nvic.org

https://nvic.org· First analyzed 30 Apr 2026· Updated 30 Apr 2026

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nvic.org

Mobile

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

172.67.73.147

Site Location

🇨🇦 Canadavia ip

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

gracie.ns.cloudflare.com.hugh.ns.cloudflare.com.

Performance

Core Web Vitals

Weight

First Contentful Paint

805 ms10%

Speed Index

1.0 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

20.7 MB

45 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Tailwind CSS

Infrastructure

Hosting

Cloudflare

CDN

Cloudflare

Technology Stack

7 Technologies Detected

Analytics

Libraries

CSS Frameworks

Icon Libraries

Tag Managers

CDN

SEO Analysis

C65/100

Meta Tags12/15

Content12/12

Headings3/8

Technical13/21

E-E-A-T3/7

Images1/7

Links5/5

URL5/5

Social4/5

Freshness0/4

Mobile4/4

Indexability3/3

nvic.orgnvic.org

Home | National Vaccine Information Center (NVIC)

The non-profit National Vaccine Information Center (NVIC) is an independent clearinghouse for information on diseases and vaccine science, policy, law and th...

Description truncated.

Title Length49 chars

Recommended: 50-60 chars (~294px / 580px)

Description Length523 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (32/36) — critical for accessibility and SEO

9 issues found

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Local SEO

Local Search Readiness

11/100

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

D47/100

Bot Access

20/25

Machine Read.

14/25

Schema Data

0/25

Citation

13/25

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

blockquotesnavheader/footer

Text ratio:9%

Words:921

Token eff.:Optimal

Sections/1K:11.9

Depth:3/5

Structured Data

Microdata

Citation Readiness

Opening Summary217w

Descriptive Headingsavg 6.5w

Canonical URL

Open Graph3/3

Twitter Card2/3

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.

84/100

Passed

Critical

Warnings

Images & Alt Text

10/20

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

Semantic Structure

20/20

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

13/15

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

ARIA & Roles

11/15

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.

37/100

2.14 g

CO₂e / view

20.7 MB

Page Weight

Cleaner Than

New Visitor

2.45 g

Returning (cached)

1.23 g

Annual (10K/mo)

257.2 kg

Emission Segments

Data Center

105 mg

Network

630 mg

Device

1.41 g

Resource Breakdown

JavaScript

219.1 KB

Images

20.4 MB

CSS

140.9 KB

HTML

11.8 KB

Green Hosting Verified

Cloudflare

GWF Verified

6 recommendations

•Carbon footprint recommendation preview...

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Security Score

41%Poor

Interactive

HTTPS

WAF

35d

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

Valid From

06.03.2026

Valid Until

04.06.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

nvic.org*.nvic.org

SHA-256 Fingerprint

D1:67:A7:20:32:58:7F:33:86:73:93:1C:FD:CE:93:4E:AD:3C:E8:F4...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🔵 1 Days(max-age=86400)

cf-cache-status

DYNAMIC

cf-ray🇺🇸 Dallas

9f487c997e3a5d06-DFW

content-encoding

⚡ Brotli(br)

content-type

text/html; charset=utf-8

date

Thu, 30 Apr 2026 18:07:34 GMT

Good Warning Issue

Email Infrastructure

Zoho Mail

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (3)

mx2.zoho.com

mx.zoho.com

mx3.zoho.com

Domain Information

nvic.org

Domain Age

22y 11m

Created

20.05.2003

Expires

20.05.2028

Last Updated

26.03.2025

Registrar

Network Solutions, LLC

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Cookie consent banner detected

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.

73/100

Mobile Friendly2 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...

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Typography & Readability

Georgia + Arial

WCAG Partial

77/100

Readability

/30

26/30

16px · LH 1.50

Hierarchy

/20

15/20

2.25x ratio · ✓ H1→H6

WCAG

/25

14/25

1.19:1 min contrast

Performance

/25

22/25

System fonts

Heading Font

Georgia

Serif36px

Body Font

Arial

Sans16px

Contrast Ratio

1.19:1

9 issues

Reading Comfort

~38 CPL

Narrow lines

36px

38px

28px

16px

✅ 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 44/100. Simplify sentences for wider reach.

⚠️ Partial contrast: 9 elements below WCAG AA threshold (min 1.2:1).

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

✅ Strong hierarchy: Headlines are 2.2x larger than body text.

Buy on MyFontsFlesch 44

Color Palette

8 unique colors

Light

#f3f3f1

Background· 48.199999999999996%

#426bba

Primary· 19.1%

#acbadf

Secondary· 16.099999999999998%

#bdaba2

Secondary· 6.1%

#d6c4bf

Secondary· 4.3%

#323862

Secondary· 2.2%

#6c80aa

Secondary· 2.2%

#9ca6b8

Secondary· 1.7%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

13 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(7)googletagmanager.com(2)google-analytics.com(1)cdnjs.cloudflare.com(1)static.cloudflareinsights.com(1)

Website Identity

nvic.org

22 years old

21525 Ridgetop Circle, Suite 100, Sterling, VA 20166

Location detected: 🇨🇦 Canadavia ip

Network Solutions, LLC📧 Zoho Mailen

Social Profiles

X (Twitter)Telegram

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Last analyzed: 30 Apr 2026 at 18:07

Historical Analysis & Change Tracking