numberphile.com

https://numberphile.com· First analyzed 17 May 2026· Updated 17 May 2026

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numberphile.com

Mobile

Sponsored

Hosting Provider

Squarespace

squarespace.com

IP Address

198.49.23.144

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 New York, United States

ASN

AS53831

Organization

Squarespace, Inc.

Server

Squarespace

Nameservers

ns1.hover.com.ns2.hover.com.

Performance

Core Web Vitals

Weight

First Contentful Paint

1.1 s10%

Speed Index

1.4 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

192 KB

48 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Squarespace

website_builder

Technology Stack

6 Technologies Detected

Fonts

Google Fonts Adobe Fonts (Typekit)

Frameworks

Other

CSS Frameworks

Security

SEO Analysis

C66/100

Meta Tags4/15

Content6/12

Headings3/8

Technical20/25

E-E-A-T3/7

Images6/7

Links5/5

URL5/5

Social5/5

Freshness2/4

Mobile4/4

Indexability3/3

numberphile.comnumberphile.com

Numberphile

No description available for this page.

Title Length11 chars

Recommended: 50-60 chars (~66px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

• Missing meta description — important for click-through rates in SERPs
• Missing H1 tag — every page should have exactly one H1

9 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

1,214 URLs

robots.txt

59 rules

Sitemap reference found

Local SEO

Local Search Readiness

12/100

Poor

3 13 1

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

Sponsored

AI & LLM Readiness

D41/100

Bot Access

13/25

Machine Read.

10/25

Schema Data

2/25

Citation

16/25

AI Bot Access

5/14 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:2%

Words:326

Token eff.:Optimal

Sections/1K:55.2

Depth:1/5

Structured Data

1 JSON-LD

WebSite

Citation Readiness

Opening Summary14w

Descriptive Headingsavg 6.6w

Canonical URL

Open Graph2/3

Twitter Card2/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (9)

AI readiness recommendation preview...

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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.

70/100

Passed

Critical

Warnings

Images & Alt Text

20/20

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

Semantic Structure

13/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

10/15

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

3/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

3 recommendations

•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.

67/100

A+

24 mg

CO₂e / view

191.9 KB

Page Weight

95%

Cleaner Than

New Visitor

27 mg

Returning (cached)

14 mg

Annual (10K/mo)

2.8 kg

Emission Segments

Data Center

5 mg

Network

6 mg

Device

13 mg

Resource Breakdown

JavaScript

26.6 KB

Images

63.5 KB

CSS

75.2 KB

Fonts

793 B

HTML

20.2 KB

Other

5.6 KB

Green Hosting Not Verified

Squarespace

3 recommendations

•Carbon footprint recommendation preview...

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Security Score

46%Poor

Interactive

HTTPS

No WAF

78d

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

Valid From

05.05.2026

Valid Until

03.08.2026

Subject Alternative Names (1)

www.numberphile.com

SHA-256 Fingerprint

E7:C5:7D:47:D6:5C:8A:CB:52:E8:EC:5D:DF:5C:00:E0:0C:2B:28:3F...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

age

92002

content-encoding

📦 Gzip(gzip)

content-length

20369

content-type

text/html;charset=utf-8

date

Sat, 16 May 2026 10:04:46 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

mx.hover.com.cust.hostedemail.com

Domain Information

numberphile.com

Domain Age

14y 7m

Created

19.10.2011

Expires

19.10.2026

Last Updated

18.10.2025

Registrar

Tucows Domains Inc.

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.

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

1 recommendation

•Mobile compatibility recommendation preview...

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Typography & Readability

bree-serif

WCAG Partial

63/100

Readability

/30

26/30

17px · LH 1.60

Hierarchy

/20

7/20

WCAG

/25

17/25

3.1:1 min contrast

Performance

/25

13/25

1 font · 1 req

Heading Font

bree-serif

Serif

Body Font

bree-serif

Serif17px

Contrast Ratio

3.1:1

18 issues

Reading Comfort

Single Font Family

left aligned

20px

17px

✅ Excellent readability: 17px body text is ideal for all devices.

✅ Optimal line spacing: 1.60 ratio (ideal range 1.4–1.6).

⚠️ Partial contrast: 18 elements below WCAG AA threshold (min 3.1:1).

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

✅ Lean font stack: 1 font families keeps load times fast.

⚠️ Missing font-display: swap — users may see invisible text while fonts load (FOIT).

GGoogle Fonts AAdobe Fonts Buy on MyFonts

Color Palette

8 unique colors

2.46:1 Fail Light

#ffffff

Background· 98.99999999999997%

#aca49b

Secondary· 0.1%

#6b4f3c

Primary· 0.2%

#8b7b6e

Secondary· 0.2%

#edeae8

Secondary· 0.2%

#c9b6b8

Secondary· 0.1%

#e0d9d7

Secondary· 0.1%

#d3c9c9

Secondary· 0.1%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

24 Resources

Scripts

Styles

Async

Defer

Top Script Sources

assets.squarespace.com(10)definitions.sqspcdn.com(5)use.typekit.net(1)static1.squarespace.com(1)

Website Identity

Numberphile

www.numberphile.com

14 years old

Location detected: 🇺🇸 United Statesvia ip

Tucows Domains Inc.en-US

Sponsored

Last analyzed: 17 May 2026 at 12:38

Historical Analysis & Change Tracking