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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insee.fr

https://insee.fr· First analyzed 13 Feb 2026· Updated 13 Feb 2026

Export

insee.fr

Mobile

Sponsored

Hosting Provider

Insee

IP Address

194.254.37.163

Server Location

🇫🇷 Maisons-Alfort, France

ASN

AS2200

Organization

Insee

Server

unknown

Nameservers

nsc.perf1.com.nsb.perf1.com.ns2.insee.fr.ns1.insee.fr.+1 more

Performance

Page Speed

2 MB

41 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Insee

Technology Stack

6 Technologies Detected

Libraries

Other

UI Components

CSS Frameworks

Analytics

SEO Analysis

C61/100

insee.frinsee.fr

Accueil - Insee - Institut national de la statistique et des études...

L’Institut national de la statistique et des études économiques collecte, produit, analyse et diffuse des informations sur l’économie et la société françaises

Title truncated.

Title Length79 chars

Recommended: 50-60 chars

Description Length158 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag - every page should have one H1

5 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

robots.txt

8 rules

Sitemap reference found

Sponsored

Security Score

66%Fair

Interactive

HTTPS

No WAF

51d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Certigna

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

05.01.2026

Valid Until

05.04.2026

Subject Alternative Names (4)

previsualisation.insee.frwww.insee.frtiles.insee.frinsee.fr

SHA-256 Fingerprint

48:54:05:AB:33:95:70:E9:51:72:BD:CB:18:B4:15:3D:C5:CD:8E:DF...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-cache, no-store, max-age=0, must-revalidate)

content-encoding

📦 Gzip(gzip)

content-language

en-GB

content-type

text/html;charset=UTF-8

date

Fri, 13 Feb 2026 09:47:38 GMT

expires

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (4)

freyja.insee.fr

heimdall.insee.fr

freyja2.insee.fr

heimdall2.insee.fr

Domain Information

insee.fr

Domain Age

29y 9m

Created

06.05.1996

Expires

28.10.2026

Last Updated

03.02.2026

Registrar

CSC CORPORATE DOMAINS INC.

DNSSEC

Not Enabled

Typography & Readability

Open Sans

31/100

Readability

/30

5/40

12px · LH 1.00

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Open Sans

Sans

Body Font

Open Sans

Sans12px

Contrast Ratio

Reading Comfort

Single Font Family

left aligned

13px

15px

12px

Major Second

Scale

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

⚠️ Tight line spacing (1.00). Consider 1.4-1.6 for better readability.

✅ 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.

⚠️ Cramped layout: 20 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Matomo (Piwik)Mid-Market

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

11 Resources

Scripts

Styles

Async

Defer

Top Script Sources

(3)local(3)cdn.matomo.cloud(1)

Website Identity

X (Twitter)Instagram LinkedIn Bluesky

Sponsored

Last analyzed: 13 Feb 2026 at 09:47

Historical Analysis & Change Tracking