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

nga.gov

https://nga.gov· First analyzed 13 Feb 2026· Updated 13 Feb 2026

Export

nga.gov

Mobile

Sponsored

Hosting Provider

National Gallery of Art

IP Address

199.16.64.40

Server Location

🇺🇸 Alexandria, United States

ASN

AS54521

Organization

National Gallery of Art

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

auth1.dns.rcn.net.auth2.dns.rcn.net.auth4.dns.rcn.net.auth3.dns.rcn.net.

Performance

Page Speed

2 MB

51 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Drupal

Progressive Web App

Web ManifestApple Touch Icon

Technology Stack

9 Technologies Detected

Analytics

Google Analytics

Google Analytics 4

Facebook Pixel Mouseflow

Libraries

CSS Frameworks

Tag Managers

Email Marketing

CDN

SEO Analysis

B72/100

nga.govnga.gov

National Gallery of Art

The National Gallery of Art serves the nation by welcoming all people to explore and experience art, creativity, and our shared humanity. Admission is always...

Description truncated.

Title Length23 chars

Recommended: 50-60 chars

Description Length163 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (30/53)

3 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

61 rules

Sitemap reference found

Sponsored

Security Score

81%Very Good

Interactive

HTTPS

WAF

51d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

05.01.2026

Valid Until

05.04.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

nga.gov*.nga.gov

SHA-256 Fingerprint

D9:13:EF:67:CC:0E:7A:C2:55:54:C2:EE:F7:72:39:E2:E6:3D:22:DE...

Upgrade to view header details

HTTP Headers

Developer Console

age

401

cache-control

🔴 No Cache(max-age=89523, public, no-store)

cf-cache-status

HIT

cf-ray🇩🇪 Frankfurt

9cd64f384dd6b18f-FRA

content-encoding

📦 Gzip(gzip)

content-language

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

nga-gov.mail.protection.outlook.com

Domain Information

nga.gov

Domain Age

28y 4m

Created

02.10.1997

Expires

30.09.2025

Last Updated

08.01.2024

Registrar

get.gov

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

Mallory

71/100

Readability

/30

40/40

18px · LH 1.50

Hierarchy

/20

8/25

1.22x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Mallory

Sans22px

Body Font

Mallory

Sans18px

Contrast Ratio

Reading Comfort

~41 CPL

Needs attention

22px

28px

16px

18px

Minor Second

Scale

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

⚠️ Weak hierarchy: Headlines should be at least 2x body size for clear visual structure.

✅ Good performance: Using 2 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

5 Tools Detected

Enterprise

Marketing Automation

MailchimpSMB

Email marketing and automation platforms

Behavior Analytics

MouseflowSMB

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

Ad platforms and retargeting pixels

Sponsored

Scripts & Styles

15 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(4)googletagmanager.com(3)connect.facebook.net(2)cdn.mouseflow.com(1)unpkg.com(1)

Website Identity

Facebook X (Twitter)Instagram YouTube Pinterest

Sponsored

Last analyzed: 13 Feb 2026 at 18:15

Historical Analysis & Change Tracking