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.

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treasurydirect.gov

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

Export

treasurydirect.gov

Sponsored

Hosting Provider

United States Department of the Treasury

IP Address

164.95.95.225

Server Location

🇺🇸 Ashburn, United States

ASN

AS13506

Organization

United States Department of the Treasury

CDN

Cloudflare

WAF

Cloudflare

Nameservers

tadeo.ns.cloudflare.com.margot.ns.cloudflare.com.

Performance

Page Speed

955 KB

32 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

jQuery

Styling

Tailwind CSS

Infrastructure

Hosting

United States Department of the Treasury

CDN

Cloudflare

Technology Stack

5 Technologies Detected

Analytics

Libraries

CSS Frameworks

Fonts

SEO Analysis

D41/100

treasurydirect.govtreasurydirect.gov

Home — TreasuryDirect

No description available for this page.

Title Length21 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (1)

• Missing meta description - important for click-through rates

8 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

1,897 URLs

robots.txt

Sponsored

Security Score

56%Poor

Interactive

HTTPS

No WAF

198d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Entrust Limited

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

04.08.2025

Valid Until

04.09.2026

OCSP Stapling

Enabled

Subject Alternative Names (20)

treasurydirect.govbondpro.govfederalinvestments.govfedinvest.govmobile.treasurydirect.govsavingsbond.govsavingsbonds.govsavingsbondwizard.gov+12 more

SHA-256 Fingerprint

CA:01:4A:5B:3D:8C:B9:CE:8D:21:D5:31:EB:E9:FB:21:D5:40:4D:4F...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

cache-control

🔴 No Cache(no-store)

connection

Keep-Alive

content-length

42080

content-type

text/html

date

Wed, 18 Feb 2026 05:00:07 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (2)

cwmailhub1in.treasury.gov

cemailhub1in.treasury.gov

Domain Information

treasurydirect.gov

Domain Age

27y 5m

Created

04.09.1998

Expires

08.09.2026

Last Updated

13.09.2025

Registrar

get.gov

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

Public Sans

61/100

Readability

/30

40/40

16px · LH 1.50

Hierarchy

/20

20/25

1.8x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Public Sans

Sans29px

Body Font

Public Sans

Sans16px

Contrast Ratio

Reading Comfort

~34 CPL

Needs attention

29px

48px

29px

48px

16px

Perfect Fourth

Scale

✅ Excellent readability: 16px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Good hierarchy: Clear distinction between headlines and 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.

⚠️ 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

14 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(4)dap.digitalgov.gov(2)gstatic.com(1)google.com(1)googletagmanager.com(1)

Website Identity

Facebook X (Twitter)

Sponsored

Last analyzed: 18 Feb 2026 at 04:59

Historical Analysis & Change Tracking