What does StackOptic analyze?

StackOptic runs 18 analysis modules on any public website from a single URL. It detects 7,000+ technologies (CMS, frameworks, analytics, payments, CDN, hosting), evaluates SSL certificates and HTTP security headers with grades from A+ to F, measures Core Web Vitals (LCP, CLS, TBT, FCP), audits SEO meta tags and structured data, checks email security (SPF, DKIM, DMARC), analyzes AI & LLM readiness including bot access and llms.txt validation, extracts color palettes and typography, estimates carbon footprint, and generates permanent shareable reports.

Does it work on sites behind Cloudflare or bot protection?

Yes. StackOptic uses a real browser engine that loads pages exactly like a human visitor — executing JavaScript, rendering CSS, and handling redirects. This allows it to bypass Cloudflare, LiteSpeed, Sucuri, and other bot protection systems where traditional crawlers and HTTP-only tools fail.

What do I get on the free plan?

The free plan includes 5 analyses per day with access to all 18 modules, full scores, technology detection, and security grades. Every report is permanently accessible via a unique shareable URL — no login required to view. No credit card needed. AI-powered insights, re-analysis, PDF/JSON export, and comparison features are available on Pro ($24/mo) and Agency ($99/mo) plans.

What is AI & LLM readiness analysis?

This module evaluates how visible and citable your website is to AI search engines like ChatGPT, Perplexity, Google AI Overviews, and Claude. It audits access permissions for 8 major AI bots, validates llms.txt and llms-full.txt files, scores citation-ready content structure, and analyzes structured data (JSON-LD) for GEO readiness — helping you rank in the next generation of search.

How long does an analysis take?

Most analyses complete in under 10 seconds. StackOptic runs all 18 modules in parallel using a real browser session, so you get technology detection, security audit, performance metrics, SEO analysis, and AI readiness scoring simultaneously.

How accurate are the results?

Detection is based on real browser execution — DOM inspection, JavaScript runtime analysis, HTTP headers, and DNS records. With 7,000+ technology signatures and Lighthouse-calibrated performance scoring, StackOptic achieves high accuracy for mainstream technologies.

What security checks are performed?

The security module evaluates SSL/TLS certificates, 12+ HTTP security headers (HSTS, CSP, X-Frame-Options, Permissions-Policy, Referrer-Policy), HTTPS enforcement, and email authentication (SPF, DKIM, DMARC). Each site receives a letter grade from A+ to F with specific remediation steps.

Do you store the websites I analyze?

StackOptic only stores publicly available information that any visitor to a website would see — HTML content, HTTP headers, DNS records, and screenshots. We do not access private data, log in to websites, or perform any intrusive testing.

Back to Search

cdlib.org

https://cdlib.org· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

cdlib.org

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

13.33.235.72

Server Location

🇺🇸 New York, United States

ASN

AS16509

Organization

AWS CloudFront (GLOBAL)

Server

Apache

CDN

CloudFront

Nameservers

ns-937.awsdns-53.net.ns-1175.awsdns-18.org.ns-1574.awsdns-04.co.uk.ns-378.awsdns-47.com.

Performance

Page Speed

942 KB

27 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPressv6.1.5

cms

CDLIBv1.0.0

by The CDL Web Production Team (Eric Satzman, Joel Hagedorn, Craig Thompson)

View Theme

Technology Stack

9 Technologies Detected

Plugins

Contact Form 7

Klaro Ui Wordpress Plugin

Libraries

CSS Frameworks

Analytics

Web Servers

CDN

SEO Analysis

C68/100

cdlib.orgcdlib.org

California Digital Library

The California Digital Library exists to support the University of California community’s pursuit of scholarship and to extend the University’s public servic...

Description truncated.

Title Length26 chars

Recommended: 50-60 chars

Description Length167 chars

Recommended: 120-160 chars

Issues (0)

4 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

6 URLs

robots.txt

3 rules

Sponsored

Security Score

21%Critical

Interactive

HTTPS

No WAF

389d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Amazon

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

12.02.2026

Valid Until

13.03.2027

OCSP Stapling

Enabled

Subject Alternative Names (5)

cdlib-prd.web.cdlib.netcdlib-prd.cdlib.orgwww.cdlib.orgcdlinfo.cdlib.orgcdlib.org

SHA-256 Fingerprint

13:73:56:EF:53:1B:F0:A7:6E:1F:8A:7B:92:6A:67:FD:0D:3F:08:81...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

age

265

cache-control

🔴 No Cache(no-cache)

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=UTF-8

date

Tue, 17 Feb 2026 02:33:03 GMT

last-modified

Mon, 16 Feb 2026 20:19:34 GMT

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

cdlib-org.mail.protection.outlook.com

Domain Information

cdlib.org

Domain Age

28 years

Created

06.02.1998

Expires

05.02.2027

Last Updated

06.01.2026

Registrar

Gandi SAS

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Notice (WP)

Cookie Consent Banner

Cookie Notice (WP)

GDPR Indicators

Cookie consent banner detected

CMP: Cookie Notice (WP)

Typography & Readability

Source Sans

63/100

Readability

/30

32/40

21px · LH 1.30

Hierarchy

/20

8/25

1.35x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Source Sans

Sans28px

Body Font

Source Sans

Sans21px

Contrast Ratio

Reading Comfort

~37 CPL

Needs attention

28px

32px

18px

21px

✅ Excellent readability: 21px body text is ideal for all devices.

⚠️ Weak hierarchy: Headlines should be at least 2x body size for clear visual structure.

✅ Good performance: Using 1 font families keeps load times fast.

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

✅ Smart font loading: Using font-display: swap prevents invisible text during load.

✅ Protected text on images: Using gradient for readability.

Buy on MyFonts

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

19 Resources

Scripts

Styles

Async

Defer

Top Script Sources

cdlib.org(10)challenges.cloudflare.com(1)

Website Identity

cdlib.org

28 years old

Gandi SAS📧 Microsoft 365

Social Profiles

X (Twitter)

Sponsored

Last analyzed: 17 Feb 2026 at 02:37

Historical Analysis & Change Tracking