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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epsilon.com

https://epsilon.com· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

epsilon.com

Sponsored

Hosting Provider

Epsilon Data Management LLC

IP Address

159.127.209.0

Server Location

🇺🇸 Wakefield, United States

ASN

AS19137

Organization

Epsilon Data Management LLC

CDN

CloudFront

Nameservers

a24-67.akam.net.a11-65.akam.net.a9-65.akam.net.a8-64.akam.net.+2 more

Performance

Page Speed

1.5 MB

86 requests

Image Optimization

Lazy LoadWebPResponsiveVercel Image Optimization

0–49

50–89

90–100

Architecture Stack

JAMstack

🔀 Hybrid

Decoupled

Frontend

Framework

Next.js

API

Data Source

Headless CMS

Sanity

Infrastructure

Hosting

Epsilon Data Management LLC

CDN

CloudFront

Detected API Sources

/_next/image?url=https%3A%2F%2...

Technology Stack

5 Technologies Detected

CSS Frameworks

Meta Frameworks

Analytics

Security

SEO Analysis

A+90/100

epsilon.comepsilon.com

Marketing that puts people first | Epsilon EMEA

Powering personalized marketing at scale, Epsilon helps brands connect with consumers across paid, owned, and earned channels—delivering measurable results.

Title Length47 chars

Recommended: 50-60 chars

Description Length156 chars

Recommended: 120-160 chars

Issues (0)

1 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

2,310 URLs

robots.txt

5 rules

Sitemap reference found

Sponsored

Security Score

21%Critical

Interactive

HTTPS

No WAF

284d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Amazon

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

30.10.2025

Valid Until

28.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.epsilon.comwww.epsilon.com

SHA-256 Fingerprint

4D:11:06:65:F5:19:BB:27:B4:38:60:85:F5:7D:A7:44:C7:8B:2A:B0...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

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HTTP Headers

Developer Console

alt-svc

h3=":443"; ma=86400

cache-control

🔴 No Cache(private, no-cache, no-store, max-age=0, must-revalidate)

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=utf-8

date

Tue, 17 Feb 2026 18:24:37 GMT

link

</_next/static/media/64e2475161ca677d-s.p.woff2>; rel=preloa...

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

epsilon-com.mail.protection.outlook.com

Domain Information

epsilon.com

Domain Age

30y 11m

Created

30.03.1995

Expires

31.03.2026

Last Updated

27.03.2025

Registrar

CSC Corporate Domains, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

OneTrust

Cookie Consent Banner

OneTrust

GDPR Indicators

Cookie consent banner detected

CMP: OneTrust

Data Protection Officer mentioned

Typography & Readability

__avenirNext_a94f83

80/100

Readability

/30

32/40

16px · LH 1.20

Hierarchy

/20

25/25

3.5x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

__avenirNext_a94f83

Sans56px

Body Font

__avenirNext_a94f83

Sans16px

Contrast Ratio

Reading Comfort

~34 CPL

Needs attention

56px

40px

24px

16px

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

✅ Strong hierarchy: Headlines are 3.5x 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.

✅ Protected text on images: Using gradient for readability.

Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

OneTrustEnterprise

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(18)gstatic.com(1)google.com(1)

Sponsored

Last analyzed: 17 Feb 2026 at 18:24

Historical Analysis & Change Tracking