charlespetzold.com

https://charlespetzold.com· First analyzed 12 May 2026· Updated 12 May 2026

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charlespetzold.com

Mobile

Sponsored

Hosting Provider

Newfold Digital, Inc.

IP Address

66.96.146.102

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Jacksonville, United States

ASN

AS29873

Organization

Newfold Digital, Inc.

Nameservers

ns2.verio.com.ns1.verio.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

421 ms10%

Speed Index

547 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

102 KB

3 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Newfold Digital, Inc.

SEO Analysis

D47/100

Meta Tags7/15

Content2/12

Headings8/8

Technical7/21

E-E-A-T3/7

Images4/7

Links4/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

charlespetzold.comcharlespetzold.com

Charles Petzold

Charles Petzold is the author of the books Code and The Annotated Turing

Title Length15 chars

Recommended: 50-60 chars (~88px / 580px)

Description Length72 chars

Recommended: 120-160 chars

Issues (2)

• Very thin content (32 words). Search engines need substantial content for ranking.
• Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

11 issues found

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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.

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AI & LLM Readiness

F35/100

Bot Access

20/25

Machine Read.

6/25

Schema Data

0/25

Citation

9/25

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

navheader/footer

Text ratio:10%

Words:30

Token eff.:Too Short

Sections/1K:20

Depth:2/5

Structured Data

No Schema

Citation Readiness

Opening Summary11w

Descriptive Headingsavg 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.

80/100

Passed

Critical

Warnings

Images & Alt Text

20/20

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

Semantic Structure

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

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.

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.

63/100

A+

13 mg

CO₂e / view

101.8 KB

Page Weight

95%

Cleaner Than

New Visitor

14 mg

Returning (cached)

7 mg

Annual (10K/mo)

1.5 kg

Emission Segments

Data Center

3 mg

Network

3 mg

Device

7 mg

Resource Breakdown

Images

100.3 KB

CSS

709 B

HTML

888 B

Green Hosting Not Verified

Newfold Digital, Inc.

3 recommendations

•Carbon footprint recommendation preview...

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Security Score

21%Critical

Interactive

HTTPS

No WAF

51d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp384r1) (384 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

04.04.2026

Valid Until

03.07.2026

Subject Alternative Names (2)

*.charlespetzold.comcharlespetzold.com

SHA-256 Fingerprint

B9:80:E1:79:AF:2B:7A:02:3F:F5:73:21:9D:A1:A4:16:B8:E8:83:95...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

age

cache-control

🟡 1 Hours(max-age=3600)

content-encoding

⚡ Brotli(br)

content-length

588

content-type

text/html

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

mx.charlespetzold.com

Domain Information

charlespetzold.com

Domain Age

26y 8m

Created

26.08.1999

Expires

26.08.2026

Last Updated

11.08.2025

Registrar

Domain.com - Network Solutions, LLC

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.

32/100

Not 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.

4 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Cambria + Segoe UI

WCAG Partial

79/100

Readability

/30

21/30

16px · LH --

Hierarchy

/20

19/20

2.5x ratio · ✓ H1→H6

WCAG

/25

19/25

1:1 min contrast

Performance

/25

20/25

System fonts

Heading Font

Cambria

Serif40px

Body Font

Segoe UI

Sans16px

Contrast Ratio

1:1

2 issues

Reading Comfort

~82 CPL

Wide lines

40px

24px

19px

16px

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

⚠️ Wide lines: ~82 chars/line. Use max-width: 65ch for comfortable reading.

⚠️ Partial contrast: 2 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 2.5x larger than body text.

✅ System fonts: Zero font loading delay — best possible LCP impact.

Buy on MyFonts

Color Palette

13 unique colors

4.31:1 AA Large Light

#ffffff

Text· 75.00000000000001%

#7d7a6d

Other· 1.7%

#030404

Primary· 3.1%

#627255

Secondary· 2.7%

#45603b

Secondary· 2.6%

#7b9b65

Secondary· 2.6%

#96a585

Secondary· 2.6%

#1b271c

Secondary· 2%

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Scripts & Styles

1 Resources

Scripts

Styles

Async

Defer

Top Script Sources

Website Identity

charlespetzold.com

26 years old

Location detected: 🇺🇸 United Statesvia ip

Domain.com - Network Solutions, LLCen

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Last analyzed: 12 May 2026 at 19:34

Historical Analysis & Change Tracking