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esferalibros.com

https://esferalibros.com· First analyzed 13 May 2026· Updated 13 May 2026
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esferalibros.com
Desktop screenshot of esferalibros.com
Mobile screenshot of esferalibros.com
Mobile

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Hosting Provider

Unknown Provider

Performance

80

Core Web Vitals

Weight

First Contentful Paint
2.2 s10%
Speed Index
2.9 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
14.6 MB
140 requests

Image Optimization

Lazy LoadResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Frontend
Styling
Bootstrap
CMS
WordPressv6.9.4

Technology Stack

24 Technologies Detected

Plugins

6
Toolset BlocksSimple TagsJs_ComposerRevsliderPixelyoursite
Yoast SEO

Libraries

3
jQueryv1.11.2
jQuery UI
Underscore.js

Analytics

3
Google Analytics
Google Analytics 4
Facebook Pixel

CSS Frameworks

2
Bootstrapv4.5.3
Tailwind CSS

Icon Libraries

2
Font AwesomeIonicons

Other

1
GSAP

UI Components

1
Owl Carousel

Other

1
Modernizr

Fonts

1
Google Fonts

Tag Managers

1
Google Tag Manager

Web Servers

1
Apache

Languages

1
PHPv7.4.33

Customer Support

1
Zendesk

SEO Analysis

B72/100
21
6
2
Meta Tags13/15
Content3/12
Headings5/8
Technical24/25
E-E-A-T0/7
Images3/7
Links5/5
URL5/5
Social4/5
Freshness4/4
Mobile3/4
Indexability3/3
E
esferalibros.comesferalibros.com

Librería online - La Esfera de los Libros

En nuestra librería online encontrarás las últimas novedades en libros y best sellers. Información de autores y colecciones para todos los lectores. ¡Encuent...

Description truncated.
Title Length41 chars

Recommended: 50-60 chars (~243px / 580px)

Description Length169 chars

Recommended: 120-160 chars

Issues (2)

  • • Very thin content (8 words). Search engines need substantial content for ranking.
  • • Most images missing alt text (129/140) — critical for accessibility and SEO

8 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

23 URLs

23 sub-sitemaps

robots.txt

4 rules

Sitemap reference found

Local SEO

Local Search Readiness

15/100
Poor
4 12 1

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

F36/100
Bot Access
20/25
Machine Read.
1/25
Schema Data
4/25
Citation
11/25

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
Text ratio:0%
Words:0
Token eff.:Too Short

Structured Data

3 JSON-LD
WebSiteBreadcrumbListSearchAction

Citation Readiness

Opening Summary1552w
Descriptive Headings
Canonical URL
Open Graph2/3
Twitter Card1/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (11)
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.
B
76/100
12
Passed
2
Critical
2
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
18/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
5/15
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
11/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
7/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
2 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.
7/100
F
1.85 g
CO₂e / view
14.6 MB
Page Weight
5%
Cleaner Than
New Visitor
2.12 g
vs
Returning (cached)
1.06 g
Annual (10K/mo)
222.5 kg
Emission Segments
Data Center
414 mg
Network
445 mg
Device
995 mg
Resource Breakdown
JavaScript
2.0 MB
Images
10.6 MB
CSS
1.8 MB
Fonts
3.6 KB
HTML
336.6 KB
Other
617 B
Green Hosting Not Verified
10 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
D

Security Score

41%Poor
Interactive

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

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

06.05.2026

Valid Until

04.08.2026

Subject Alternative Names (2)

esferalibros.comwww.esferalibros.com

SHA-256 Fingerprint

5B:59:B8:C8:5E:C3:7C:3C:95:EC:67:93:15:4B:B4:41:53:AC:29:71...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

connection
Keep-Alive
content-length
344390
content-security-policy
upgrade-insecure-requests;
content-type
text/html; charset=UTF-8
date
Wed, 13 May 2026 22:47:19 GMT
keep-alive
timeout=5, max=100
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

50

SPF
DKIM
DMARC

MX Records (2)

mxa-005a2501.gslb.pphosted.com
mxb-005a2501.gslb.pphosted.com

Domain Information

esferalibros.com

Domain Age
25y 2m

Created

08.03.2001

Expires

08.03.2027

Last Updated

02.03.2026

Registrar

EuroDNS S.A.

DNSSEC
Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner
Cookiebot
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected
CMP: Cookiebot
Privacy policy page linked
Legitimate interest basis mentioned

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.
A
81/100
Mobile Friendly36 breakpoints
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,user-scalable=yes
1 recommendation
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Cormorant Garamond

WCAG Partial
57/100
Readability
/30
13/30

19px · LH 2.40

Hierarchy
/20
10/20

2.37x ratio

WCAG
/25
18/25

2.85:1 min contrast

Performance
/25
16/25

1 font · 4 req

Heading Font

Cormorant Garamond

Sans45px

Body Font

Cormorant Garamond

Sans19px

Contrast Ratio

2.85:1

13 issues

Reading Comfort

~33 CPL

Narrow lines
45px
h1
25px
h4
19px
p

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

⚠️ Wide line spacing (2.40). 1.4–1.6 is optimal for body text.

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

⚠️ Partial contrast: 13 elements below WCAG AA threshold (min 2.9:1).

❌ Broken heading hierarchy: 2 level skip(s). Screen readers rely on sequential headings (h1→h2→h3).

✅ Strong hierarchy: Headlines are 2.4x larger than body text.

GGoogle FontsBuy on MyFontsFluid Type (rem)Flesch 0

Color Palette

11 unique colors
Light
#ffffff
Background· 61.6%
#0787d2
Accent· 11%
#1034ce
Primary· 4.7%
#d4dfe5
Secondary· 3.8%
#32b8f1
Accent· 3.5%
#8ad0f6
Accent· 3.1%
#1ba6e6
Accent· 3%
#654d73
Secondary· 3%

Business & Marketing Stack

4 Tools Detected

Advanced

Behavior Analytics

2
Google Tag ManagerFree
Google AnalyticsFree

User behavior and product analytics

Advertising

1
Facebook PixelMid-Market

Ad platforms and retargeting pixels

Privacy & Cookies

1
CookiebotMid-Market

Cookie consent and privacy compliance tools

3

Categories

4

Total Tools

0

Enterprise

2

Mid-Market

Assessment: Well-developed marketing technology stack

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Scripts & Styles

30 Resources

20
Scripts
10
Styles
10
Async
0
Defer

Top Script Sources

esferalibros.com(9)googletagmanager.com(3)connect.facebook.net(2)consent.cookiebot.com(2)google-analytics.com(1)

Website Identity

Librería online - La Esfera de los Libros

En nuestra librería online encontrarás las últimas novedades en libros y best sellers. Información de autores y colecciones para todos los lectores. ¡Encuentra tu libro!

www.esferalibros.com/
25 years old
EuroDNS S.A.es

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Last analyzed: 13 May 2026 at 22:47

Historical Analysis & Change Tracking