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

siu.edu

https://siu.edu· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

siu.edu

Sponsored

Hosting Provider

Southern Illinois University Carbondale

IP Address

131.230.21.130

Server Location

🇺🇸 Carbondale, United States

ASN

AS15119

Organization

Southern Illinois University Carbondale

Server

Apache

Nameservers

ns4.siu.edu.ns5.siu.edu.ns1.siu.edu.ns3.siu.edu.

Performance

Page Speed

2.1 MB

97 requests

0–49

50–89

90–100

Architecture Stack

Headless

⚙️ SSR

Decoupled

Frontend

Styling

Bootstrap

API

Data Source

Headless CMS

Strapi

Infrastructure

Hosting

Southern Illinois University Carbondale

Detected API Sources

https://player.vimeo.com/api/p...

Technology Stack

15 Technologies Detected

Analytics

Google Analytics

Google Analytics 4

Facebook Pixel Microsoft Clarity Segment

CSS Frameworks

Libraries

UI Components

Icon Libraries

Fonts

Tag Managers

Advertising

Web Servers

Languages

SEO Analysis

D58/100

siu.edusiu.edu

Southern Illinois University

Southern Illinois University is the right place for your college experience: in Carbondale, Illinois, SIU offers everything you need, plus extras that inspire.

Title Length28 chars

Recommended: 50-60 chars

Description Length159 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (21/27)

5 issues found

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Crawlability

Sitemap

Type: standard

59 URLs

robots.txt

32 rules

Sponsored

Security Score

21%Critical

Interactive

HTTPS

No WAF

324d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Internet2

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

07.01.2026

Valid Until

07.01.2027

OCSP Stapling

Enabled

Subject Alternative Names (20)

siu.edu*.asa.siu.edu*.aviation.siu.edu*.business.siu.edu*.it.siu.edu*.lib.siu.edu*.oit.siu.edu*.rso.siu.edu+12 more

SHA-256 Fingerprint

3C:02:27:42:DB:A8:85:72:07:1B:AE:36:16:49:64:56:FF:52:37:F5...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

access-control-allow-origin

connection

Keep-Alive

content-encoding

📦 Gzip(gzip)

content-length

9016

content-type

text/html; charset=UTF-8

date

Tue, 17 Feb 2026 01:58:03 GMT

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

siu-edu.mail.protection.outlook.com

Domain Information

siu.edu

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

Arial

63/100

Readability

/30

25/40

18px · LH 1.17

Hierarchy

/20

13/25

1.96x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Arial

Sans36px

Body Font

Arial

Sans18px

Contrast Ratio

Reading Comfort

~41 CPL

Needs attention

36px

27px

21px

18px

✅ Excellent readability: 18px body text is ideal for all devices.

⚠️ Tight line spacing (1.17). Consider 1.4-1.6 for better readability.

✅ Good hierarchy: Clear distinction between headlines and 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.

✅ Smart font loading: Using font-display: swap prevents invisible text during load.

GGoogle Fonts

Business & Marketing Stack

5 Tools Detected

Enterprise

Behavior Analytics

Microsoft ClarityFree

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

LinkedIn AdsEnterprise

Ad platforms and retargeting pixels

Sponsored

Scripts & Styles

29 Resources

Scripts

Styles

Async

Defer

Top Script Sources

googletagmanager.com(6)connect.facebook.net(3)cse.google.com(2)google-analytics.com(1)scripts.clarity.ms(1)

Website Identity

Facebook Instagram YouTube TikTok

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Last analyzed: 17 Feb 2026 at 01:58

Historical Analysis & Change Tracking