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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w3schools.com

https://w3schools.com· First analyzed 10 Feb 2026· Updated 10 Feb 2026

Export

w3schools.com

Mobile

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

13.248.240.135

Server Location

🇨🇦 Montreal, Canada

ASN

AS16509

Organization

AWS Global Accelerator (GLOBAL)

Nameservers

ns-769.awsdns-32.net.ns-1409.awsdns-48.org.ns-1939.awsdns-50.co.uk.ns-314.awsdns-39.com.

Performance

Page Speed

397 KB

37 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Amazon Web Services (AWS)

Technology Stack

9 Technologies Detected

Frameworks

CSS Frameworks

Analytics

Icon Libraries

Tag Managers

SEO Analysis

D58/100

w3schools.comw3schools.com

W3Schools Online Web Tutorials

No description available for this page.

Title Length30 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (1)

• Missing meta description - important for click-through rates

5 issues found

Upgrade to view details

Sponsored

Security Score

41%Poor

Interactive

HTTPS

No WAF

46d

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🟡 2 Hours(public, max-age=9719)

content-encoding

📦 Gzip(gzip)

content-length

51061

content-security-policy

frame-ancestors 'self' https://mycourses.w3schools.com https...

content-type

text/html

date

Tue, 10 Feb 2026 23:43:16 GMT

Good Warning Issue

Typography & Readability

Source Sans Pro + Source Sans Pro Topnav

86/100

Readability

/30

40/40

17px · LH 1.50

Hierarchy

/20

25/25

4.12x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Source Sans Pro

Sans70px

Body Font

Source Sans Pro Topnav

Sans17px

Contrast Ratio

Reading Comfort

Dual Sans-Serif

center aligned

70px

32px

24px

20px

17px

✅ Excellent readability: 17px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 4.1x larger than body text.

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

✅ 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

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

Quantcast ChoiceMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(9)static.fastcmp.com(3)googletagmanager.com(2)gstatic.com(1)sync.sparteo.com(1)

Website Identity

w3schools.com

Sponsored

Last analyzed: 10 Feb 2026 at 23:43

Historical Analysis & Change Tracking