physionet.org

https://physionet.org· First analyzed 03 May 2026· Updated 03 May 2026

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physionet.org

Mobile

Sponsored

Hosting Provider

Massachusetts Institute of Technology

IP Address

18.13.52.205

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Cambridge, United States

ASN

AS3

Organization

Massachusetts Institute of Technology

Server

Nginx

Nameservers

ns-132-b.gandi.net.ns-41-a.gandi.net.ns-6-c.gandi.net.

Performance

Core Web Vitals

Weight

First Contentful Paint

2.9 s10%

Speed Index

3.8 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

1.3 MB

34 requests

Image Optimization

WebP

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Bootstrap

Infrastructure

Hosting

Massachusetts Institute of Technology

Technology Stack

8 Technologies Detected

CSS Frameworks

Analytics

Libraries

UI Components

Icon Libraries

Web Servers

SEO Analysis

D55/100

Meta Tags4/15

Content10/12

Headings7/8

Technical13/25

E-E-A-T3/7

Images1/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

physionet.orgphysionet.org

PhysioNet

No description available for this page.

Title Length9 chars

Recommended: 50-60 chars (~53px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

• Missing meta description — important for click-through rates in SERPs
• Most images missing alt text (10/12) — critical for accessibility and SEO

11 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

1 rules

Allows all crawlers

Local SEO

Local Search Readiness

3/100

Poor

1 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

D44/100

Bot Access

20/25

Machine Read.

12/25

Schema Data

0/25

Citation

12/25

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

nav

Text ratio:37%

Words:2,143

Token eff.:Optimal

Sections/1K:10.7

Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary43w

Descriptive Headingsavg 6.4w

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (8)

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.

73/100

Passed

Critical

Warnings

Images & Alt Text

15/20

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

Semantic Structure

15/20

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

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.

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.

39/100

160 mg

CO₂e / view

1.3 MB

Page Weight

70%

Cleaner Than

New Visitor

183 mg

Returning (cached)

92 mg

Annual (10K/mo)

19.2 kg

Emission Segments

Data Center

36 mg

Network

38 mg

Device

86 mg

Resource Breakdown

JavaScript

308.4 KB

Images

54.4 KB

CSS

920.9 KB

HTML

11.5 KB

Green Hosting Not Verified

Massachusetts Institute of Technology

4 recommendations

•Carbon footprint recommendation preview...

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Security Score

64%Fair

Interactive

HTTPS

No WAF

81d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.2

HTTP Protocol

HTTP/2

Valid From

24.04.2026

Valid Until

23.07.2026

Subject Alternative Names (4)

alpha.physionet.orgmail.physionet.orgphysionet.orgwww.physionet.org

SHA-256 Fingerprint

98:20:71:AB:C1:26:61:5D:62:2F:A1:4B:8E:69:09:C0:AD:18:59:A7...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=utf-8

cross-origin-opener-policy

same-origin

date

Sun, 03 May 2026 10:05:03 GMT

referrer-policy

same-origin

server

nginx/1.22.1

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

mail.physionet.org

Domain Information

physionet.org

Domain Age

26y 11m

Created

07.06.1999

Expires

07.06.2027

Last Updated

27.04.2026

Registrar

Gandi SAS

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.

62/100

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=1.0

2 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Inter

WCAG AA

73/100

Readability

/30

22/30

14px · LH 1.50

Hierarchy

/20

16/20

2.29x ratio

WCAG

/25

17/25

4.99:1 min contrast

Performance

/25

18/25

1 font · 5 req

Heading Font

Inter

Sans32px

Body Font

Inter

Sans14px

Contrast Ratio

4.99:1

WCAG AA (≥4.5:1)

Reading Comfort

~42 CPL

Narrow lines

32px

28px

14px

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

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

❌ Very complex text: Flesch score 30/100. Consider shorter sentences and simpler words.

✅ WCAG AA contrast: All text meets 4.5:1 ratio (min 5.0:1).

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

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

Buy on MyFontsFlesch 30

Color Palette

5 unique colors

Light

#ffffff

Background· 62.40000000000001%

#efe5e1

Primary· 22.099999999999998%

#c6babd

Secondary· 5.6%

#e2d7d3

Secondary· 5.3%

#755460

Secondary· 4.9%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

18 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(6)googletagmanager.com(2)google-analytics.com(1)

Website Identity

physionet.org

26 years old

Location detected: 🇺🇸 United Statesvia ip

Gandi SASen

Social Profiles

LinkedIn GitHub

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Last analyzed: 03 May 2026 at 10:05

Historical Analysis & Change Tracking