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cfs.energy

https://cfs.energy· First analyzed 07 May 2026· Updated 07 May 2026
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cfs.energy
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Hosting Provider

Amazon Web Services (AWS)
aws.amazon.com

IP Address

18.165.122.22

Site Location

🇮🇪 Irelandvia ip

Server Location

🇮🇪 Dublin, Ireland

ASN

AS16509

Organization

AWS CloudFront (GLOBAL)

CDN

CloudFront

Nameservers

ns-1304.awsdns-35.org.ns-1799.awsdns-32.co.uk.ns-260.awsdns-32.com.ns-788.awsdns-34.net.

Performance

99

Core Web Vitals

Weight

First Contentful Paint
834 ms10%
Speed Index
1.1 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
1.5 MB
64 requests

Image Optimization

Lazy LoadResponsive
0–49
50–89
90–100

Architecture Stack

JAMstack
🔀 Hybrid
Decoupled
Frontend
Framework
Next.js
API
Data Source
Headless CMS
Prismic
Infrastructure
Platform
AWS CloudFront
CDN
CloudFront

Detected API Sources

https://static.cdn.prismic.io/...https://static.cdn.prismic.io/...

Technology Stack

4 Technologies Detected

Meta Frameworks

1
Next.js

CSS Frameworks

1
Tailwind CSS

Email Marketing

1
Mailchimp

Analytics

1
FullStory

SEO Analysis

C65/100
19
9
1
Meta Tags8/15
Content8/12
Headings7/8
Technical15/25
E-E-A-T3/7
Images3/7
Links5/5
URL5/5
Social4/5
Freshness0/4
Mobile4/4
Indexability3/3
C
cfs.energycfs.energy

Home | Commonwealth Fusion Systems

The world's largest and leading commercial fusion energy company

Title Length34 chars

Recommended: 50-60 chars (~218px / 580px)

Description Length64 chars

Recommended: 120-160 chars

Issues (1)

  • • Most images missing alt text (5/7) — critical for accessibility and SEO

10 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

72 URLs

robots.txt

21 rules

Sitemap reference found

Local SEO

Local Search Readiness

10/100
Poor
3 12 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

D43/100
Bot Access
19/25
Machine Read.
11/25
Schema Data
0/25
Citation
13/25

AI Bot Access

10/14 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
blockquotesnav
Text ratio:3%
Words:376
Token eff.:Optimal
Sections/1K:13.3
Depth:2/5

Structured Data

No Schema

Citation Readiness

Opening Summary41w
Descriptive Headingsavg 9.4w
Canonical URL
Open Graph2/3
Twitter Card3/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (9)
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.
A
85/100
13
Passed
2
Critical
0
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
17/20
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
9/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
1 recommendation
  • •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.
57/100
C
155 mg
CO₂e / view
1.5 MB
Page Weight
60%
Cleaner Than
New Visitor
177 mg
vs
Returning (cached)
89 mg
Annual (10K/mo)
18.6 kg
Emission Segments
Data Center
8 mg
Network
46 mg
Device
102 mg
Resource Breakdown
JavaScript
237.7 KB
Images
463.3 KB
CSS
544.3 KB
Fonts
227.5 KB
HTML
15.6 KB
Other
48.3 KB
Green Hosting Verified
Amazon Web Services (AWS)
Provider Match
4 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
B

Security Score

71%Good
Static / Informational

HTTPS

No WAF

189d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Amazon

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

29.04.2026

Valid Until

12.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.cfs.energycfs.energy

SHA-256 Fingerprint

B2:27:C3:B8:39:A1:8C:3D:DA:D0:89:BA:14:CF:6E:EE:BC:82:44:C0...

Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

alt-svc
h3=":443"; ma=86400
cache-control
🟡 0s(public, max-age=0, must-revalidate)
content-encoding
📦 Gzip(gzip)
content-type
text/html; charset=utf-8
date
Thu, 07 May 2026 13:56:15 GMT
etag
"peqe5wvim723t6"
Good Warning Issue

Email Infrastructure

Mimecast

Score

95

SPF
DKIM
DMARC

DMARC Policy

Reject (Strictest)

MX Records (2)

us-smtp-inbound-2.mimecast.com
us-smtp-inbound-1.mimecast.com

Domain Information

cfs.energy

Domain Age
8y 6m

Created

06.11.2017

Expires

06.11.2026

Last Updated

29.04.2026

Registrar

Amazon Registrar, Inc.

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected
Privacy policy page linked

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.
C
67/100
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
1 recommendation
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

nbInternational

WCAG Partial
65/100
Readability
/30
23/30

16px · LH 1.50

Hierarchy
/20
13/20

4.38x ratio

WCAG
/25
13/25

1:1 min contrast

Performance
/25
16/25

2 fonts · 8 req

Heading Font

nbInternational

Sans70px

Body Font

nbInternational

Sans16px

Contrast Ratio

1:1

21 issues

Reading Comfort

~37 CPL

Narrow lines
70px
h1
70px
h2
32px
h3
16px
p

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

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

⚠️ Hard to read: Flesch score 32/100. Simplify sentences for wider reach.

⚠️ Partial contrast: 21 elements below WCAG AA threshold (min 1.0:1).

⚠️ Minor heading issue: 1 level skip(s) detected. Maintain sequential order for screen readers.

✅ Strong hierarchy: Headlines are 4.4x larger than body text.

Buy on MyFontsFlesch 32

Color Palette

10 unique colors
7.58:1 AAA Dark
#33332f
Text· 17.9%
#cac8c2
Other· 4.6%
#060604
Primary· 6.2%

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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Scripts & Styles

20 Resources

16
Scripts
4
Styles
12
Async
0
Defer

Top Script Sources

local(15)static.cdn.prismic.io(1)

Website Identity

cfs.energy

press@cfs.energy
8 years old

Commonwealth Fusion Systems117 Hospital RdDevens, MA 01434Copyright 2026 Commonwealth Fusion SystemsAll rights reserved.

Location detected: 🇮🇪 Irelandvia ip
Amazon Registrar, Inc.📧 Mimecasten

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Last analyzed: 07 May 2026 at 13:56

Historical Analysis & Change Tracking