jfree.org

https://jfree.org· First analyzed 01 May 2026· Updated 01 May 2026

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jfree.org

Mobile

Sponsored

Hosting Provider

Positive Infrastructure

IP Address

185.27.20.77

Site Location

🇬🇧 United Kingdomvia ip

Server Location

🇬🇧 London, United Kingdom

ASN

AS21260

Organization

Positive Infrastructure

Server

Nginx

Nameservers

dns1.positive-internet.com.dns0.positive-internet.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

379 ms10%

Speed Index

493 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

21 KB

5 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Positive Infrastructure

Technology Stack

1 Technologies Detected

Web Servers

Nginxv1.18.0

SEO Analysis

D42/100

Meta Tags5/15

Content9/12

Headings3/8

Technical4/21

E-E-A-T0/7

Images4/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

jfree.orgjfree.org

www.jfree.org

The official home page for JFree.

Title Length13 chars

Recommended: 50-60 chars (~84px / 580px)

Description Length33 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag — every page should have exactly one H1
• Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

14 issues found

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Local SEO

Local Search Readiness

0/100

Poor

15 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

F34/100

Bot Access

20/25

Machine Read.

10/25

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:42%

Words:312

Token eff.:Optimal

Sections/1K:22.4

Structured Data

No Schema

Citation Readiness

Opening Summary21w

Descriptive Headingsavg 1.6w

Canonical URL

Open Graph0/3

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.

64/100

Passed

Critical

Warnings

Images & Alt Text

20/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

4/20

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.

3 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.

76/100

A+

2 mg

CO₂e / view

21.3 KB

Page Weight

95%

Cleaner Than

New Visitor

3 mg

Returning (cached)

1 mg

Annual (10K/mo)

264 g

Emission Segments

Data Center

<0.001 g

Network

<0.001 g

Device

1 mg

Resource Breakdown

CSS

19.3 KB

HTML

2.0 KB

Green Hosting Verified

The Positive Internet Company Ltd.

GWF Verified

2 recommendations

•Carbon footprint recommendation preview...

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Security Score

76%Good

Static / Informational

HTTPS

No WAF

279d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Sectigo Limited

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

05.01.2026

Valid Until

04.02.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

www.jfree.orgjfree.org

SHA-256 Fingerprint

16:DE:F2:8A:29:D2:B2:A0:40:BB:EE:62:60:46:40:FB:D6:C2:50:20...

Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

content-encoding

📦 Gzip(gzip)

content-length

1735

content-security-policy

upgrade-insecure-requests

content-type

text/html

date

Fri, 01 May 2026 15:33:31 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (2)

bludger.positive-internet.com

pop3.positive-internet.com

Domain Information

jfree.org

Domain Age

23y 10m

Created

17.06.2002

Expires

17.06.2026

Last Updated

01.08.2024

Registrar

Tucows Domains Inc.

DNSSEC

Not Enabled

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.

32/100

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...

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Typography & Readability

Verdana

WCAG Partial

55/100

Readability

/30

16/30

11px · LH 1.56

Hierarchy

/20

8/20

WCAG

/25

17/25

2.3:1 min contrast

Performance

/25

14/25

1 font

Heading Font

Verdana

Sans

Body Font

Verdana

Sans11px

Contrast Ratio

2.3:1

20 issues

Reading Comfort

~60 CPL

Optimal (45–75)

19px

12px

11px

❌ Critical: 11px body text is too small. Minimum 14px, recommend 16px+.

✅ Optimal line spacing: 1.56 ratio (ideal range 1.4–1.6).

✅ Optimal line length: ~60 chars/line (ideal 45–75 CPL).

⚠️ Partial contrast: 20 elements below WCAG AA threshold (min 2.3:1).

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

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

Buy on MyFontsFlesch 65

Color Palette

5 unique colors

Light

#e9eaec

Background· 45.8%

#5180a9

Primary· 9.4%

#a9b8be

Secondary· 5.1%

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Scripts & Styles

1 Resources

Scripts

Styles

Async

Defer

Top Script Sources

Website Identity

jfree.org

23 years old

Location detected: 🇬🇧 United Kingdomvia ip

Tucows Domains Inc.

Social Profiles

X (Twitter)GitHub

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Last analyzed: 01 May 2026 at 15:33

Historical Analysis & Change Tracking