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

gpo.gov

https://gpo.gov· First analyzed 12 Feb 2026· Updated 12 Feb 2026

Export

gpo.gov

Mobile

Sponsored

Hosting Provider

U.S. Government Publishing Office

IP Address

162.140.14.82

Server Location

🇺🇸 Capitol Heights, United States

ASN

AS3705

Organization

U.S. Government Publishing Office

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

ns2.gpo.gov.ns1.gpo.gov.

Performance

Page Speed

2.5 MB

36 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

jQuery

Styling

Bootstrap

CMS

Sitefinity

Infrastructure

Hosting

U.S. Government Publishing Office

CDN

Cloudflare

Technology Stack

9 Technologies Detected

CSS Frameworks

Analytics

Libraries

Icon Libraries

Fonts

Tag Managers

CDN

SEO Analysis

D52/100

gpo.govgpo.gov

U.S. Government Publishing Office

No description available for this page.

Title Length33 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (1)

• Missing meta description - important for click-through rates

6 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

robots.txt

3 rules

Sitemap reference found

Allows all crawlers

Sponsored

Security Score

86%Very Good

Interactive

HTTPS

WAF

377d

Certificate Details

Type

Extended Validation (EV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

05.02.2026

Valid Until

24.02.2027

OCSP Stapling

Enabled

Subject Alternative Names (20)

www.gpo.govgovinfo.govwww.govinfo.govgpo.govm.gpo.govfdsys.govwww.fdsys.govapi.fdsys.gov+12 more

SHA-256 Fingerprint

0A:0C:02:64:A1:6E:BA:04:30:C2:C3:56:42:F4:03:1F:1D:F0:36:6A...

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🟡 60s(private, max-age=60)

cf-cache-status

DYNAMIC

cf-ray🇩🇪 Frankfurt

9ccc0f84ceb9d286-FRA

content-encoding

📦 Gzip(gzip)

content-security-policy

default-src 'self'; script-src 'self' 'unsafe-inline' 'unsaf...

content-type

text/html; charset=utf-8

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

100

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

gpo-gov.mail.protection.outlook.com

Domain Information

gpo.gov

Domain Age

28y 4m

Created

02.10.1997

Expires

22.07.2026

Last Updated

27.07.2025

Registrar

get.gov

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

IBM Plex Serif + Arial

65/100

Readability

/30

40/40

21px · LH 1.40

Hierarchy

/20

20/25

1.52x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

IBM Plex Serif

Serif32px

Body Font

Arial

Sans21px

Contrast Ratio

Reading Comfort

~41 CPL

Needs attention

32px

26px

18px

21px

✅ Excellent readability: 21px body text is ideal for all devices.

✅ Optimal line spacing: 1.40 ratio ensures comfortable reading.

✅ Good hierarchy: Clear distinction between headlines and body text.

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

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

⚠️ Risky: Text appears on background images without overlay protection.

GGoogle Fonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

22 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(7)googletagmanager.com(3)cdnjs.cloudflare.com(2)

Website Identity

Facebook X (Twitter)Instagram LinkedIn YouTube Pinterest

Sponsored

Last analyzed: 12 Feb 2026 at 12:24

Historical Analysis & Change Tracking