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

alibris.com

https://alibris.com· First analyzed 18 Feb 2026· Updated 18 Feb 2026

Export

alibris.com

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

104.18.153.95

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

ns4.alibris.com.ns5.alibris.com.

Performance

Page Speed

45 KB

109 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Bootstrap

Infrastructure

Hosting

Cloudflare

CDN

Cloudflare

Technology Stack

12 Technologies Detected

Analytics

Libraries

CSS Frameworks

Advertising

Google Ads Microsoft Advertising

Meta Frameworks

Astro

Tag Managers

Google Tag Manager

CDN

Cloudflare

SEO Analysis

B72/100

alibris.comalibris.com

Alibris - Buy new and used books, textbooks, music and movies

No description available for this page.

Title Length61 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (1)

• Missing meta description - important for click-through rates

3 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

53 rules

Sitemap reference found

Sponsored

Security Score

61%Fair

Interactive

HTTPS

WAF

76d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

04.02.2026

Valid Until

05.05.2026

Subject Alternative Names (1)

www.alibris.com

SHA-256 Fingerprint

E3:94:02:85:25:F4:83:8D:71:32:1C:70:F2:D1:16:A8:24:42:3B:F5...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

date

Wed, 18 Feb 2026 05:59:28 GMT

content-type

text/html; charset=ISO-8859-1

content-encoding

📦 Gzip(gzip)

set-cookie

JSESSIONID

x-powered-by

Servlet/2.5 JSP/2.1

x-frame-options

SAMEORIGIN

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

100

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (2)

mx2-us1.ppe-hosted.com

mx1-us1.ppe-hosted.com

Domain Information

alibris.com

Domain Age

27y 11m

Created

01.04.1998

Expires

31.03.2026

Last Updated

31.03.2025

Registrar

GoDaddy.com, LLC

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

Georgia

61/100

Readability

/30

22/40

14px · LH --

Hierarchy

/20

21/25

2.5x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Georgia

Serif35px

Body Font

Georgia

Serif14px

Contrast Ratio

Reading Comfort

~90 CPL

Needs attention

35px

16px

22px

14px

⚠️ Small text: 14px may be hard to read on mobile. Consider 16px+.

✅ Strong hierarchy: Headlines are 2.5x larger than body text.

✅ 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.

⚠️ Wide lines: ~90 chars/line. Consider max-width for better reading flow.

Buy on MyFonts

Business & Marketing Stack

4 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

Microsoft AdsEnterprise

Ad platforms and retargeting pixels

Sponsored

Scripts & Styles

26 Resources

Scripts

Styles

Async

Defer

Top Script Sources

alibris-static.com(5)googletagmanager.com(3)connect.facebook.net(2)static.sitejabber.com(2)bat.bing.com(1)

Website Identity

alibris.com

27 years old

GoDaddy.com, LLC

Social Profiles

Facebook Instagram TikTok Pinterest Bluesky

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Last analyzed: 18 Feb 2026 at 05:59

Historical Analysis & Change Tracking