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openlibrary.org

https://openlibrary.org· First analyzed 12 Feb 2026· Updated 12 Feb 2026
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openlibrary.org
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Mobile

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Hosting Provider

IP Address

207.241.234.205

Server Location

🇺🇸 San Francisco, United States

ASN

AS7941

Organization

Internet Archive

Server

Nginx

Nameservers

ns3.archive.org.ns2.archive.org.ns1.archive.org.

Performance

Page Speed

306 KB
77 requests

Image Optimization

Lazy Load
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Ghost

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

3 Technologies Detected

Libraries

1

CSS Frameworks

1

Web Servers

1

SEO Analysis

D52/100
7
5
1
O
openlibrary.orgopenlibrary.org

Welcome to Open Library | Open Library

Open Library is an open, editable library catalog, building towards a web page for every book ever published. Read, borrow, and discover more than 3M books f...

Description truncated.
Title Length38 chars

Recommended: 50-60 chars

Description Length165 chars

Recommended: 120-160 chars

Issues (1)

  • Missing H1 tag - every page should have one H1

Crawlability

Sitemap
robots.txt

41 rules

Sitemap reference found

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F

Security Score

26%Critical
Interactive

HTTPS

No WAF

48d

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

01.01.2026

Valid Until

01.04.2026

Subject Alternative Names (2)

openlibrary.orgwww.openlibrary.org

SHA-256 Fingerprint

5E:13:FA:90:1B:37:8C:07:DC:34:DE:7B:80:5D:6C:C6:36:79:77:B2...

Top Recommendations

Security recommendation preview

HTTP Headers

Developer Console

content-encoding
📦 Gzip(gzip)
content-type
text/html; charset=utf-8
date
Thu, 12 Feb 2026 13:35:24 GMT
referrer-policy
no-referrer-when-downgrade
server
nginx/1.28.1
vary
Accept-Encoding
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

0

SPF
DKIM
DMARC

Domain Information

openlibrary.org

Domain Age
24y 7m

Created

25.06.2001

Expires

25.06.2027

Last Updated

08.07.2025

Registrar

easyDNS Technologies Inc.

DNSSEC
Not Enabled

Typography & Readability

-apple-system

66/100
Readability
/30
30/40

16px · LH --

Hierarchy
/20
8/25
WCAG
/25
15/15

Contrast: undefined

Performance
/25
20/20

System fonts

Heading Font

-apple-system

Sans

Body Font

-apple-system

Sans16px

Contrast Ratio

--

Reading Comfort

~39 CPL

Needs attention
16px
h2
15px
h3
16px
p

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

✅ Excellent performance: System fonts eliminate font loading delays (better LCP).

✅ Consistent design: Single font family with weight variations is a modern best practice.

✅ Protected text on images: Using gradient for readability.

⚠️ Cramped layout: 47 elements lack adequate spacing.

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

1

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

5 Resources

4
Scripts
1
Styles
1
Async
0
Defer

Top Script Sources

local(3)apollo.archive.org(1)

Website Identity

Sponsored

Last analyzed: 12 Feb 2026 at 13:35

Historical Analysis & Change Tracking