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.

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thriftbooks.com

https://thriftbooks.com· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

thriftbooks.com

Sponsored

Hosting Provider

Fastly, Inc.

IP Address

151.101.130.7

Server Location

🇨🇦 Montreal, Canada

ASN

AS54113

Organization

Fastly, Inc.

Server

Microsoft IIS

CDN

Fastly

Nameservers

ns12.domaincontrol.com.ns11.domaincontrol.com.

Performance

Page Speed

261 KB

55 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Headless

⚙️ SSR

Decoupled

Frontend

Framework

React

API

Data Source

Headless CMS

Strapi

Infrastructure

Hosting

Fastly, Inc.

CDN

Fastly

Detected API Sources

https://i.thriftbooks.com/api/...

Technology Stack

11 Technologies Detected

Analytics

Frameworks

Meta Frameworks

CSS Frameworks

Icon Libraries

Tag Managers

Reviews

Web Servers

Customer Support

SEO Analysis

A+90/100

thriftbooks.comthriftbooks.com

New & Used Books | Buy Cheap Books Online at ThriftBooks

Over 13 million titles available from the largest seller of used books. Cheap prices on high quality gently used books. Free shipping over $15.

Title Length56 chars

Recommended: 50-60 chars

Description Length143 chars

Recommended: 120-160 chars

Issues (0)

1 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

robots.txt

36 rules

Sitemap reference found

Sponsored

Security Score

56%Poor

Interactive

HTTPS

No WAF

96d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

GoDaddy.com, Inc.

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/2

Valid From

22.04.2025

Valid Until

24.05.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.thriftbooks.comthriftbooks.com

SHA-256 Fingerprint

3E:E6:FB:D6:2D:6C:64:3C:B3:FC:A6:A1:3E:8B:FD:28:3B:4F:79:B4...

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

backend-name

67p76nAHuMJBmLDjaSYYf0--F_sigsci_waf

bluegreen

green

cache-control

🔴 No Cache(private, no-store, must-revalidate, no-cache, max-age=0)

content-encoding

📦 Gzip(gzip)

content-security-policy

frame-ancestors 'self'

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

thriftbooks-com.mail.protection.outlook.com

Domain Information

thriftbooks.com

Domain Age

22y 8m

Created

04.06.2003

Expires

04.06.2026

Last Updated

05.06.2024

Registrar

GoDaddy.com, LLC

DNSSEC

Not Enabled

Privacy & Compliance

Osano

Cookie Consent Banner

Osano

GDPR Indicators

Cookie consent banner detected

CMP: Osano

Data Protection Officer mentioned

Typography & Readability

Tahoma + Helvetica

68/100

Readability

/30

32/40

16px · LH 1.25

Hierarchy

/20

18/25

2.44x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Tahoma

Sans39px

Body Font

Helvetica

Sans16px

Contrast Ratio

Reading Comfort

~95 CPL

Needs attention

39px

31px

13px

16px

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

✅ Strong hierarchy: Headlines are 2.4x larger than body text.

✅ Good performance: Using 2 font families keeps load times fast.

⚠️ Wide lines: ~95 chars/line. Consider max-width for better reading flow.

⚠️ Cramped layout: 9 elements lack adequate spacing.

✅ Clean layout: Consistent left alignment throughout.

Buy on MyFonts

Business & Marketing Stack

9 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

Microsoft ClarityFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

Pinterest AdsMid-Market

CriteoEnterprise

Reddit PixelMid-Market

Ad platforms and retargeting pixels

Privacy & Cookies

OsanoMid-Market

Cookie consent and privacy compliance tools

Reviews & Social Proof

TrustpilotMid-Market

Customer reviews and testimonials

Sponsored

Scripts & Styles

17 Resources

Scripts

Styles

Async

Defer

Top Script Sources

static.thriftbooks.com(6)googletagmanager.com(3)local(3)js.appboycdn.com(1)cmp.osano.com(1)

Website Identity

thriftbooks.com

22 years old

GoDaddy.com, LLC📧 Microsoft 365

Social Profiles

Facebook X (Twitter)Instagram Pinterest

Sponsored

Last analyzed: 17 Feb 2026 at 10:31

Historical Analysis & Change Tracking