sigil-ebook.com

https://sigil-ebook.com· First analyzed 11 May 2026· Updated 11 May 2026

Export

sigil-ebook.com

Mobile

Sponsored

Hosting Provider

GitHub Pages

pages.github.com

IP Address

185.199.111.153

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 San Francisco, United States

ASN

AS54113

Organization

GitHub, Inc

Server

GitHub.com

CDN

Fastly

Nameservers

ns70.domaincontrol.com.ns69.domaincontrol.com.

Performance

Core Web Vitals

Weight

First Contentful Paint

6.8 s10%

Speed Index

8.8 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

213 KB

9 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Platform

GitHub Pages

CDN

Fastly

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

2 Technologies Detected

CSS Frameworks

Tailwind CSS

Icon Libraries

Font Awesome

SEO Analysis

C64/100

Meta Tags4/15

Content7/12

Headings3/8

Technical22/25

E-E-A-T5/7

Images4/7

Links5/5

URL5/5

Social2/5

Freshness0/4

Mobile4/4

Indexability3/3

sigil-ebook.comsigil-ebook.com

Sigil-Ebook

No description available for this page.

Title Length11 chars

Recommended: 50-60 chars (~61px / 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

132 URLs

robots.txt

1 rules

Sitemap reference found

Allows all crawlers

Local SEO

Local Search Readiness

7/100

Poor

2 14 1

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.

4/25

Schema Data

3/25

Citation

12/25

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:6%

Words:77

Token eff.:Too Short

Sections/1K:20

Depth:1/5

Structured Data

1 JSON-LD

Person×1.3

Citation Readiness

Opening Summary15w

Descriptive Headingsavg 4w

Canonical URL

Open Graph1/3

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.

77/100

Passed

Critical

Warnings

Images & Alt Text

20/20

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

Semantic Structure

11/20

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

3/15

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

1 recommendation

•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.

62/100

A+

26 mg

CO₂e / view

213.1 KB

Page Weight

95%

Cleaner Than

New Visitor

30 mg

Returning (cached)

15 mg

Annual (10K/mo)

3.2 kg

Emission Segments

Data Center

6 mg

Network

6 mg

Device

14 mg

Resource Breakdown

JavaScript

62.7 KB

Images

122.0 KB

CSS

25.7 KB

HTML

2.7 KB

Green Hosting Not Verified

GitHub Pages

3 recommendations

•Carbon footprint recommendation preview...

Upgrade to view recommendations

Security Score

21%Critical

Interactive

HTTPS

No WAF

69d

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/2

Valid From

21.04.2026

Valid Until

20.07.2026

Subject Alternative Names (2)

sigil-ebook.comwww.sigil-ebook.com

SHA-256 Fingerprint

BF:75:F3:D4:C3:25:8B:43:93:4A:EE:CB:C4:A6:BB:E0:B9:83:73:E2...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

access-control-allow-origin

age

cache-control

🟡 600s(max-age=600)

content-encoding

📦 Gzip(gzip)

content-length

2480

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

Domain Information

sigil-ebook.com

Domain Age

14y 6m

Created

25.10.2011

Expires

25.10.2026

Last Updated

26.10.2025

Registrar

GoDaddy.com, 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.

64/100

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=1.0

2 recommendations

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

-apple-system

WCAG Partial

71/100

Readability

/30

24/30

19px · LH 1.50

Hierarchy

/20

8/20

WCAG

/25

17/25

1.2:1 min contrast

Performance

/25

22/25

System fonts

Heading Font

-apple-system

Sans

Body Font

-apple-system

Sans19px

Contrast Ratio

1.2:1

11 issues

Reading Comfort

~33 CPL

Narrow lines

31px

20px

19px

✅ Excellent readability: 19px body text is ideal for all devices.

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

❌ Very complex text: Flesch score 25/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 11 elements below WCAG AA threshold (min 1.2:1).

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

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

Flesch 25

Color Palette

7 unique colors

Light

#262a35

Secondary· 83.19999999999999%

#006981

Accent· 6.6000000000000005%

#ffffff

Primary· 0%

#025b6c

Accent· 2.7%

#4b7884

Secondary· 2.4%

#b9ccd0

Secondary· 2.2%

#191d26

Secondary· 2.1%

#27545f

Secondary· 0.8%

Sponsored

Scripts & Styles

7 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(4)

Website Identity

Sigil

Person

sigil-ebook.com/

14 years old

Location detected: 🇺🇸 United Statesvia ip

GoDaddy.com, LLCen

Social Profiles

GitHub

Sponsored

Last analyzed: 11 May 2026 at 23:29

Historical Analysis & Change Tracking