cfd-online.com

https://cfd-online.com· First analyzed 26 Apr 2026· Updated 26 Apr 2026

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cfd-online.com

Mobile

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

104.26.12.119

Site Location

🇨🇦 Canadavia ip

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

zainab.ns.cloudflare.com.matteo.ns.cloudflare.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

200 ms10%

Speed Index

260 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

63 KB

18 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Cloudflare

CDN

Cloudflare

Technology Stack

2 Technologies Detected

Analytics

Google Analytics

CDN

Cloudflare

SEO Analysis

D49/100

Meta Tags9/15

Content11/12

Headings0/8

Technical10/25

E-E-A-T0/7

Images2/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

cfd-online.comcfd-online.com

CFD Online

An online center for Computational Fluid Dynamics. This is the largest CFD site on the net with services like discussion forums, jobs, links and a wiki.

Title Length10 chars

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

Description Length152 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)

10 issues found

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Crawlability

Sitemap

robots.txt

69 rules

Local SEO

Local Search Readiness

6/100

Poor

2 13 2

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

Sponsored

AI & LLM Readiness

F30/100

Bot Access

15/25

Machine Read.

8/25

Schema Data

0/25

Citation

7/25

AI Bot Access

6/14 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:13%

Words:677

Token eff.:Optimal

Structured Data

No Schema

Citation Readiness

Opening Summary

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 (10)

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.

56/100

Passed

Critical

Warnings

Images & Alt Text

10/20

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

Semantic Structure

6/20

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.

71/100

A+

6 mg

CO₂e / view

63.4 KB

Page Weight

95%

Cleaner Than

New Visitor

7 mg

Returning (cached)

4 mg

Annual (10K/mo)

768 g

Emission Segments

Data Center

<0.001 g

Network

2 mg

Device

4 mg

Resource Breakdown

JavaScript

1022 B

Images

55.0 KB

HTML

7.4 KB

Green Hosting Verified

Cloudflare

GWF Verified

3 recommendations

•Carbon footprint recommendation preview...

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Security Score

71%Good

Static / Informational

HTTPS

WAF

73d

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

Valid From

10.04.2026

Valid Until

09.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

cfd-online.com*.cfd-online.com

SHA-256 Fingerprint

D3:DE:4D:CF:2D:8D:5D:9E:02:DF:50:78:81:12:5D:19:09:E2:0E:13...

Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cf-cache-status

DYNAMIC

cf-ray🇮🇹 Milan

9f24f7bdb8c4baee-MXP

content-encoding

⚡ Brotli(br)

content-type

text/html

date

Sun, 26 Apr 2026 10:40:10 GMT

nel

{"report_to":"cf-nel","success_fraction":0.0,"max_age":60480...

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

mail.cfd-online.com

Domain Information

cfd-online.com

Domain Age

27y 11m

Created

20.05.1998

Expires

19.05.2028

Last Updated

10.02.2026

Registrar

GoDaddy.com, LLC

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

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.

31/100

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

Times New Roman

WCAG Partial

61/100

Readability

/30

19/30

16px · LH --

Hierarchy

/20

8/20

WCAG

/25

14/25

1.19:1 min contrast

Performance

/25

20/25

System fonts

Heading Font

Times New Roman

Body Font

Times New Roman

Serif16px

Contrast Ratio

1.19:1

23 issues

Reading Comfort

Single Family

right aligned

16px

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

❌ Very complex text: Flesch score 0/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 23 elements below WCAG AA threshold (min 1.2:1).

✅ System fonts: Zero font loading delay — best possible LCP impact.

Buy on MyFontsFlesch 0

Color Palette

7 unique colors

2.09:1 Fail Light

#ffffff

Background· 70.50000000000001%

#bab1b4

Other· 4.5%

#555b82

Primary· 5.7%

#1e2869

Accent· 3.8%

#7d8ba4

Secondary· 3.7%

#dde6e3

Secondary· 2%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

4 Resources

Scripts

Styles

Async

Defer

Top Script Sources

cfd-online.com(2)local(1)static.cloudflareinsights.com(1)

Website Identity

cfd-online.com

27 years old

Location detected: 🇨🇦 Canadavia ip

GoDaddy.com, LLCen-US

Social Profiles

Facebook Bluesky

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Last analyzed: 26 Apr 2026 at 10:40

Historical Analysis & Change Tracking