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

addthis.com

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

Export

addthis.com

Mobile

Sponsored

Hosting Provider

Akamai Technologies, Inc.

IP Address

104.126.37.160

Server Location

🇩🇪 Frankfurt am Main, Germany

ASN

AS20940

Organization

Akamai Technologies, Inc.

Server

AkamaiGHost

Nameservers

a18-67.akam.net.a13-65.akam.net.a1-160.akam.net.a11-66.akam.net.

Performance

Page Speed

1 KB

1 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Akamai Technologies, Inc.

Technology Stack

1 Technologies Detected

CDN

Akamai

SEO Analysis

F5/100

addthis.comaddthis.com

fw_error_www

No description available for this page.

Title Length12 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (4)

• Missing meta description - important for click-through rates
• Missing H1 tag - every page should have one H1
• Many images missing alt text (1/1)

9 issues found

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Sponsored

Security Score

66%Fair

Interactive

HTTPS

WAF

361d

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

actual-object-ttl

-1

akamai-grn

0.07fc733e.1770773436.27c7e2e8

akamai-request-bc

[a=62.115.252.7,b=667411176,c=g,n=FI__HELSINKI,o=1299]

cache-control

🔴 No Cache(no-cache, no-store, must-revalidate, max-age=1800)

content-length

1449

content-security-policy

frame-ancestors 'self' https://my.oracle.com https://eeho.fa...

Good Warning Issue

Typography & Readability

Times New Roman

64/100

Readability

/30

30/40

16px · LH --

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Times New Roman

Body Font

Times New Roman

Serif16px

Contrast Ratio

Reading Comfort

~50 CPL

Optimal (45–75)

16px

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

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

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

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Website Identity

addthis.com

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Last analyzed: 11 Feb 2026 at 01:30

Historical Analysis & Change Tracking