clusterbusters.org

https://clusterbusters.org· First analyzed 15 May 2026· Updated 15 May 2026

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clusterbusters.org

Mobile

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Hosting Provider

DreamHost

dreamhost.com

IP Address

173.236.141.104

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Ashburn, United States

ASN

AS26347

Organization

DreamHost

Server

Apache

Nameservers

ns2.dreamhost.com.ns1.dreamhost.com.ns3.dreamhost.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

641 ms10%

Speed Index

833 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

3.1 MB

95 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPressv6.8.5

cms

Diviv4.27.6Custom

by Elegant Themes

View Theme

Technology Stack

25 Technologies Detected

Plugins

Events Calendar Pro Pressapps Knowledge Base Essential Grid Pdf Poster

Responsive Table For Divi

Pojo Accessibility

Breadcrumbs Divi Module

The Events Calendar Page Links To Trinity Audio

Analytics

Libraries

Other

Other

CSS Frameworks

Icon Libraries

Fonts

Email Marketing

Web Servers

SEO Analysis

B77/100

Meta Tags15/15

Content3/12

Headings8/8

Technical22/25

E-E-A-T2/7

Images3/7

Links5/5

URL5/5

Social4/5

Freshness4/4

Mobile3/4

Indexability3/3

clusterbusters.orgclusterbusters.org

Clusterbusters - The Cluster Headache Advocacy Group

We support research for better treatments and a cure while advocating to improve the lives of those struggling with cluster headaches.

Title Length52 chars

Recommended: 50-60 chars (~320px / 580px)

Description Length134 chars

Recommended: 120-160 chars

Issues (1)

• Very thin content (7 words). Search engines need substantial content for ranking.

5 issues found

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Crawlability

Sitemap

Type: index

12 URLs

12 sub-sitemaps

robots.txt

3 rules

Local SEO

Local Search Readiness

18/100

Poor

5 12

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

Sponsored

AI & LLM Readiness

D45/100

Bot Access

20/25

Machine Read.

7/25

Schema Data

8/25

Citation

10/25

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:1%

Words:505

Token eff.:Optimal

Structured Data

5 JSON-LD

Organization×1.1WebSiteBreadcrumbListSearchAction

sameAs entity links

Citation Readiness

Opening Summary

Descriptive Headings

Canonical URL

Open Graph3/3

Twitter Card1/3

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.

74/100

Passed

Critical

Warnings

Images & Alt Text

20/20

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

Semantic Structure

10/20

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

14/15

Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.

Keyboard & Focus

8/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

7/15

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.

45/100

320 mg

CO₂e / view

3.1 MB

Page Weight

30%

Cleaner Than

New Visitor

366 mg

Returning (cached)

183 mg

Annual (10K/mo)

38.4 kg

Emission Segments

Data Center

16 mg

Network

94 mg

Device

210 mg

Resource Breakdown

JavaScript

551.5 KB

Images

2.1 MB

CSS

319.1 KB

Fonts

87.8 KB

HTML

63.2 KB

Green Hosting Verified

DreamHost

Provider Match

6 recommendations

•Carbon footprint recommendation preview...

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Security Score

21%Critical

Interactive

HTTPS

No WAF

193d

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

18.11.2025

Valid Until

24.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

clusterbusters.orgwww.clusterbusters.org

SHA-256 Fingerprint

41:0D:F0:CA:80:74:D7:75:9A:C2:97:FD:3A:2C:23:7E:98:49:82:1E...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

cache-control

🟡 0s(max-age=0)

content-encoding

📦 Gzip(gzip)

content-length

64435

content-type

text/html; charset=UTF-8

date

Fri, 15 May 2026 00:54:54 GMT

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (7)

ASPMX2.GOOGLEMAIL.COM

ALT1.ASPMX.L.GOOGLE.COM

ASPMX.L.GOOGLE.COM

ASPMX4.GOOGLEMAIL.COM

+3 more

Domain Information

clusterbusters.org

Domain Age

20y 11m

Created

01.06.2005

Expires

01.06.2027

Last Updated

07.05.2026

Registrar

DreamHost, LLC

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

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.

56/100

Not Mobile Friendly84 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.

3 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Acme + Roboto

WCAG Partial

67/100

Readability

/30

15/30

14px · LH 1.80

Hierarchy

/20

15/20

2.29x ratio · ✓ H1→H6

WCAG

/25

19/25

1:1 min contrast

Performance

/25

18/25

System fonts

Heading Font

Acme

Sans32px

Body Font

Roboto

Sans14px

Contrast Ratio

1:1

2 issues

Reading Comfort

~36 CPL

Narrow lines

32px

51px

24px

19px

14px

⚠️ Small text: 14px may strain on mobile. Use ≥16px for WCAG compliance.

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

⚠️ Partial contrast: 2 elements below WCAG AA threshold (min 1.0:1).

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

✅ Strong hierarchy: Headlines are 2.3x larger than body text.

✅ Modern fluid typography: clamp() with rem units ensures zoom accessibility (WCAG 1.4.4).

GGoogle Fonts Buy on MyFontsFluid Type (rem)Flesch 39

Color Palette

9 unique colors

Light

#ffffff

Background· 43.800000000000004%

#0d4c93

Primary· 13%

#81a1c3

Secondary· 9.7%

#3f70a7

Secondary· 6.8%

#5984b4

Secondary· 6.5%

#5b6474

Secondary· 6%

#215a9b

Accent· 5.6%

#afc0d1

Secondary· 4.5%

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

Ad platforms and retargeting pixels

Social Media

Facebook SDKFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

clusterbusters.org(9)connect.facebook.net(4)googletagmanager.com(2)ajax.googleapis.com(1)gstatic.com(1)

Website Identity

Clusterbusters

Organization

We support research for better treatments and a cure while advocating to improve the lives of those struggling with cluster headaches.

clusterbusters.org/

20 years old

Location detected: 🇺🇸 United Statesvia ip

DreamHost, LLC📧 Google Workspaceen-US

Social Profiles

Facebook X (Twitter)Instagram YouTube

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Last analyzed: 15 May 2026 at 00:55

Historical Analysis & Change Tracking