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hyuki.com

https://hyuki.com· First analyzed 07 May 2026· Updated 07 May 2026
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hyuki.com
Desktop screenshot of hyuki.com
Mobile screenshot of hyuki.com
Mobile

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Hosting Provider

Amazon Web Services (AWS)
aws.amazon.com

IP Address

75.2.60.5

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Seattle, United States

ASN

AS16509

Organization

AWS Global Accelerator (GLOBAL)

Server

Netlify

Nameservers

ns1.dns.ne.jp.ns2.dns.ne.jp.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
546 ms10%
Speed Index
710 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
76 KB
18 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Frontend
Styling
Bootstrap
Infrastructure
Platform
Netlify

Technology Stack

3 Technologies Detected

CSS Frameworks

2
Bootstrap
Tailwind CSS

Platforms

1
Netlify

SEO Analysis

D56/100
17
8
1
Meta Tags5/15
Content7/12
Headings8/8
Technical13/25
E-E-A-T3/7
Images1/7
Links2/5
URL5/5
Social5/5
Freshness0/4
Mobile4/4
Indexability3/3
H
hyuki.comhyuki.com

結城浩 / Hiroshi Yuki

書籍『数学ガール』作者、結城浩の個人サイト。数学、プログラミング、文章書きに関する情報と、気軽な読み物。

Title Length18 chars

Recommended: 50-60 chars (~105px / 580px)

Description Length52 chars

Recommended: 120-160 chars

Issues (1)

  • • Most images missing alt text (14/15) — critical for accessibility and SEO

9 issues found

Upgrade to view details

Crawlability

Sitemap
robots.txt

4 rules

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.
7/25
Schema Data
0/25
Citation
8/25

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:6%
Words:157
Token eff.:Too Short
Sections/1K:133.8
Depth:2/5

Structured Data

No Schema

Citation Readiness

Opening Summary
Descriptive Headingsavg 1.2w
Canonical URL
Open Graph3/3
Twitter Card3/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (8)
AI readiness recommendation preview...
Upgrade to view recommendations

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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.
B
79/100
11
Passed
2
Critical
1
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
0/15
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.
74/100
A+
8 mg
CO₂e / view
76.1 KB
Page Weight
95%
Cleaner Than
New Visitor
9 mg
vs
Returning (cached)
4 mg
Annual (10K/mo)
924 g
Emission Segments
Data Center
<0.001 g
Network
2 mg
Device
5 mg
Resource Breakdown
JavaScript
23.7 KB
CSS
45.6 KB
HTML
6.8 KB
Green Hosting Verified
Amazon Web Services (AWS)
Provider Match
3 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
B

Security Score

76%Good
Static / Informational

HTTPS

No WAF

35d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

14.03.2026

Valid Until

12.06.2026

Subject Alternative Names (5)

hyuki.comwww.hyuki.comwww.hyuki.netwww.hyuki.orgwww.textfile.org

SHA-256 Fingerprint

37:E0:93:F0:05:5D:86:A8:27:25:DE:C0:54:83:AB:CA:3F:45:35:9E...

Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges
bytes
access-control-allow-origin
*
age
0
cache-control
🟡 0s(public,max-age=0,must-revalidate)
cache-status
"Netlify Edge"; fwd=miss
content-encoding
⚡ Brotli(br)
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

0

SPF
DKIM
DMARC

Domain Information

hyuki.com

Domain Age
26y 4m

Created

16.12.1999

Expires

16.12.2026

Last Updated

28.10.2025

Registrar

Japan Registry Services Co., Ltd.

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.
C
69/100
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, shrink-to-fit=no
1 recommendation
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Helvetica Neue

WCAG Partial
83/100
Readability
/30
24/30

16px · LH 1.50

Hierarchy
/20
18/20

2.5x ratio · ✓ H1→H6

WCAG
/25
19/25

3.86:1 min contrast

Performance
/25
22/25

System fonts

Heading Font

Helvetica Neue

Sans40px

Body Font

Helvetica Neue

Sans16px

Contrast Ratio

3.86:1

2 issues

Reading Comfort

~36 CPL

Narrow lines
40px
h1
32px
h2
20px
h3
16px
p

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

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

❌ Very complex text: Flesch score 14/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 2 elements below WCAG AA threshold (min 3.9:1).

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

✅ Strong hierarchy: Headlines are 2.5x larger than body text.

Flesch 14

Color Palette

9 unique colors
Light
#f8f9fb
Primary· 32.699999999999996%
#e9e4df
Secondary· 20.7%
#312b26
Text· 11.2%
#675940
Secondary· 6.7%
#8d7154
Secondary· 6.5%
#b99e82
Secondary· 6.3%
#998e76
Secondary· 6%
#c7bfab
Secondary· 5.6%

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

3 Resources

1
Scripts
2
Styles
0
Async
0
Defer

Top Script Sources

cdn.jsdelivr.net(1)

Website Identity

hyuki.com

26 years old
Location detected: 🇺🇸 United Statesvia ip
Japan Registry Services Co., Ltd.ja

Social Profiles

X (Twitter)Bluesky

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Last analyzed: 07 May 2026 at 18:31

Historical Analysis & Change Tracking