StackOptic
Back to Search
hebrewbooks.org favicon

hebrewbooks.org

https://hebrewbooks.org· First analyzed 14 May 2026· Updated 14 May 2026
Export
hebrewbooks.org
Desktop screenshot of hebrewbooks.org
Mobile screenshot of hebrewbooks.org
Mobile

Sponsored

Hosting Provider

Cloudflare
cloudflare.com

IP Address

172.66.43.90

Site Location

🇨🇦 Canadavia ip

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

fay.ns.cloudflare.com.todd.ns.cloudflare.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
371 ms10%
Speed Index
482 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
48 KB
19 requests

Image Optimization

Lazy Load
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Cloudflare
CDN
Cloudflare

Technology Stack

4 Technologies Detected

Analytics

2
Google Analytics
Google Analytics 4

CSS Frameworks

1
Tailwind CSS

CDN

1
Cloudflare

SEO Analysis

D45/100
11
12
2
Meta Tags7/15
Content8/12
Headings3/8
Technical7/25
E-E-A-T0/7
Images3/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile4/4
Indexability3/3
H
hebrewbooks.orghebrewbooks.org

HebrewBooks.org Home Page

Over 40,000 Seforim/Hebrew books for Free in PDF Format. Rambam, Shas, Meforshim in text format.

Title Length25 chars

Recommended: 50-60 chars (~158px / 580px)

Description Length96 chars

Recommended: 120-160 chars

Issues (2)

  • • Missing H1 tag — every page should have exactly one H1
  • • Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

14 issues found

Upgrade to view details

Crawlability

Sitemap
robots.txt

2 rules

Local SEO

Local Search Readiness

9/100
Poor
3 12 2

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

Sponsored

AI & LLM Readiness

F27/100
Bot Access
20/25
Machine Read.
1/25
Schema Data
0/25
Citation
6/25

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:5%
Words:178
Token eff.:Too Short
Sections/1K:11.2

Structured Data

No Schema

Citation Readiness

Opening Summary24w
Descriptive Headingsavg 5.5w
Canonical URL
Open Graph0/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (12)
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.
D
40/100
4
Passed
9
Critical
1
Warnings
Images & Alt Text
10/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
4/20
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
2/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
4/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
5 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.
73/100
A+
5 mg
CO₂e / view
47.8 KB
Page Weight
95%
Cleaner Than
New Visitor
6 mg
vs
Returning (cached)
3 mg
Annual (10K/mo)
576 g
Emission Segments
Data Center
<0.001 g
Network
1 mg
Device
3 mg
Resource Breakdown
JavaScript
22.7 KB
Images
15.2 KB
CSS
3.1 KB
HTML
6.8 KB
Green Hosting Verified
Cloudflare
GWF Verified
4 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
F

Security Score

26%Critical
Interactive

HTTPS

WAF

53d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

08.04.2026

Valid Until

07.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

hebrewbooks.org*.hebrewbooks.org

SHA-256 Fingerprint

A4:57:61:D7:02:92:80:33:B8:0E:BB:BD:98:91:A0:2A:89:C1:7F:F7...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations
Upgrade to view header details

HTTP Headers

Developer Console

alt-svc
h3=":443"; ma=86400
cache-control
🟣 Private(private)
cf-apo-via
origin,host
cf-cache-status
DYNAMIC
cf-ray🇮🇹 Milan
9fb99fc30e6aedd7-MXP
content-encoding
⚡ Brotli(br)
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

45

SPF
DKIM
DMARC

MX Records (1)

mx.mydomain.com

Domain Information

hebrewbooks.org

Domain Age
27y 1m

Created

06.04.1999

Expires

06.04.2032

Last Updated

06.04.2022

Registrar

Network Solutions, LLC

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

GDPR Indicators

Privacy policy page linked

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.
F
35/100
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...
Upgrade to view recommendations

Typography & Readability

Arial

WCAG AAA
64/100
Readability
/30
12/30

13px · LH --

Hierarchy
/20
8/20
WCAG
/25
24/25

7.52:1 min contrast

Performance
/25
20/25

System fonts

Heading Font

Arial

Sans

Body Font

Arial

Sans13px

Contrast Ratio

7.52:1

WCAG AAA (≥7:1)

Reading Comfort

Single Font Family

center aligned
20px
h2
13px
p

❌ Critical: 13px body text is too small. Minimum 14px, recommend 16px+.

❌ Very complex text: Flesch score 26/100. Consider shorter sentences and simpler words.

✅ WCAG AAA contrast: All text meets 7:1 ratio (min 7.5:1).

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

Flesch 26

Color Palette

9 unique colors
2.81:1 Fail Light
#ffffff
Background· 88.39999999999999%
#a09991
Other· 1.2%
#ebe3d6
Primary· 3.6999999999999997%
#cabeb5
Secondary· 1.8%
#69331b
Accent· 1.4%
#bf9d88
Secondary· 1.2%
#f4f2eb
Secondary· 1%
#855f4a
Secondary· 0.5%

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

Sponsored

Scripts & Styles

8 Resources

7
Scripts
1
Styles
1
Async
0
Defer

Top Script Sources

media(5)d2g9qbzl5h49rh.cloudfront.net(1)googletagmanager.com(1)

Website Identity

hebrewbooks.org

update@hebrewbooks.org
023763437
27 years old
Location detected: 🇨🇦 Canadavia ip
Network Solutions, LLC

Sponsored

Last analyzed: 14 May 2026 at 11:39

Historical Analysis & Change Tracking