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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sherwin-williams.com

https://sherwin-williams.com· First analyzed 14 Feb 2026· Updated 14 Feb 2026

Export

Mobile

Sponsored

Hosting Provider

Sherwin Williams Company

IP Address

148.141.109.36

Server Location

🇺🇸 Cleveland, United States

ASN

AS18844

Organization

Sherwin Williams Company

Server

volt-adc

Nameservers

ns2.f5clouddns.com.ns1.f5clouddns.com.

Performance

Page Speed

6.3 MB

99 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Headless

⚙️ SSR

Decoupled

API

Data Source

Headless CMS

Strapi

Infrastructure

Hosting

Sherwin Williams Company

Detected API Sources

https://maps.googleapis.com/ma...

Technology Stack

6 Technologies Detected

CSS Frameworks

Analytics

Tag Managers

Advertising

SEO Analysis

C61/100

sherwin-williams.comsherwin-williams.com

Sherwin-Williams Paints, Stains, Supplies and Coating Solutions

Discover the possibilities of Sherwin-Williams® paint with over 1700 paint colors. Get paint color tips, project ideas & product advice for DIY and Pros.

Title Length63 chars

Recommended: 50-60 chars

Description Length153 chars

Recommended: 120-160 chars

Issues (0)

6 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

1,318 URLs

robots.txt

86 rules

Sitemap reference found

Sponsored

A+

Security Score

96%Excellent

Static / Informational

HTTPS

No WAF

38d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Inc

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

SHA-384 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

07.03.2025

Valid Until

24.03.2026

OCSP Stapling

Enabled

Subject Alternative Names (5)

sherwin-williams.comwww.colorsnap.comwww.sherwin-williams.comwww.swcolorforecast.comwww.SWColorID.com

SHA-256 Fingerprint

5A:C4:F5:9A:F6:F5:BB:F3:5B:E3:3E:7A:07:6F:C4:22:35:45:95:57...

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

cache-control

🟡 2845s(public, max-age=2845)

content-encoding

📦 Gzip(gzip)

content-length

48082

content-security-policy

frame-ancestors https://blog.sherwin-williams.com https://ww...

content-type

text/html;charset=utf-8

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (6)

emhost61.sherwin.com

emhost62.sherwin.com

emhost60.sherwin.com

emhost64.sherwin.com

+2 more

Domain Information

sherwin-williams.com

Domain Age

28y 1m

Created

06.01.1998

Expires

05.01.2027

Last Updated

06.12.2025

Registrar

GoDaddy Corporate Domains, LLC

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

Open Sans + sans-serif

36/100

Readability

/30

25/40

16px · LH 1.13

Hierarchy

/20

8/25

1.25x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Open Sans

Sans20px

Body Font

sans-serif

Sans16px

Contrast Ratio

Reading Comfort

~35 CPL

Needs attention

20px

12px

36px

16px

Minor Third

Scale

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

⚠️ Tight line spacing (1.12). Consider 1.4-1.6 for better readability.

⚠️ Weak hierarchy: Headlines should be at least 2x body size for clear visual structure.

✅ Good performance: Using 2 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.

Buy on MyFonts

Business & Marketing Stack

6 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

Pinterest AdsMid-Market

TikTok PixelMid-Market

Reddit PixelMid-Market

Ad platforms and retargeting pixels

Sponsored

Scripts & Styles

29 Resources

Scripts

Styles

Async

Defer

Top Script Sources

https:(9)nexus.ensighten.com(5)googletagmanager.com(4)assets.adobedtm.com(1)cdn.gbqofs.com(1)

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Last analyzed: 14 Feb 2026 at 10:22

Historical Analysis & Change Tracking