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

coursera.org

https://coursera.org· First analyzed 10 Feb 2026· Updated 10 Feb 2026

Export

coursera.org

Mobile

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

18.239.50.105

Server Location

🇳🇱 Amsterdam, The Netherlands

ASN

AS16509

Organization

AWS CloudFront (GLOBAL)

Server

Envoy

CDN

CloudFront

Nameservers

ns-1590.awsdns-06.co.uk.ns-258.awsdns-32.com.ns-688.awsdns-22.net.ns-1481.awsdns-57.org.

Performance

Page Speed

7 KB

43 requests

0–49

50–89

90–100

Architecture Stack

Headless

⚙️ SSR

Decoupled

API

Data Source

Headless CMS

Contentful

Infrastructure

Hosting

Amazon Web Services (AWS)

CDN

CloudFront

Detected API Sources

https://d3njjcbhbojbot.cloudfr...

Technology Stack

6 Technologies Detected

CSS Frameworks

Analytics

Meta Frameworks

Frameworks

SEO Analysis

B72/100

coursera.orgcoursera.org

Coursera | Courses, Professional Certificates, and Degrees Online

Learn in-demand skills with online courses and Professional Certificates from leading companies like Google, IBM, Meta, and Adobe. Explore flexible programs—...

Description truncated.

Title Length65 chars

Recommended: 50-60 chars

Description Length192 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (25/34)

3 issues found

Upgrade to view details

Sponsored

Security Score

56%Poor

Interactive

HTTPS

No WAF

100d

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

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

content-encoding

📦 Gzip(gzip)

content-type

text/html

date

Tue, 10 Feb 2026 22:30:01 GMT

etag

W/"ade9e-CITOrAxW4wPblIQ3coNFW/dK7bo"

server

envoy

Good Warning Issue

Typography & Readability

Arial

80/100

Readability

/30

32/40

14px · LH 1.43

Hierarchy

/20

25/25

3.43x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Arial

Sans48px

Body Font

Arial

Sans14px

Contrast Ratio

Reading Comfort

~40 CPL

Needs attention

48px

28px

20px

14px

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

✅ Optimal line spacing: 1.43 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 3.4x 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.

Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Social Media

Facebook SDKFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

4 Resources

Scripts

Styles

Async

Defer

Top Script Sources

d3njjcbhbojbot.cloudfront.net(2)browser.sentry-cdn.com(1)

Website Identity

coursera.org

Sponsored

Last analyzed: 10 Feb 2026 at 22:30

Historical Analysis & Change Tracking