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

si.edu

https://si.edu· First analyzed 10 Feb 2026· Updated 10 Feb 2026

Export

si.edu

Mobile

Sponsored

Hosting Provider

Smithsonian Institution

IP Address

160.111.244.22

Server Location

🇺🇸 Washington, United States

ASN

AS25829

Organization

Smithsonian Institution

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

a11-67.akam.net.a9-64.akam.net.a26-66.akam.net.a24-67.akam.net.+2 more

Performance

Page Speed

1.4 MB

77 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Drupal

Technology Stack

7 Technologies Detected

Fonts

Adobe Fonts (Typekit)Adobe Fonts

Other

CSS Frameworks

Analytics

Tag Managers

CDN

SEO Analysis

A82/100

si.edusi.edu

Smithsonian Institution | Home

Plan your visit or explore online the world's largest museum, research, and education complex.

Title Length30 chars

Recommended: 50-60 chars

Description Length94 chars

Recommended: 120-160 chars

Issues (0)

2 issues found

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Sponsored

Security Score

51%Poor

Interactive

HTTPS

WAF

68d

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

date

Tue, 10 Feb 2026 23:32:39 GMT

content-type

text/html; charset=UTF-8

cache-control

🟡 1 Hours(max-age=3600, public)

x-drupal-dynamic-cache

UNCACHEABLE (poor cacheability)

content-language

x-content-type-options

nosniff

Good Warning Issue

Typography & Readability

indivisible + sans-serif

88/100

Readability

/30

40/40

18px · LH 1.44

Hierarchy

/20

25/25

3.33x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

indivisible

Sans60px

Body Font

sans-serif

Sans18px

Contrast Ratio

Reading Comfort

~62 CPL

Optimal (45–75)

60px

40px

18px

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

✅ Optimal line spacing: 1.44 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 3.3x 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.

✅ Protected text on images: Using gradient for readability.

AAdobe Fonts Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

26 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(8)cdn.jsdelivr.net(5)static.fundraiseup.com(4)cdn.fundraiseup.com(1)googletagmanager.com(1)

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Last analyzed: 10 Feb 2026 at 23:33

Historical Analysis & Change Tracking