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

section508.gov

https://section508.gov· First analyzed 18 Feb 2026· Updated 18 Feb 2026

Export

section508.gov

Sponsored

Hosting Provider

General Services Administration

IP Address

159.142.191.107

Server Location

🇺🇸 Washington, United States

ASN

AS16524

Organization

General Services Administration

CDN

CloudFront

Nameservers

dns.gsa.gov.dns4.gsa.gov.dns3.gsa.gov.dns5.gsa.gov.+1 more

Performance

Page Speed

7.9 MB

39 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

General Services Administration

CDN

CloudFront

Progressive Web App

Web ManifestApple Touch Icon

Technology Stack

4 Technologies Detected

Analytics

Libraries

CSS Frameworks

SEO Analysis

A80/100

section508.govsection508.gov

Home | Section508.gov

Section508.gov is the official U.S. government resource for ensuring digital accessibility compliance with Section 508 of the Rehabilitation Act (29 U.S.C. 7...

Description truncated.

Title Length21 chars

Recommended: 50-60 chars

Description Length353 chars

Recommended: 120-160 chars

Issues (0)

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

573 URLs

robots.txt

1 rules

Sitemap reference found

Allows all crawlers

Sponsored

Security Score

56%Poor

Interactive

HTTPS

No WAF

65d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

24.01.2026

Valid Until

24.04.2026

Subject Alternative Names (1)

www.section508.gov

SHA-256 Fingerprint

3E:82:E5:0B:D3:51:71:87:A0:05:49:24:26:63:55:48:8D:8E:43:B6...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

access-control-allow-methods

GET, HEAD

age

cache-control

🟡 60s(max-age=60)

content-encoding

📦 Gzip(gzip)

content-length

7009

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

Domain Information

section508.gov

Domain Age

26y 1m

Created

13.01.2000

Expires

08.09.2026

Last Updated

06.11.2025

Registrar

get.gov

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

Public Sans Web

38/100

Readability

/30

12/40

12px · LH 1.20

Hierarchy

/20

25/25

2.67x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Public Sans Web

Sans32px

Body Font

Public Sans Web

Sans12px

Contrast Ratio

Reading Comfort

~37 CPL

Needs attention

32px

31px

12px

Minor Second

Scale

❌ Critical: 12px body text is too small. Increase to at least 14px.

✅ Strong hierarchy: Headlines are 2.7x 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.

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

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

Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

Google Tag ManagerFree

User behavior and product analytics

Sponsored

Scripts & Styles

8 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(3)dap.digitalgov.gov(2)code.jquery.com(1)googletagmanager.com(1)

Website Identity

GitHub

Sponsored

Last analyzed: 18 Feb 2026 at 02:47

Historical Analysis & Change Tracking