zkoss.org

https://zkoss.org· First analyzed 25 May 2026· Updated 25 May 2026

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zkoss.org

Mobile

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

104.26.12.187

Site Location

🇨🇦 Canadavia ip

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

violet.ns.cloudflare.com.nick.ns.cloudflare.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

626 ms10%

Speed Index

814 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

1.5 MB

91 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Cloudflare

CDN

Cloudflare

Technology Stack

8 Technologies Detected

Libraries

UI Components

CSS Frameworks

Icon Libraries

Fonts

Analytics

Advertising

CDN

SEO Analysis

C67/100

Meta Tags14/15

Content11/12

Headings1/8

Technical17/25

E-E-A-T2/7

Images2/7

Links5/5

URL5/5

Social3/5

Freshness0/4

Mobile4/4

Indexability3/3

zkoss.orgzkoss.org

Leading Enterprise Java Web Framework | ZK

ZK is the leading open source Ajax + Mobile Java Web framework integrating jQuery, Spring, JPA, Hibernate, JavaEE, Grails, Scala and many more.

Title Length42 chars

Recommended: 50-60 chars (~262px / 580px)

Description Length143 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag — every page should have exactly one H1

7 issues found

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Crawlability

Sitemap

robots.txt

6 rules

Local SEO

Local Search Readiness

15/100

Poor

4 13

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

D43/100

Bot Access

20/25

Machine Read.

7/25

Schema Data

7/25

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:9%

Words:957

Token eff.:Optimal

Sections/1K:13.6

Structured Data

2 JSON-LD

Organization×1.1WebSiteSearchAction

sameAs entity links

Citation Readiness

Opening Summary15w

Descriptive Headingsavg 2w

Canonical URL

Open Graph3/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (12)

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.

57/100

Passed

Critical

Warnings

Images & Alt Text

15/20

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

5/15

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

7/15

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.

4 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.

46/100

153 mg

CO₂e / view

1.5 MB

Page Weight

60%

Cleaner Than

New Visitor

174 mg

Returning (cached)

87 mg

Annual (10K/mo)

18.3 kg

Emission Segments

Data Center

8 mg

Network

45 mg

Device

100 mg

Resource Breakdown

JavaScript

90.2 KB

Images

1.3 MB

CSS

70.3 KB

Fonts

5.8 KB

HTML

11.0 KB

Other

13.1 KB

Green Hosting Verified

Cloudflare

GWF Verified

5 recommendations

•Carbon footprint recommendation preview...

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Security Score

81%Very Good

Interactive

HTTPS

WAF

75d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

10.05.2026

Valid Until

08.08.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

zkoss.org*.zkoss.org

SHA-256 Fingerprint

3A:2E:E6:82:73:33:28:0A:CD:52:70:0F:20:2C:A3:C0:01:15:15:D9...

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HTTP Headers

Developer Console

alt-svc

h3=":443"; ma=86400

cf-cache-status

DYNAMIC

cf-ray🇩🇪 Frankfurt

a0129643bd3d9162-FRA

content-encoding

📦 Gzip(gzip)

content-length

10990

content-security-policy

default-src 'self';connect-src 'self' *.cloudflare.com *.goo...

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (5)

alt3.aspmx.l.google.com

aspmx.l.google.com

alt1.aspmx.l.google.com

alt4.aspmx.l.google.com

+1 more

Domain Information

zkoss.org

Domain Age

19y 8m

Created

18.09.2006

Expires

18.09.2026

Last Updated

24.08.2025

Registrar

Cloudflare, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

GDPR Cookie Compliance

Cookie Consent Banner

GDPR Cookie Compliance

GDPR Indicators

Cookie consent banner detected

CMP: GDPR Cookie Compliance

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.

53/100

Mobile Friendly1 breakpoint

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, maximum-scale=2.0, minimum-scale=1.0

3 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Roboto

WCAG Partial

58/100

Readability

/30

21/30

22px · LH 1.50

Hierarchy

/20

7/20

WCAG

/25

14/25

1:1 min contrast

Performance

/25

16/25

1 font · 4 req

Heading Font

Roboto

Sans

Body Font

Roboto

Sans22px

Contrast Ratio

1:1

9 issues

Reading Comfort

~34 CPL

Narrow lines

28px

20px

22px

✅ Excellent readability: 22px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

⚠️ Hard to read: Flesch score 39/100. Simplify sentences for wider reach.

⚠️ Partial contrast: 9 elements below WCAG AA threshold (min 1.0:1).

❌ Missing H1: Every page should have exactly one H1 element for SEO and accessibility.

✅ Lean font stack: 1 font families keeps load times fast.

GGoogle FontsFlesch 39

Color Palette

8 unique colors

Light

#ffffff

Background· 69%

#00a2d0

Primary· 8.9%

#46b4b9

Secondary· 4.9%

#a6bdc3

Secondary· 4.8%

#cae6e9

Secondary· 3.1%

#2e6d7b

Secondary· 2.4%

#519aa5

Secondary· 1.1%

Business & Marketing Stack

2 Tools Detected

Advanced

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Advertising

Google AdsEnterprise

Ad platforms and retargeting pixels

Sponsored

Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(7)apis.google.com(2)googleads.g.doubleclick.net(1)googleadservices.com(1)zkoss.org(1)

Website Identity

ZK Framework

Organization

zkoss.org/

19 years old

Location detected: 🇨🇦 Canadavia ip

Cloudflare, Inc.📧 Google Workspaceen

Social Profiles

Facebook X (Twitter)GitHub

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Last analyzed: 25 May 2026 at 06:47

Historical Analysis & Change Tracking