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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claude.ai

https://claude.ai· First analyzed 12 Feb 2026· Updated 12 Feb 2026

Export

claude.ai

Mobile

Sponsored

Hosting Provider

Anthropic, PBC

IP Address

160.79.104.10

Server Location

🇺🇸 San Francisco, United States

ASN

AS399358

Organization

Anthropic, PBC

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

isla.ns.cloudflare.com.randy.ns.cloudflare.com.

Performance

Page Speed

14 MB

117 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Hybrid

🔀 Hybrid

Frontend

Framework

Next.js

Styling

Tailwind CSS

Infrastructure

Hosting

Anthropic, PBC

CDN

Cloudflare

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

11 Technologies Detected

Meta Frameworks

Other

Other

CSS Frameworks

Tag Managers

Customer Support

CDN

Analytics

SEO Analysis

B76/100

claude.aiclaude.ai

Claude

Talk with Claude, an AI assistant from Anthropic

Title Length6 chars

Recommended: 50-60 chars

Description Length48 chars

Recommended: 120-160 chars

Issues (0)

3 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

19 rules

Sitemap reference found

Sponsored

A+

Security Score

92%Excellent

Interactive

HTTPS

WAF

64d

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

17.01.2026

Valid Until

17.04.2026

Subject Alternative Names (3)

claude.aistaging.claude.aiwww.claude.ai

SHA-256 Fingerprint

F7:32:B0:74:2A:52:91:D2:33:88:5B:56:54:B7:1E:7E:AD:A4:E0:4C...

Upgrade to view header details

HTTP Headers

Developer Console

date

Thu, 12 Feb 2026 13:32:24 GMT

content-type

text/html; charset=utf-8

cf-ray🇩🇪 Frankfurt

9ccc73a98b0612c4-FRA

server

cloudflare

content-encoding

zstd

strict-transport-security

max-age=63072000; includeSubDomains; preload

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

Domain Information

claude.ai

Domain Age

7y 6m

Created

04.08.2018

Expires

04.08.2029

Last Updated

17.01.2025

Registrar

MarkMonitor Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Cookie consent banner detected

Data Protection Officer mentioned

Typography & Readability

Georgia + system-ui

51/100

Readability

/30

12/40

12px · LH 1.33

Hierarchy

/20

18/25

3x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Georgia

Serif36px

Body Font

system-ui

Sans12px

Contrast Ratio

Reading Comfort

~50 CPL

Optimal (45–75)

36px

56px

16px

12px

❌ Critical: 12px body text is too small. Increase to at least 14px.

✅ Strong hierarchy: Headlines are 3.0x larger than body text.

✅ Good performance: Using 2 font families keeps load times fast.

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

✅ Optimal line length: ~50 characters per line is comfortable to read.

⚠️ Cramped layout: 29 elements lack adequate spacing.

Buy on MyFontsVariable Fonts

Business & Marketing Stack

3 Tools Detected

Advanced

Customer Support

IntercomMid-Market

Live chat and helpdesk tools

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

29 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(19)widget.intercom.io(1)

Website Identity

X (Twitter)Instagram

Sponsored

Last analyzed: 12 Feb 2026 at 13:32

Historical Analysis & Change Tracking