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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icloud.com

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

Export

icloud.com

Mobile

Sponsored

Hosting Provider

Apple Inc

IP Address

17.253.144.10

Server Location

🇺🇸 Cupertino, United States

ASN

AS714

Organization

Apple Inc

Server

AppleHttpServer/a3fb6e96e80a

Nameservers

b.ns.apple.com.c.ns.apple.com.d.ns.apple.com.a.ns.apple.com.

Performance

Page Speed

713 KB

11 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

🖥️ CSR

Infrastructure

Hosting

Apple Inc

Technology Stack

1 Technologies Detected

CSS Frameworks

Tailwind CSS

SEO Analysis

F29/100

icloud.comicloud.com

iCloud

Log in to iCloud to access your photos, mail, notes, documents and more. Sign in with your Apple Account or create a new account to start using Apple services.

Title Length6 chars

Recommended: 50-60 chars

Description Length159 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag - every page should have one H1
• Many images missing alt text (1/1)

6 issues found

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Sponsored

Security Score

76%Good

Interactive

HTTPS

No WAF

48d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Apple Inc.

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

25.09.2025

Valid Until

31.03.2026

OCSP Stapling

Enabled

Subject Alternative Names (5)

www.icloud.comicloud.comicloud.cdn-apple.comauth.apple.comwww.icloud.com.cn

SHA-256 Fingerprint

22:38:E7:8E:6A:01:60:F9:A6:77:D2:C0:4F:3B:A9:8A:74:53:8D:B4...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

access-control-expose-headers

X-Apple-Request-UUID,Via

cache-control

🟡 300s(public, max-age=300)

content-encoding

⚡ Brotli(br)

content-language

en-gb

content-length

9305

content-location

/system/icloud.com/index.html.en-gb.br

Good Warning Issue

Email Infrastructure

iCloud Mail

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (2)

mx02.mail.icloud.com

mx01.mail.icloud.com

Typography & Readability

SF Pro Text + Helvetica Neue

68/100

Readability

/30

32/40

17px · LH 1.20

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

SF Pro Text

Body Font

Helvetica Neue

Sans17px

Contrast Ratio

Reading Comfort

Mixed Pairing

left aligned

✅ Excellent readability: 17px body text is ideal for all devices.

✅ Good performance: Using 1 font families keeps load times fast.

✅ Smart font loading: Using font-display: swap prevents invisible text during load.

✅ Clean layout: Consistent left alignment throughout.

Buy on MyFonts

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

4 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(1)

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Last analyzed: 11 Feb 2026 at 11:09

Historical Analysis & Change Tracking