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

lynda.com

https://lynda.com· First analyzed 14 Feb 2026· Updated 14 Feb 2026

Export

lynda.com

Mobile

Sponsored

Hosting Provider

LinkedIn Corporation

IP Address

108.174.10.24

Server Location

🇺🇸 Ashburn, United States

ASN

AS14413

Organization

LinkedIn Corporation

CDN

Nameservers

ns2-42.azure-dns.net.ns3-42.azure-dns.org.ns4-42.azure-dns.info.dns1.p09.nsone.net.+4 more

Performance

Page Speed

510 KB

94 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Tailwind CSS

CMS

Ghost

Infrastructure

Hosting

LinkedIn Corporation

CDN

Progressive Web App

Web Manifest

Technology Stack

1 Technologies Detected

CSS Frameworks

Tailwind CSS

SEO Analysis

A85/100

lynda.comlynda.com

LinkedIn Learning: Online Training Courses & Skill Building

Accelerate skills & career development for yourself or your team | Business, AI, tech, & creative skills | Find your LinkedIn Learning plan today.

Title Length59 chars

Recommended: 50-60 chars

Description Length146 chars

Recommended: 120-160 chars

Issues (0)

2 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

4550 rules

Sponsored

Security Score

76%Good

Interactive

HTTPS

No WAF

178d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

11.02.2026

Valid Until

11.08.2026

OCSP Stapling

Enabled

Subject Alternative Names (20)

www.linkedin.comlinkedin.comrum5.perf.linkedin.comexp4.www.linkedin.comexp3.www.linkedin.comexp2.www.linkedin.comexp1.www.linkedin.comrum2.perf.linkedin.com+12 more

SHA-256 Fingerprint

95:3B:84:13:73:4D:44:5F:0E:1D:12:FB:73:28:89:6C:71:BA:4C:B8...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-cache, no-store, no-transform)

content-encoding

📦 Gzip(gzip)

content-length

29280

content-security-policy

default-src 'none'; connect-src 'self' *.licdn.com *.linkedi...

content-type

text/html; charset=utf-8

date

Sat, 14 Feb 2026 03:56:01 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (4)

mail-c.linkedin.com

mail-d.linkedin.com

mail-a.linkedin.com

mail.linkedin.com

Domain Information

lynda.com

Domain Age

30y 2m

Created

21.12.1995

Expires

30.10.2026

Last Updated

28.09.2025

Registrar

MarkMonitor Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Cookie consent banner detected

Data Protection Officer mentioned

Typography & Readability

-apple-system

88/100

Readability

/30

40/40

16px · LH 1.50

Hierarchy

/20

18/25

3x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

-apple-system

Sans48px

Body Font

-apple-system

Sans16px

Contrast Ratio

Reading Comfort

~36 CPL

Needs attention

48px

16px

18px

16px

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 3.0x larger than body text.

✅ Excellent performance: System fonts eliminate font loading delays (better LCP).

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

⚠️ Cramped layout: 66 elements lack adequate spacing.

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Social Media

LinkedIn WidgetsFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

5 Resources

Scripts

Styles

Async

Defer

Top Script Sources

static.licdn.com(2)platform.linkedin.com(1)

Website Identity

Sponsored

Last analyzed: 14 Feb 2026 at 03:56

Historical Analysis & Change Tracking