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cncfstack.com

https://cncfstack.com· First analyzed 01 May 2026· Updated 01 May 2026
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cncfstack.com
Desktop screenshot of cncfstack.com
Mobile screenshot of cncfstack.com
Mobile

Sponsored

Hosting Provider

IDC, China Telecommunications Corporation

IP Address

220.181.141.166

Site Location

🇨🇳 Chinavia ip

Server Location

🇨🇳 Beijing, China

ASN

AS23724

Server

ESA

Performance

87

Core Web Vitals

Weight

First Contentful Paint
1.6 s10%
Speed Index
2.1 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
1.9 MB
59 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
IDC, China Telecommunications Corporation

Technology Stack

9 Technologies Detected

Advertising

4
Google AdsGoogle AdSenseCriteoOutbrain

CSS Frameworks

2
Tailwind CSS
Ant Design

Icon Libraries

1
Material Icons

Fonts

1
Google Fonts

Payments

1
Square

SEO Analysis

D51/100
14
10
0
Meta Tags7/15
Content9/12
Headings6/8
Technical18/25
E-E-A-T0/7
Images0/7
Links0/5
URL5/5
Social0/5
Freshness0/4
Mobile3/4
Indexability3/3
C
cncfstack.comcncfstack.com

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Description truncated.
Title Length11 chars

Recommended: 50-60 chars (~66px / 580px)

Description Length661 chars

Recommended: 120-160 chars

Issues (0)

    10 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: index

    68 URLs

    68 sub-sitemaps

    robots.txt

    3 rules

    Sitemap reference found

    Local SEO

    Local Search Readiness

    3/100
    Poor
    1 14 2

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

    Sponsored

    AI & LLM Readiness

    F33/100
    Bot Access
    20/25
    Machine Read.
    4/25
    Schema Data
    0/25
    Citation
    9/25

    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:11%
    Words:8,101
    Token eff.:Excessive
    Sections/1K:1.9

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary85w
    Descriptive Headingsavg 3.5w
    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...
    Upgrade to view recommendations

    Sponsored

    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.
    B
    79/100
    12
    Passed
    4
    Critical
    0
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    12/20
    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
    11/15
    Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
    ARIA & Roles
    6/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
    1 recommendation
    • •Accessibility recommendation preview...
    Upgrade to view recommendations

    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.
    24/100
    D
    241 mg
    CO₂e / view
    1.9 MB
    Page Weight
    50%
    Cleaner Than
    New Visitor
    275 mg
    vs
    Returning (cached)
    138 mg
    Annual (10K/mo)
    28.9 kg
    Emission Segments
    Data Center
    54 mg
    Network
    58 mg
    Device
    129 mg
    Resource Breakdown
    JavaScript
    1.6 MB
    Images
    285.7 KB
    CSS
    54.4 KB
    Fonts
    6.2 KB
    HTML
    1.5 KB
    Green Hosting Not Verified
    IDC, China Telecommunications Corporation
    6 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    F

    Security Score

    0%Critical
    Critical / Transactional

    HTTPS

    No WAF

    85d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    ZeroSSL GmbH

    Key Algorithm

    ECDSA (secp256r1) (256 bit)

    Signature

    ECDSA with SHA-256

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2

    Valid From

    26.04.2026

    Valid Until

    25.07.2026

    OCSP Stapling

    Enabled

    Subject Alternative Names (8)

    cncfstack.com*.cncfstack.com*.cs.cncfstack.com*.registry.cncfstack.com*.website.cncfstack.comcs.cncfstack.comregistry.cncfstack.comwebsite.cncfstack.com

    SHA-256 Fingerprint

    80:A5:6E:70:E8:E7:B7:57:F2:F9:BD:70:69:B9:76:67:C8:48:F7:0B...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    access-control-allow-credentials
    true
    access-control-allow-headers
    DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Cont...
    access-control-allow-methods
    GET,OPTIONS
    access-control-allow-origin
    *
    cache-control
    🔴 No Cache(no-cache, no-store, must-revalidate)
    content-encoding
    📦 Gzip(gzip)
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    0

    SPF
    DKIM
    DMARC

    Domain Information

    cncfstack.com

    Domain Age
    6y 2m

    Created

    17.02.2020

    Expires

    17.02.2027

    Last Updated

    18.02.2025

    Registrar

    Alibaba Cloud Computing (Beijing) Co., Ltd.

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Quantcast Choice

    Cookie Consent Banner
    Quantcast Choice
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Cookie consent banner detected
    CMP: Quantcast Choice
    Privacy policy page linked
    Legitimate interest basis mentioned

    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.
    B
    74/100
    Mobile Friendly11 breakpoints
    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.
    Viewport
    width=device-width, initial-scale=1.0
    1 recommendation
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Open Sans

    WCAG Partial
    59/100
    Readability
    /30
    12/30

    12px · LH 1.33

    Hierarchy
    /20
    13/20

    1.46x ratio · ✓ H1→H6

    WCAG
    /25
    16/25

    1:1 min contrast

    Performance
    /25
    18/25

    2 fonts · 2 req

    Heading Font

    Open Sans

    Sans18px

    Body Font

    Open Sans

    Sans12px

    Contrast Ratio

    1:1

    23 issues

    Reading Comfort

    ~39 CPL

    Narrow lines
    18px
    h1
    24px
    h2
    19px
    h3
    12px
    p
    Minor Second
    Scale

    ❌ Critical: 12px body text is too small. Minimum 14px, recommend 16px+.

    ⚠️ Tight line spacing (1.33). Increase to 1.4–1.6 for better readability.

    ⚠️ Partial contrast: 23 elements below WCAG AA threshold (min 1.0:1).

    ✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

    ⚠️ Weak hierarchy: Headlines should be ≥2x body size for clear visual structure.

    ✅ Lean font stack: 2 font families keeps load times fast.

    GGoogle Fonts

    Color Palette

    4 unique colors
    5.74:1 AA Dark
    #666666
    Other· 66%
    #ffffff
    Background· 22.6%
    #1f2e5d
    Primary· 8.2%
    #bfc7d1
    Secondary· 3.3%

    Business & Marketing Stack

    2 Tools Detected

    Advanced

    Behavior Analytics

    1
    Google AnalyticsFree

    User behavior and product analytics

    Advertising

    1
    Google AdsEnterprise

    Ad platforms and retargeting pixels

    2

    Categories

    2

    Total Tools

    1

    Enterprise

    0

    Mid-Market

    Assessment: Well-developed marketing technology stack

    Ad Networks

    Google AdSenseMedia.netSovrnPubMaticOpenXIndex Exchange

    Sponsored

    Scripts & Styles

    11 Resources

    6
    Scripts
    5
    Styles
    3
    Async
    1
    Defer

    Top Script Sources

    pagead2.googlesyndication.com(2)fundingchoicesmessages.google.com(2)umami.cncfstack.com(1)local(1)

    Website Identity

    cncfstack.com

    6 years old
    Location detected: 🇨🇳 Chinavia ip
    Alibaba Cloud Computing (Beijing) Co., Ltd.en

    Sponsored

    Last analyzed: 01 May 2026 at 10:31

    Historical Analysis & Change Tracking