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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challenges.fr

https://challenges.fr· First analyzed 16 Feb 2026· Updated 16 Feb 2026

Export

challenges.fr

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

13.33.235.14

Server Location

🇺🇸 New York, United States

ASN

AS16509

Organization

AWS CloudFront (GLOBAL)

Server

CloudFront

CDN

CloudFront

Nameservers

ns-1379.awsdns-44.org.ns-161.awsdns-20.com.ns-1645.awsdns-13.co.uk.ns-660.awsdns-18.net.

Performance

Page Speed

217 KB

128 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Hybrid

⚙️ SSR

Frontend

Framework

Nuxt.js

Styling

Tailwind CSS

Infrastructure

Hosting

Amazon Web Services (AWS)

CDN

CloudFront

Technology Stack

10 Technologies Detected

Analytics

Meta Frameworks

CSS Frameworks

Fonts

Tag Managers

CDN

SEO Analysis

B76/100

challenges.frchallenges.fr

Challenges, l’actualité de l’économie

Toute l'actualité de l'économie, de la finance, de l'entreprise et de l'immobilier sur Challenges.fr

Title Length37 chars

Recommended: 50-60 chars

Description Length100 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag - every page should have one H1

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

48 rules

Sitemap reference found

Sponsored

Security Score

71%Good

Static / Informational

HTTPS

No WAF

302d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Amazon

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

16.11.2025

Valid Until

15.12.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

challenges.fr*.challenges.fr

SHA-256 Fingerprint

6B:0A:68:40:2E:68:08:34:94:C4:30:8D:4E:17:4A:D7:2C:9A:DA:B3...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

age

373

alt-svc

h3=":443"; ma=86400

content-encoding

📦 Gzip(gzip)

content-length

114396

content-type

text/html;charset=utf-8

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (2)

mx1.sfagroup.com

mx2.sfagroup.com

Domain Information

challenges.fr

Domain Age

25y 11m

Created

29.02.2000

Expires

08.09.2026

Last Updated

31.10.2025

Registrar

AURIC

DNSSEC

Not Enabled

Privacy & Compliance

Didomi

Cookie Consent Banner

Didomi

GDPR Indicators

Cookie consent banner detected

CMP: Didomi

Typography & Readability

ui-sans-serif + IBM Plex Sans

59/100

Readability

/30

24/40

15px · LH 1.30

Hierarchy

/20

8/25

0.93x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

17/20

System fonts

Heading Font

ui-sans-serif

Sans14px

Body Font

IBM Plex Sans

Sans15px

Contrast Ratio

Reading Comfort

~36 CPL

Needs attention

14px

16px

20px

16px

15px

Minor Second

Scale

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

⚠️ Weak hierarchy: Headlines should be at least 2x body size for clear visual structure.

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

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

✅ Protected text on images: Using gradient for readability.

⚠️ Cramped layout: 144 elements lack adequate spacing.

GGoogle FontsVariable Fonts

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

Quantcast ChoiceMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

7 Resources

Scripts

Styles

Async

Defer

Top Script Sources

challenges.fr(3)

Website Identity

challenges.fr

25 years old

AURIC

Social Profiles

Facebook Instagram LinkedIn Bluesky

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Last analyzed: 16 Feb 2026 at 15:34

Historical Analysis & Change Tracking