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jeffhuang.com

https://jeffhuang.com· First analyzed 14 May 2026· Updated 14 May 2026
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jeffhuang.com
Desktop screenshot of jeffhuang.com
Mobile screenshot of jeffhuang.com
Mobile

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Hosting Provider

Vultr
vultr.com

IP Address

140.82.1.67

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Piscataway, United States

ASN

AS20473

Organization

Vultr Holdings, LLC

Server

Apache

Nameservers

dns2.registrar-servers.com.dns1.registrar-servers.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
603 ms10%
Speed Index
784 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
179 KB
4 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Frontend
Styling
Bootstrap
Infrastructure
Hosting
Vultr

Technology Stack

3 Technologies Detected

CSS Frameworks

2
Bootstrap
Tailwind CSS

Web Servers

1
Apachev2.4.52

SEO Analysis

D59/100
15
8
1
Meta Tags13/15
Content12/12
Headings3/8
Technical10/21
E-E-A-T0/7
Images4/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile4/4
Indexability3/3
J
jeffhuang.comjeffhuang.com

Jeff Huang · Computer Science at Brown University

Jeff Huang, Associate Professor at Brown University in Computer Science, working in Human-Computer Interaction.

Title Length49 chars

Recommended: 50-60 chars (~302px / 580px)

Description Length111 chars

Recommended: 120-160 chars

Issues (1)

  • • Missing H1 tag — every page should have exactly one H1

9 issues found

Upgrade to view details

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

F39/100
Bot Access
20/25
Machine Read.
13/25
Schema Data
0/25
Citation
6/25

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:39%
Words:2,286
Token eff.:Optimal
Sections/1K:3.1
Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary10w
Descriptive Headingsavg 3.4w
Canonical URL
Open Graph0/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (10)
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.
B
73/100
9
Passed
3
Critical
0
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
13/20
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
9/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
1/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
2 recommendations
  • •Accessibility recommendation preview...
Upgrade to view recommendations

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.
63/100
A+
22 mg
CO₂e / view
178.9 KB
Page Weight
95%
Cleaner Than
New Visitor
25 mg
vs
Returning (cached)
13 mg
Annual (10K/mo)
2.7 kg
Emission Segments
Data Center
5 mg
Network
5 mg
Device
12 mg
Resource Breakdown
Images
137.7 KB
CSS
30.8 KB
HTML
10.4 KB
Green Hosting Not Verified
Vultr
3 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
B

Security Score

71%Good
Static / Informational

HTTPS

No WAF

82d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

06.05.2026

Valid Until

04.08.2026

Subject Alternative Names (2)

jeffhuang.comwww.jeffhuang.com

SHA-256 Fingerprint

C5:18:5F:1E:9D:90:28:BF:33:B9:0E:F2:9C:99:FE:5D:1C:CA:8A:3A...

Recommendations

Security recommendation preview

Upgrade to view recommendations
Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges
bytes
connection
Upgrade, Keep-Alive
content-encoding
📦 Gzip(gzip)
content-length
10356
content-type
text/html
date
Thu, 14 May 2026 19:59:09 GMT
Good Warning Issue

Email Infrastructure

Google Workspace

Score

68

SPF
DKIM
DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (5)

aspmx.l.google.com
aspmx3.googlemail.com
alt1.aspmx.l.google.com
alt2.aspmx.l.google.com

+1 more

Domain Information

jeffhuang.com

Domain Age
18y 1m

Created

21.03.2008

Expires

21.03.2031

Last Updated

04.09.2022

Registrar

NameCheap, Inc.

DNSSEC
Not Enabled

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.
D
55/100
Mobile Friendly
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
3 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

-apple-system

WCAG Partial
59/100
Readability
/30
18/30

16px · LH 1.40

Hierarchy
/20
8/20
WCAG
/25
13/25

2.93:1 min contrast

Performance
/25
20/25

System fonts

Heading Font

-apple-system

Sans

Body Font

-apple-system

Sans16px

Contrast Ratio

2.93:1

29 issues

Reading Comfort

~41 CPL

Narrow lines
19px
h2
16px
p

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

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

❌ Very complex text: Flesch score 0/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 29 elements below WCAG AA threshold (min 2.9:1).

❌ Missing H1: Every page should have exactly one H1 element for SEO and accessibility.

❌ Pure vw font sizes: Viewport units alone break browser zoom (WCAG 1.4.4 fail). Use clamp(rem, vw, rem).

Flesch 0

Color Palette

8 unique colors
10.28:1 AAA Light
#fafafa
Background· 68.60000000000001%
#3c3e41
Other· 2%
#26282f
Primary· 6.5%
#2e895d
Secondary· 5.2%
#add1b4
Secondary· 4.5%
#166742
Accent· 1.2%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

1
Google AnalyticsFree

User behavior and product analytics

1

Categories

1

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

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Scripts & Styles

1 Resources

0
Scripts
1
Styles
0
Async
0
Defer

Top Script Sources

Website Identity

jeffhuang.com

18 years old
Location detected: 🇺🇸 United Statesvia ip
NameCheap, Inc.📧 Google Workspaceen

Social Profiles

GitHub

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Last analyzed: 14 May 2026 at 19:59

Historical Analysis & Change Tracking