What technology does openlibrary.org use?

openlibrary.org is built with Nginx.

Is openlibrary.org secure (HTTPS)?

Yes. openlibrary.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 28, 2026.

Who hosts openlibrary.org?

Hosting provider information for openlibrary.org is not available yet.

What is openlibrary.org's SEO score?

openlibrary.org scored 60/100 for SEO in the latest analysis (fair).

What is openlibrary.org's overall website score?

openlibrary.org has an overall SiteGraph score of 77/100, combining SEO, performance, security, and accessibility.

openlibrary.org

Welcome to Open Library | Open Library

Last scanned Jul 21, 2026, 12:33 PM · 2 views

Overall score

Fair

Top issues to fix

11 issues found · 3 high priority

Missing Strict-Transport-Security header
Security
Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
Security
Add a CSP to control which sources can run scripts — the strongest single defense against XSS.
No H1 heading found
SEO
Add exactly one H1 describing the page's main topic — it anchors the document outline for search engines and screen readers.
Missing X-Content-Type-Options header
Security
Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
Security
Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Meta description longer than 160 characters
SEO
Trim the meta description to under 160 characters to avoid truncation in search results.

+5 more issues — details in the sections below.

Summary

Open Library is an open, editable library catalog, building towards a web page for every book ever published. This website uses Nginx. SEO is fair (60/100) and accessibility is excellent (90/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Meta description longer than 160 characters.

SEO

6 issue(s) found

100

Performance

669 ms

Security

HTTPS & header checks

Accessibility

1 issue(s) found

Not enough scan history yet to show a trend — check back after this site has been re-scanned a few more times.

Organization

Company details published in this site's own structured data.

X (Twitter)

Contact

Email, phone, and address published on this site's own pages.

Email: openlibrary@archive.org

Meta tags

Title: Welcome to Open Library | Open Library
Description: 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 for free.
Canonical: https://openlibrary.org/
Language: en
Charset: utf-8
Viewport: width=device-width, initial-scale=1.0
Robots meta
Manifest: https://openlibrary.org/static/manifest.json

Technologies

Detected frameworks, languages, and tools.

Nginx

Hosting & CDN

Hosting provider: —
CDN provider: —
IP address: —
ASN: —

DNS records

Type	Value
A	—
AAAA	—
MX	—
TXT	—
NS	—
CAA	—
CNAME	—
IPv6 support	No

TLS / SSL certificate

Version: TLS 1.3
Issuer: Let's Encrypt
Subject: www.openlibrary.org
Valid from: Jun 30, 2026
Valid to: Sep 28, 2026
Days until expiry: 69
SAN domains: openlibrary.org, www.openlibrary.org

Security headers

Strict-Transport-SecurityMissing
Content-Security-PolicyMissing
X-Frame-OptionsMissing
X-Content-Type-OptionsMissing
Referrer-PolicyEnabled
Permissions-PolicyMissing

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 0 · H2 12 · H3 1

Links

109 internal · 22 external · 10 broken

Images

69 total · 0 missing alt

Scripts / Styles

13 scripts · 3 stylesheets

JS / CSS size

696 KB · 0 B

Page size

85.7 KB

Robots.txt & Sitemap

robots.txt: Not found
Disallow rules: 0
sitemap.xml: Not found
URLs in sitemap: 0

SEO issues

Meta description longer than 160 characters
No H1 heading found
No structured data (JSON-LD) found
Missing OpenGraph tags
robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://openlibrary.org
Final URL: https://openlibrary.org
HTTP status: 200
HTTP version: HTTP/2
Response time: 668 ms
HTML size: 85.7 KB
Redirect chain: https://openlibrary.org

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Frequently asked questions

What technology does openlibrary.org use?: openlibrary.org is built with Nginx.
Is openlibrary.org secure (HTTPS)?: Yes. openlibrary.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 28, 2026.
Who hosts openlibrary.org?: Hosting provider information for openlibrary.org is not available yet.
What is openlibrary.org's SEO score?: openlibrary.org scored 60/100 for SEO in the latest analysis (fair).
What is openlibrary.org's overall website score?: openlibrary.org has an overall SiteGraph score of 77/100, combining SEO, performance, security, and accessibility.