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

usps.com

https://usps.com· First analyzed 11 Feb 2026· Updated 11 Feb 2026

Export

usps.com

Mobile

Sponsored

Hosting Provider

United States Postal Service

IP Address

56.0.134.100

Server Location

🇺🇸 Crescent City, United States

ASN

AS5774

Organization

United States Postal Service

CDN

Akamai

WAF

Akamai

Nameservers

dns082.usps.com.dns141.usps.com.

Performance

Page Speed

2 MB

133 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

jQuery

Styling

Bootstrap

Infrastructure

Hosting

United States Postal Service

CDN

Akamai

Technology Stack

11 Technologies Detected

Advertising

LinkedIn Ads Pinterest Tag Snapchat Pixel Microsoft Advertising

CSS Frameworks

Analytics

Libraries

Other

Tag Managers

SEO Analysis

B78/100

usps.comusps.com

Welcome | USPS

Welcome to USPS.com. Track packages, pay and print postage with Click-N-Ship, schedule free package pickups, look up ZIP Codes, calculate postage prices, and...

Description truncated.

Title Length14 chars

Recommended: 50-60 chars

Description Length222 chars

Recommended: 120-160 chars

Issues (0)

3 issues found

Upgrade to view details

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Security Score

81%Very Good

Interactive

HTTPS

WAF

278d

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

access-control-allow-origin

https://www.usps.com

akamai-grn

0.be1f1602.1770791101.db947cd8

cache-control

🟡 2948s(private, max-age=2948)

content-encoding

📦 Gzip(gzip)

content-length

21232

Good Warning Issue

Typography & Readability

HelveticaNeueW02-75Bold

43/100

Readability

/30

24/40

14px · LH 1.20

Hierarchy

/20

21/25

2.29x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

HelveticaNeueW02-75Bold

Sans32px

Body Font

HelveticaNeueW02-75Bold

Sans14px

Contrast Ratio

Reading Comfort

~37 CPL

Needs attention

32px

16px

14px

⚠️ Small text: 14px may be hard to read on mobile. Consider 16px+.

✅ Strong hierarchy: Headlines are 2.3x larger than body text.

✅ Good performance: Using 2 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.

⚠️ Cramped layout: 88 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

8 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

LinkedIn AdsEnterprise

Pinterest AdsMid-Market

Microsoft AdsEnterprise

Reddit PixelMid-Market

Snapchat PixelMid-Market

Ad platforms and retargeting pixels

Sponsored

Scripts & Styles

26 Resources

Scripts

Styles

Async

Defer

Top Script Sources

usps.com(5)googletagmanager.com(3)s.pinimg.com(2)bat.bing.com(2)connect.facebook.net(2)

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Last analyzed: 11 Feb 2026 at 06:25

Historical Analysis & Change Tracking