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

casper.com

https://casper.com· First analyzed 25 Apr 2026· Updated 25 Apr 2026

Export

casper.com

Mobile

Sponsored

Hosting Provider

Shopify

shopify.com

IP Address

23.227.38.65

Site Location

🇺🇸 United Statesvia phone

Server Location

🇨🇦 Ottawa, Canada

ASN

AS13335

Organization

Shopify, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

vera.ns.cloudflare.com.rick.ns.cloudflare.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

606 ms10%

Speed Index

788 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

2.6 MB

334 requests

Image Optimization

Lazy LoadWebPResponsiveThumbor

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Shopify

ecommerce

Release-26-16-042326-823Custom

Shopify Theme

Detected Apps

Yotpo ReviewsUpsell & Cross SellHotjarFacebook ChannelInstagram Shopping+1 more

Technology Stack

15 Technologies Detected

Analytics

CSS Frameworks

Advertising

Google Ads Snapchat Pixel

UI Components

Tag Managers

Reviews

Payments

CDN

Customer Support

Security

SEO Analysis

B76/100

Meta Tags15/15

Content3/12

Headings7/8

Technical23/25

E-E-A-T2/7

Images7/7

Links5/5

URL5/5

Social5/5

Freshness0/4

Mobile1/4

Indexability3/3

casper.comcasper.com

The Best Bed for Better Sleep | Casper Online Mattress Store

Discover award-winning mattresses built for cooler, deeper sleep and lasting support. Shop Casper with free shipping & returns.

Title Length60 chars

Recommended: 50-60 chars (~368px / 580px)

Description Length127 chars

Recommended: 120-160 chars

Issues (1)

• Very thin content (11 words). Search engines need substantial content for ranking.

4 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

4 URLs

4 sub-sitemaps

robots.txt

162 rules

Sitemap reference found

Local SEO

Local Search Readiness

27/100

Needs Work

8 10

Sponsored

AI & LLM Readiness

D40/100

Bot Access

20/25

Machine Read.

1/25

Schema Data

12/25

Citation

7/25

AI Bot Access

14/14 accessible

AI Search

OAI-SearchBot

PerplexityBot

Claude-SearchBot

Gemini-Deep-Research

DuckAssistBot

Training

GPTBot

ClaudeBot

Google-Extended

Meta-ExternalAgent

Bytespiderinfo

Amazonbot

Applebot-Extended

CCBotinfo

Fetch

ChatGPT-User

Machine Readability

llms.txt

llms-full.txt

Semantic HTML

Heading Hierarchy

Text ratio:2%

Words:3,060

Token eff.:Poor Structure

Structured Data

4 JSON-LD

FAQPage×1.5Organization×1.1WebSiteBreadcrumbListSearchAction

Citation Readiness

Opening Summary

Descriptive Headings

Canonical URL

Open Graph3/3

Twitter Card3/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (12)

AI readiness recommendation preview...

Upgrade to view recommendations

Sponsored

Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.

83/100

Passed

Critical

Warnings

Images & Alt Text

20/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

12/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

15/15

Verifies form fields have labels, error messages are clear, and inputs are properly associated.

Color & Contrast

15/15

Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.

Keyboard & Focus

15/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

6/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

1 recommendation

•Accessibility recommendation preview...

Upgrade to view recommendations

Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.

58/100

271 mg

CO₂e / view

2.6 MB

Page Weight

30%

Cleaner Than

New Visitor

310 mg

Returning (cached)

155 mg

Annual (10K/mo)

32.5 kg

Emission Segments

Data Center

13 mg

Network

80 mg

Device

178 mg

Resource Breakdown

JavaScript

1.4 MB

Images

656.2 KB

CSS

168.1 KB

Fonts

35.8 KB

HTML

112.7 KB

Other

252.3 KB

Green Hosting Verified

Cloudflare

GWF Verified

6 recommendations

•Carbon footprint recommendation preview...

