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

audible.com

https://audible.com· First analyzed 12 Feb 2026· Updated 12 Feb 2026

Export

audible.com

Mobile

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

44.215.128.228

Server Location

🇺🇸 Ashburn, United States

ASN

AS14618

Organization

Amazon Technologies Inc. (us-east-1)

Server

CDN

CloudFront

Nameservers

ns1.amzndns.com.ns1.amzndns.net.ns1.amzndns.org.ns2.amzndns.co.uk.+4 more

Performance

Page Speed

130 KB

74 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Amazon Web Services (AWS)

CDN

CloudFront

Progressive Web App

Service WorkerApple Touch Icon

Technology Stack

11 Technologies Detected

Advertising

Google Ads Twitter Ads Snapchat Pixel Microsoft Advertising

Analytics

Frameworks

Libraries

Other

CSS Frameworks

Customer Support

SEO Analysis

A84/100

audible.comaudible.com

Audible

Try Audible free for 30 days! Start listening to best-selling audiobooks, exclusive Originals, and free podcasts with the Audible app.

Title Length7 chars

Recommended: 50-60 chars

Description Length134 chars

Recommended: 120-160 chars

Issues (0)

2 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

robots.txt

404 rules

Sitemap reference found

Sponsored

Security Score

46%Poor

Interactive

HTTPS

No WAF

217d

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

24.09.2025

Valid Until

17.09.2026

OCSP Stapling

Enabled

Subject Alternative Names (4)

www.audible.comios.audible.comaudible.comorigin-www.audible.com

SHA-256 Fingerprint

65:AD:E0:C3:52:12:52:55:2E:DD:63:08:1F:0E:DE:49:1A:19:90:80...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ch

ect,rtt,downlink,device-memory,sec-ch-device-memory,viewport...

accept-ch-lifetime

86400

content-encoding

📦 Gzip(gzip)

content-language

en-GB

content-security-policy-report-only

default-src 'self';base-uri 'none';frame-ancestors 'self';fr...

content-type

text/html;charset=UTF-8

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

amazon-smtp.amazon.com

Domain Information

audible.com

Domain Age

29y 2m

Created

05.12.1996

Expires

04.12.2026

Last Updated

30.11.2024

Registrar

CSC Corporate Domains, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

Arial

73/100

Readability

/30

32/40

14px · LH 1.43

Hierarchy

/20

13/25

1.86x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Arial

Sans26px

Body Font

Arial

Sans14px

Contrast Ratio

Reading Comfort

Single Font Family

left aligned

26px

20px

14px

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

✅ Optimal line spacing: 1.43 ratio ensures comfortable reading.

✅ Good hierarchy: Clear distinction between headlines and 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.

✅ Clean layout: Consistent left alignment throughout.

Buy on MyFonts

Business & Marketing Stack

9 Tools Detected

Enterprise

Behavior Analytics

Google AnalyticsFree

Google Tag ManagerFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

Twitter/X AdsMid-Market

Microsoft AdsEnterprise

Snapchat PixelMid-Market

Ad platforms and retargeting pixels

Social Media

Facebook SDKFree

Twitter/X WidgetsFree

Social widgets and sharing tools

Affiliate & Partnerships

ImpactEnterprise

Affiliate networks and partner tracking

Sponsored

Scripts & Styles

26 Resources

Scripts

Styles

Async

Defer

Top Script Sources

googletagmanager.com(4)m.media-amazon.com(4)bat.bing.com(3)connect.facebook.net(2)d34r8q7sht0t9k.cloudfront.net(1)

Website Identity

audible.com

29 years old

CSC Corporate Domains, Inc.

Sponsored

Last analyzed: 12 Feb 2026 at 12:12

Historical Analysis & Change Tracking