥7:1)

Reading Comfort

Single Font Family

left aligned
32px
h1
16px
p

✅ Excellent readability: 16px body text is ideal for all devices.

✅ Optimal line spacing: 1.40 ratio (ideal range 1.4–1.6).

❌ Very complex text: Flesch score 29/100. Consider shorter sentences and simpler words.

✅ WCAG AAA contrast: All text meets 7:1 ratio (min 12.6:1).

⚠️ Minor heading issue: 0 level skip(s) detected. Maintain sequential order for screen readers.

✅ Strong hierarchy: Headlines are 2.0x larger than body text.

Flesch 29

Color Palette

9 unique colors
5.42:1 AA Light
#ffffff
Background· 75.3%
#696a6b
Other· 1.8%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

1
Google AnalyticsFree

User behavior and product analytics

1

Categories

1

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

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Website Identity

cython.org

18 years old
Location detected: 🇺🇸 United Statesvia ip
NameCheap, Inc.

Social Profiles

GitHubReddit

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Last analyzed: 01 May 2026 at 03:01

Historical Analysis & Change Tracking