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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invaluable.com

https://invaluable.com· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

invaluable.com

Mobile

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

3.149.67.236

Server Location

🇺🇸 Dublin, United States

ASN

AS16509

Organization

AWS EC2 (us-east-2)

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

ns-1563.awsdns-03.co.uk.ns-493.awsdns-61.com.ns-904.awsdns-49.net.ns-1229.awsdns-25.org.

Performance

Page Speed

1.2 MB

125 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Bootstrap

Infrastructure

Hosting

Amazon Web Services (AWS)

CDN

Cloudflare

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

15 Technologies Detected

Analytics

Google Analytics

Google Analytics 4

Heap Analytics Heap

UI Components

Swiper Slick Carousel

CSS Frameworks

Frameworks

Icon Libraries

Fonts

Adobe Fonts (Typekit)

Tag Managers

Reviews

Payments

CDN

SEO Analysis

A82/100

invaluable.cominvaluable.com

The World's Premier Online Auctions | Invaluable.com

Bid online in live auctions from all over the world. Browse fine and decorative art, antiques, estate jewelry, coins and stamps, collectibles, and more!

Title Length52 chars

Recommended: 50-60 chars

Description Length152 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (69/95)

2 issues found

Upgrade to view details

Sponsored

Security Score

50%Poor

Critical / Transactional

HTTPS

WAF

69d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

27.01.2026

Valid Until

27.04.2026

OCSP Stapling

Enabled

Subject Alternative Names (1)

www.invaluable.com

SHA-256 Fingerprint

CB:47:C2:FC:87:76:09:60:AA:4D:67:04:DB:51:B3:07:D0:05:09:52...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

date

Tue, 17 Feb 2026 03:46:04 GMT

content-type

text/html; charset=utf-8

content-encoding

📦 Gzip(gzip)

cf-ray🇩🇪 Frankfurt

9cf24ba66cd665b9-FRA

cf-cache-status

DYNAMIC

set-cookie

searchbar

Good Warning Issue

Email Infrastructure

Mimecast

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (2)

us-smtp-inbound-1.mimecast.com

us-smtp-inbound-2.mimecast.com

Domain Information

invaluable.com

Domain Age

27y 4m

Created

08.10.1998

Expires

07.10.2030

Last Updated

07.10.2020

Registrar

Network Solutions, LLC

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Legitimate interest basis mentioned

Typography & Readability

Georgia + sans-serif

75/100

Readability

/30

32/40

15px · LH 1.60

Hierarchy

/20

21/25

2x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

17/20

System fonts

Heading Font

Georgia

Serif30px

Body Font

sans-serif

Sans15px

Contrast Ratio

Reading Comfort

~94 CPL

Needs attention

30px

18px

16px

15px

⚠️ Small text: 15px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.60 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.0x larger than body text.

✅ Excellent performance: System fonts eliminate font loading delays (better LCP).

⚠️ Wide lines: ~94 chars/line. Consider max-width for better reading flow.

⚠️ Cramped layout: 25 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

5 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

HeapMid-Market

User behavior and product analytics

Privacy & Cookies

CookiebotMid-Market

Cookie consent and privacy compliance tools

Reviews & Social Proof

YotpoMid-Market

Customer reviews and testimonials

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(6)consent.cookiebot.com(2)googletagmanager.com(2)staticw2.yotpo.com(2)consentcdn.cookiebot.com(1)

Website Identity

Facebook X (Twitter)Instagram Pinterest

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Last analyzed: 17 Feb 2026 at 03:46

Historical Analysis & Change Tracking