StackOptic
Back to Search
pubmed.gov favicon

pubmed.gov

https://pubmed.gov· First analyzed 01 May 2026· Updated 01 May 2026
Export
pubmed.gov
Desktop screenshot of pubmed.gov
Mobile screenshot of pubmed.gov
Mobile

Sponsored

Hosting Provider

National Library of Medicine

IP Address

130.14.29.109

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Washington, United States

ASN

AS70

Organization

National Library of Medicine

Server

Nginx

Nameservers

ns-148.awsdns-18.com.ns-1865.awsdns-41.co.uk.ns-591.awsdns-09.net.ns-1171.awsdns-18.org.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
684 ms10%
Speed Index
889 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
117 KB
35 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
National Library of Medicine

Technology Stack

6 Technologies Detected

Analytics

2
Google Analytics
Google Analytics 4

CSS Frameworks

1
Tailwind CSS

Icon Libraries

1
Font Awesome

Tag Managers

1
Google Tag Manager

Web Servers

1
Nginx

SEO Analysis

B72/100
20
5
0
Meta Tags7/15
Content11/12
Headings8/8
Technical17/21
E-E-A-T3/7
Images4/7
Links5/5
URL5/5
Social5/5
Freshness0/4
Mobile4/4
Indexability3/3
P
pubmed.govpubmed.gov

PubMed

PubMed® comprises more than 40 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links...

Description truncated.
Title Length6 chars

Recommended: 50-60 chars (~40px / 580px)

Description Length223 chars

Recommended: 120-160 chars

Issues (0)

    5 issues found

    Upgrade to view details

    Local SEO

    Local Search Readiness

    13/100
    Poor
    4 11 2

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

    Sponsored

    AI & LLM Readiness

    D48/100
    Bot Access
    20/25
    Machine Read.
    12/25
    Schema Data
    0/25
    Citation
    16/25

    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
    code blocksnavheader/footer
    Text ratio:7%
    Words:565
    Token eff.:Optimal
    Sections/1K:19.5
    Depth:3/5

    Structured Data

    Microdata

    Citation Readiness

    Opening Summary26w
    Descriptive Headingsavg 4.4w
    Canonical URL
    Open Graph3/3
    Twitter Card3/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (9)
    AI readiness recommendation preview...
    Upgrade to view recommendations

    Sponsored

    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+
    90/100
    16
    Passed
    1
    Critical
    1
    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
    15/15
    Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
    ARIA & Roles
    8/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

    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.
    55/100
    A+
    15 mg
    CO₂e / view
    117.2 KB
    Page Weight
    95%
    Cleaner Than
    New Visitor
    17 mg
    vs
    Returning (cached)
    8 mg
    Annual (10K/mo)
    1.7 kg
    Emission Segments
    Data Center
    3 mg
    Network
    4 mg
    Device
    8 mg
    Resource Breakdown
    JavaScript
    98.3 KB
    Images
    686 B
    HTML
    11.2 KB
    Other
    7.0 KB
    Green Hosting Not Verified
    National Library of Medicine
    5 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    C

    Security Score

    64%Fair
    Interactive

    HTTPS

    No WAF

    147d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    GoDaddy.com, Inc.

    Key Algorithm

    RSA (2048 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2

    Valid From

    12.03.2026

    Valid Until

    26.09.2026

    OCSP Stapling

    Enabled

    Subject Alternative Names (2)

    pubmed.ncbi.nlm.nih.govwww.pubmed.ncbi.nlm.nih.gov

    SHA-256 Fingerprint

    BA:70:90:17:64:D9:71:5A:D8:38:AB:F8:2C:22:F8:69:19:DA:31:A3...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    alt-svc
    clear
    cache-control
    🟣 Private(private)
    content-encoding
    📦 Gzip(gzip)
    content-type
    text/html; charset=utf-8
    cross-origin-opener-policy
    same-origin
    date
    Fri, 01 May 2026 17:14:11 GMT
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    50

    SPF
    DKIM
    DMARC

    DMARC Policy

    Reject (Strictest)

    Domain Information

    pubmed.gov

    Domain Age
    27y 11m

    Created

    03.06.1998

    Expires

    18.08.2026

    Last Updated

    23.08.2025

    Registrar

    get.gov

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookie Consent Banner
    Privacy Policy
    Terms of Service

    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
    69/100
    Mobile Friendly5 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=1.0
    2 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Merriweather + BlinkMacSystemFont

    WCAG Partial
    76/100
    Readability
    /30
    22/30

    14px · LH 1.57

    Hierarchy
    /20
    18/20

    2.86x ratio · ✓ H1→H6

    WCAG
    /25
    16/25

    1:1 min contrast

    Performance
    /25
    20/25

    System fonts

    Heading Font

    Merriweather

    Serif40px

    Body Font

    BlinkMacSystemFont

    Sans14px

    Contrast Ratio

    1:1

    1 issue

    Reading Comfort

    ~42 CPL

    Narrow lines
    40px
    h1
    20px
    h2
    16px
    h3
    17px
    h4
    14px
    p

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

    ✅ Optimal line spacing: 1.57 ratio (ideal range 1.4–1.6).

    ⚠️ Hard to read: Flesch score 40/100. Simplify sentences for wider reach.

    ⚠️ Partial contrast: 1 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 2.9x larger than body text.

    Buy on MyFontsFlesch 40

    Color Palette

    8 unique colors
    Light
    #ffffff
    Background· 27.3%
    #112f53
    Accent· 32.599999999999994%
    #20558a
    Primary· 0%
    #055f9f
    Accent· 8.4%
    #0a4b7e
    Accent· 7.2%
    #e1e8eb
    Secondary· 4.8%
    #397ba4
    Secondary· 2.9%

    Business & Marketing Stack

    3 Tools Detected

    Advanced

    Behavior Analytics

    2
    Google Tag ManagerFree
    Google AnalyticsFree

    User behavior and product analytics

    Social Media

    1
    Twitter/X WidgetsFree

    Social widgets and sharing tools

    2

    Categories

    3

    Total Tools

    0

    Enterprise

    0

    Mid-Market

    Assessment: Well-developed marketing technology stack

    Sponsored

    Scripts & Styles

    20 Resources

    15
    Scripts
    5
    Styles
    2
    Async
    2
    Defer

    Top Script Sources

    siteintercept.qualtrics.com(5)cdn.ncbi.nlm.nih.gov(4)googletagmanager.com(3)dap.digitalgov.gov(2)zndikywqsjiuwn0q5-nlmenterprise.siteintercept.qualtrics.com(1)

    Website Identity

    pubmed.gov

    27 years old
    Location detected: 🇺🇸 United Statesvia ip
    get.goven

    Sponsored

    Last analyzed: 01 May 2026 at 17:14

    Historical Analysis & Change Tracking