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

ushmm.org

https://ushmm.org· First analyzed 12 Feb 2026· Updated 12 Feb 2026

Export

ushmm.org

Mobile

Sponsored

Hosting Provider

Comcast Cable Communications

IP Address

50.144.202.30

Server Location

🇺🇸 Washington, United States

ASN

AS33738

Organization

Comcast Cable Communications

CDN

CloudFront

Nameservers

edns2.ultradns.org.edns2.ultradns.biz.edns2.ultradns.com.edns2.ultradns.net.

Performance

Page Speed

2 MB

127 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Hybrid

⚙️ SSR

Frontend

Framework

Nuxt.js

Infrastructure

Hosting

Comcast Cable Communications

CDN

CloudFront

Technology Stack

9 Technologies Detected

Analytics

Meta Frameworks

CSS Frameworks

Tag Managers

Advertising

Microsoft Advertising

SEO Analysis

C68/100

ushmm.orgushmm.org

United States Holocaust Memorial Museum

A living memorial to the Holocaust, the United States Holocaust Memorial Museum inspires citizens and leaders worldwide to confront hatred, prevent genocide,...

Description truncated.

Title Length39 chars

Recommended: 50-60 chars

Description Length184 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (17/19)

4 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

3 rules

Sponsored

Security Score

66%Fair

Interactive

HTTPS

WAF

10d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

SSL Corporation

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

28.01.2025

Valid Until

23.02.2026

OCSP Stapling

Enabled

Subject Alternative Names (19)

*.ushmm.orgushmm.orgsecure.ushmm.orgsupport.ushmm.orgtechhelp.ushmm.orgcrm.ushmm.orgvpn.ushmm.orgpavpn.ushmm.org+11 more

SHA-256 Fingerprint

55:D6:4C:62:41:F6:AD:75:A1:03:E1:38:EF:26:B5:B3:DC:B1:FE:A9...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🟡 600s(max-age=600, stale-while-revalidate=600)

content-encoding

⚡ Brotli(br)

content-security-policy

frame-ancestors 'self' https://*.contentful.com https://*.us...

content-type

text/html;charset=utf-8

date

Thu, 12 Feb 2026 22:15:26 GMT

referrer-policy

strict-origin-when-cross-origin

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (5)

alt3.aspmx.l.google.com

aspmx.l.google.com

alt2.aspmx.l.google.com

alt1.aspmx.l.google.com

+1 more

Domain Information

ushmm.org

Domain Age

32y 3m

Created

28.10.1993

Expires

27.10.2026

Last Updated

02.09.2021

Registrar

Network Solutions, LLC

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

Knockout 50 A + Mercury SSm A

83/100

Readability

/30

40/40

19px · LH 1.43

Hierarchy

/20

18/25

3.33x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

17/20

System fonts

Heading Font

Knockout 50 A

Sans64px

Body Font

Mercury SSm A

Sans19px

Contrast Ratio

Reading Comfort

~33 CPL

Needs attention

64px

20px

19px

✅ Excellent readability: 19px body text is ideal for all devices.

✅ Optimal line spacing: 1.43 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 3.3x larger than body text.

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

✅ 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

6 Tools Detected

Enterprise

Marketing Automation

MarketoEnterprise

Email marketing and automation platforms

Behavior Analytics

HotjarMid-Market

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

Microsoft AdsEnterprise

Ad platforms and retargeting pixels

Sponsored

Scripts & Styles

28 Resources

Scripts

Styles

Async

Defer

Top Script Sources

googletagmanager.com(3)munchkin.marketo.net(2)google-analytics.com(2)connect.facebook.net(2)bat.bing.com(2)

Website Identity

Facebook X (Twitter)Instagram TikTok

Sponsored

Last analyzed: 12 Feb 2026 at 22:16

Historical Analysis & Change Tracking