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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univ-nantes.fr

https://univ-nantes.fr· First analyzed 18 Feb 2026· Updated 18 Feb 2026

Export

univ-nantes.fr

Sponsored

Hosting Provider

U Nantes

IP Address

193.52.104.15

Server Location

🇫🇷 Nantes, France

ASN

AS2200

Organization

U Nantes

Server

Apache

Nameservers

vps-unicaen.unicaen.fr.resone.univ-rennes1.fr.dns1.univ-nantes.fr.dns2.univ-nantes.fr.+1 more

Performance

Page Speed

2.6 MB

66 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

U Nantes

Technology Stack

9 Technologies Detected

Libraries

jQueryv1.11.0

jQuery UI

UI Components

Owl Carousel Lightbox

Analytics

Matomo Microsoft Clarity

Other

Leaflet

CSS Frameworks

Tailwind CSS

Web Servers

Apache

SEO Analysis

A80/100

univ-nantes.fruniv-nantes.fr

Nantes Université | Accueil - Nantes Université

Retrouvez toutes les formations, tous les laboratoires de Nantes Université. Découvrez également les initiatives qui rythment la vie des campus.

Title Length47 chars

Recommended: 50-60 chars

Description Length144 chars

Recommended: 120-160 chars

Issues (0)

3 issues found

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Crawlability

Sitemap

Type: standard

robots.txt

12 rules

Sitemap reference found

Sponsored

Security Score

21%Critical

Interactive

HTTPS

No WAF

195d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Hellenic Academic and Research Institutions CA

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

01.09.2025

Valid Until

01.09.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.univ-nantes.fruniv-nantes.fr

SHA-256 Fingerprint

B6:44:25:75:4A:DF:59:1F:7C:C4:E6:46:01:60:4B:C7:64:71:D9:59...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

content-encoding

📦 Gzip(gzip)

content-language

en-GB

content-type

text/html;charset=UTF-8

date

Wed, 18 Feb 2026 08:19:14 GMT

server

Apache

vary

Accept-Encoding

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (2)

mx1.relay.renater.fr

mx2.relay.renater.fr

Domain Information

univ-nantes.fr

Domain Age

31y 1m

Created

31.12.1994

Expires

31.12.2026

Last Updated

31.01.2026

Registrar

GIP RENATER

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

Typography & Readability

source sans pro

60/100

Readability

/30

24/40

14px · LH 1.20

Hierarchy

/20

15/25

1.11x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

source sans pro

Sans16px

Body Font

source sans pro

Sans14px

Contrast Ratio

Reading Comfort

~49 CPL

Optimal (45–75)

16px

36px

26px

14px

Perfect Fifth

Scale

⚠️ Small text: 14px may be hard to read on mobile. Consider 16px+.

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

✅ Good performance: Using 2 font families keeps load times fast.

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

✅ Optimal line length: ~48 characters per line is comfortable to read.

⚠️ Cramped layout: 9 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Growing

Behavior Analytics

Microsoft ClarityFree

Matomo (Piwik)Mid-Market

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(17)scripts.clarity.ms(1)clarity.ms(1)analytics.univ-nantes.fr(1)

Website Identity

Facebook Instagram

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Last analyzed: 18 Feb 2026 at 08:19

Historical Analysis & Change Tracking