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Security Score

81%Very Good

Interactive

HTTPS

WAF

74d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

10.04.2026

Valid Until

09.07.2026

Subject Alternative Names (1)

casper.com

SHA-256 Fingerprint

A0:D3:3A:A3:C9:E0:2E:64:BC:F8:6B:EE:BB:1A:FA:38:34:BF:9A:3C...

Upgrade to view header details

HTTP Headers

Developer Console

alt-svc

h3=":443"; ma=86400

cf-cache-status

DYNAMIC

cf-ray🇮🇹 Milan

9f1c53b26b8bee8c-MXP

content-encoding

⚡ Brotli(br)

content-language

en-US

content-length

115145

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (5)

aspmx3.googlemail.com

alt2.aspmx.l.google.com

aspmx.l.google.com

alt1.aspmx.l.google.com

+1 more

Domain Information

casper.com

Domain Age

30y 11m

Created

03.06.1995

Expires

02.06.2026

Last Updated

02.06.2025

Registrar

NameCheap, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Data Protection Officer mentioned

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.

54/100

Not Mobile Friendly98 breakpoints

Viewport Meta

The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.

Responsive Design

Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.

Touch Icons

Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.

Readable Font Size

Base font size should be at least 16px on mobile to ensure text is readable without zooming.

Relative Units

Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.

No H-Scroll Risk

No elements wider than the viewport that would cause horizontal scrolling on mobile devices.

Tap Targets OK

Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.

No Fixed Widths

No elements with fixed pixel widths that could overflow on smaller screens and break the layout.

3 recommendations

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

NewKansas-Medium + Calibre

WCAG AA

65/100

Readability

/30

22/30

18px · LH 1.60

Hierarchy

/20

9/20

1x ratio

WCAG

/25

20/25

5.1:1 min contrast

Performance

/25

14/25

3 fonts · 5 req

Heading Font

NewKansas-Medium

Sans18px

Body Font

Calibre

Sans18px

Contrast Ratio

5.1:1

WCAG AA (≥4.5:1)

Reading Comfort

~34 CPL

Narrow lines

18px

56px

72px

18px

Golden Ratio

Scale

✅ Excellent readability: 18px body text is ideal for all devices.

✅ Optimal line spacing: 1.60 ratio (ideal range 1.4–1.6).

✅ WCAG AA contrast: All text meets 4.5:1 ratio (min 5.1:1).

⚠️ Minor heading issue: 1 level skip(s) detected. Maintain sequential order for screen readers.

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

⚠️ Fluid type without rem: clamp() detected but missing rem units. May fail WCAG 1.4.4 zoom test.

Buy on MyFontsFluid TypeFlesch 63

Color Palette

9 unique colors

5:1 AA Light

#ffffff

Primary· 20.1%

#706f71

Other· 4.3%

#bdd0f1

Accent· 25.599999999999998%

#3c3550

Secondary· 12.4%

#c5cad4

Secondary· 2.6%

#e8edf2

Secondary· 1.9%

Business & Marketing Stack

8 Tools Detected

Enterprise

Behavior Analytics

Google AnalyticsFree

HotjarMid-Market

Google Tag ManagerFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

Pinterest AdsMid-Market

Snapchat PixelMid-Market

Ad platforms and retargeting pixels

Privacy & Cookies

CookiebotMid-Market

Cookie consent and privacy compliance tools

Reviews & Social Proof

YotpoMid-Market

Customer reviews and testimonials

Sponsored

Scripts & Styles

24 Resources

Scripts

Styles

Async

Defer

Top Script Sources

googletagmanager.com(2)cdn.shopify.com(2)s.pinimg.com(2)connect.facebook.net(2)cdn.attn.tv(1)

Website Identity

Casper Sleep

Organization

Get the sleep you've always dreamed of. Casper's award-winning mattresses, sheets & more are quality-crafted and ethically built in the USA.

support@casper.com

+18884980003

30 years old

Location detected: 🇺🇸 United Statesvia phone

NameCheap, Inc.📧 Google Workspaceen

Social Profiles

Facebook X (Twitter)Instagram LinkedIn YouTube Pinterest Threads

Sponsored

Last analyzed: 25 Apr 2026 at 09:30

Historical Analysis & Change Tracking