heartrhythmjournal.com

https://heartrhythmjournal.com· First analyzed 07 May 2026· Updated 07 May 2026

Export

Mobile

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Hosting Provider

Cloudflare

cloudflare.com

IP Address

162.159.140.114

Site Location

🇨🇦 Canadavia ip

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

ns2.reedelsevier.com.ns3.reedelsevier.com.ns1.reedelsevier.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

314 ms10%

Speed Index

408 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

691 KB

82 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Cloudflare

CDN

Cloudflare

Technology Stack

5 Technologies Detected

CSS Frameworks

Fonts

Advertising

CDN

Customer Support

SEO Analysis

D55/100

Meta Tags4/15

Content10/12

Headings3/8

Technical18/25

E-E-A-T0/7

Images3/7

Links5/5

URL5/5

Social1/5

Freshness0/4

Mobile3/4

Indexability3/3

heartrhythmjournal.comheartrhythmjournal.com

Home Page: Heart Rhythm

No description available for this page.

Title Length23 chars

Recommended: 50-60 chars (~146px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

• Missing meta description — important for click-through rates in SERPs
• Missing H1 tag — every page should have exactly one H1

13 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

70 rules

Sitemap reference found

Local SEO

Local Search Readiness

7/100

Poor

2 14 2

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

Sponsored

AI & LLM Readiness

F33/100

Bot Access

12/25

Machine Read.

7/25

Schema Data

3/25

Citation

11/25

AI Bot Access

5/14 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:4%

Words:1,471

Token eff.:Optimal

Sections/1K:0.7

Structured Data

1 JSON-LD

WebSiteSearchAction

Citation Readiness

Opening Summary170w

Descriptive Headingsavg 5.8w

Canonical URL

Open Graph0/3

Twitter Card1/3

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.

86/100

Passed

Critical

Warnings

Images & Alt Text

20/20

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

Semantic Structure

17/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

10/15

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

15/15

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.

2 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.

69/100

70 mg

CO₂e / view

691.3 KB

Page Weight

80%

Cleaner Than

New Visitor

80 mg

Returning (cached)

40 mg

Annual (10K/mo)

8.4 kg

Emission Segments

Data Center

3 mg

Network

21 mg

Device

46 mg

Resource Breakdown

JavaScript

698 B

Images

605.3 KB

CSS

900 B

HTML

52.6 KB

Other

31.8 KB

Green Hosting Verified

Cloudflare

GWF Verified

4 recommendations

•Carbon footprint recommendation preview...

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Security Score

25%Critical

Critical / Transactional

HTTPS

WAF

48d

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

26.03.2026

Valid Until

24.06.2026

OCSP Stapling

Enabled

Subject Alternative Names (1)

www.heartrhythmjournal.com

SHA-256 Fingerprint

A2:D5:46:15:CC:A0:82:2E:95:E4:66:A8:F8:5C:63:8B:85:7F:CB:9E...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

alt-svc

h3=":443"; ma=86400

cache-control

🔴 No Cache(no-cache)

cf-cache-status

DYNAMIC

cf-ray🇺🇸 Washington DC

9f7e36b748f2b135-IAD

content-encoding

⚡ Brotli(br)

content-security-policy-report-only

script-src data: https: 'unsafe-inline' 'unsafe-eval' 'stric...

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

Domain Information

heartrhythmjournal.com

Domain Age

22y 3m

Created

21.01.2004

Expires

21.01.2027

Last Updated

22.01.2026

Registrar

SafeNames Ltd.

DNSSEC

Not Enabled

Privacy & Compliance

OneTrust

Cookie Consent Banner

OneTrust

GDPR Indicators

Cookie consent banner detected

CMP: OneTrust

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.

70/100

Mobile Friendly25 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.

Viewport

width=device-width,initial-scale=1

2 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Elsevier Sans

WCAG Partial

75/100

Readability

/30

26/30

16px · LH 1.40

Hierarchy

/20

16/20

2x ratio · ✓ H1→H6

WCAG

/25

17/25

1:1 min contrast

Performance

/25

16/25

1 font · 14 req

Heading Font

Elsevier Sans

Sans32px

Body Font

Elsevier Sans

Sans16px

Contrast Ratio

1:1

5 issues

Reading Comfort

~38 CPL

Narrow lines

32px

26px

22px

16px

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

✅ Optimal line spacing: 1.40 ratio (ideal range 1.4–1.6).

⚠️ Partial contrast: 5 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 2.0x larger than body text.

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

GGoogle Fonts Buy on MyFonts

Color Palette

9 unique colors

4.29:1 AA Large Light

#ffffff

Background· 40%

#867585

Other· 5.1%

#101a3e

Accent· 18.8%

#b02327

Primary· 11.3%

#050a1a

Accent· 5.3%

#c5c9d0

Border· 4.5%

#541426

Accent· 1.5%

#5a283e

Secondary· 1.4%

Business & Marketing Stack

2 Tools Detected

Advanced

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

OneTrustEnterprise

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

25 Resources

Scripts

Styles

Async

Defer

Top Script Sources

heartrhythmjournal.com(9)local(2)securepubads.g.doubleclick.net(2)static.cloudflareinsights.com(2)bam.nr-data.net(1)

Website Identity

heartrhythmjournal.com

22 years old

Location detected: 🇨🇦 Canadavia ip

SafeNames Ltd.en

Social Profiles

Facebook X (Twitter)YouTube

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Last analyzed: 07 May 2026 at 06:38

Historical Analysis & Change Tracking