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

criteo.com

https://criteo.com· First analyzed 13 Feb 2026· Updated 13 Feb 2026

Export

criteo.com

Mobile

Sponsored

Hosting Provider

Pantheon

pantheon.io

IP Address

23.185.0.4

Server Location

🇺🇸 San Francisco, United States

ASN

AS54113

Organization

Pantheon

Server

Nginx

CDN

Fastly

Nameservers

ns2.criteo.com.ns1.criteo.com.

Performance

Page Speed

3.1 MB

125 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPress

cms

Criteo2017v0.6.2

by Holger Koenemann

View Theme

Technology Stack

16 Technologies Detected

Plugins

Tablepress Responsive Tables

Rw Quick Page And Post Redirects Motionpage

CSS Frameworks

Analytics

Libraries

Other

UI Components

Icon Libraries

Tag Managers

Advertising

Web Servers

Customer Support

SEO Analysis

A88/100

criteo.comcriteo.com

The Commerce Media Platform for the Open Internet | Criteo

Activate the world’s largest set of commerce data to bring richer experiences to consumers with our Commerce Media Platform

Title Length58 chars

Recommended: 50-60 chars

Description Length123 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (41/46)

1 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

9 URLs

robots.txt

61 rules

Sitemap reference found

Sponsored

Security Score

56%Poor

Interactive

HTTPS

No WAF

56d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

10.01.2026

Valid Until

10.04.2026

Subject Alternative Names (7)

criteo.comfuture.criteo.comgo.criteo.comstoretail.comwww.criteo.comwww.hooklogic.comwww.storetail.com

SHA-256 Fingerprint

FB:51:AB:5A:21:E1:44:6C:4A:4C:90:90:D2:EB:F4:84:F4:5D:51:3B...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

age

48443

cache-control

🔵 1 Days(public, max-age=86400)

content-encoding

📦 Gzip(gzip)

content-length

83587

content-security-policy

script-src * 'unsafe-inline' 'unsafe-eval';

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (2)

criteo-com.o-v1.mx.microsoft

criteo-com.mail.protection.outlook.com

Domain Information

criteo.com

Domain Age

20y 8m

Created

17.06.2005

Expires

17.06.2035

Last Updated

20.08.2025

Registrar

Gandi SAS

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Data Protection Officer mentioned

Typography & Readability

Graphik LC Web

76/100

Readability

/30

32/40

18px · LH 1.30

Hierarchy

/20

21/25

3.33x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Graphik LC Web

Sans60px

Body Font

Graphik LC Web

Sans18px

Contrast Ratio

Reading Comfort

~36 CPL

Needs attention

60px

45px

18px

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

✅ Strong hierarchy: Headlines are 3.3x larger than body text.

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

✅ Consistent design: Single font family with weight variations is a modern best practice.

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

✅ Protected text on images: Using gradient for readability.

Buy on MyFonts

Business & Marketing Stack

4 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

AmplitudeMid-Market

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

CookiebotMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

27 Resources

Scripts

Styles

Async

Defer

Top Script Sources

web.cmp.usercentrics.eu(7)criteo.com(6)cdn.drda.io(1)www2.criteo.com(1)cdn.eu.amplitude.com(1)

Website Identity

criteo.com

20 years old

Gandi SAS📧 Microsoft 365

Social Profiles

Facebook X (Twitter)LinkedIn YouTube

Sponsored

Last analyzed: 13 Feb 2026 at 11:45

Historical Analysis & Change Tracking