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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persee.fr

https://persee.fr· First analyzed 14 Feb 2026· Updated 14 Feb 2026

Export

persee.fr

Mobile

Sponsored

Hosting Provider

Super.so

super.so

IP Address

140.77.166.118

Server Location

🇫🇷 Lyon, France

ASN

AS1945

Organization

Ecole Normale Superieure De Lyon

Server

Apache

Nameservers

dns2.ens-lyon.fr.diogene.univ-lyon2.fr.dns.ens-lyon.fr.

Performance

Page Speed

3.1 MB

42 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Super.so

Technology Stack

5 Technologies Detected

Analytics

CSS Frameworks

Icon Libraries

Web Servers

SEO Analysis

D41/100

persee.frpersee.fr

Persée : Accéder à des milliers de publications scientifiques - Persée

Consultation et exploitation libre et gratuite de collections complètes de documents scientifiques.

Title Length70 chars

Recommended: 50-60 chars

Description Length99 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag - every page should have one H1

8 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

457 URLs

robots.txt

19 rules

Sitemap reference found

Sponsored

Security Score

56%Poor

Interactive

HTTPS

No WAF

279d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Hellenic Academic and Research Institutions CA

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

20.11.2025

Valid Until

20.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (9)

www.persee.frshf.persee.freducation.persee.frmom.persee.frefr.persee.frpersee.frephe.persee.frathar.persee.fr+1 more

SHA-256 Fingerprint

1F:5B:47:79:7A:70:7A:CC:40:9F:2B:1C:FD:D7:CA:4C:2A:8F:A0:98...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

access-control-allow-headers

X-Requested-With, Content-Type

access-control-allow-origin

cache-control

⚪ Custom(no-transform)

connection

Keep-Alive

content-type

text/html;charset=UTF-8

date

Sat, 14 Feb 2026 13:44:20 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (6)

mxd.relay.renater.fr

mxc.relay.renater.fr

mxa.relay.renater.fr

mxb.relay.renater.fr

+2 more

Domain Information

persee.fr

Domain Age

21y 7m

Created

12.07.2004

Expires

27.07.2026

Last Updated

31.08.2025

Registrar

GIP RENATER

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

Typography & Readability

Bebas Kai + ifao-n-copte

41/100

Readability

/30

32/40

14px · LH 1.43

Hierarchy

/20

8/25

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Bebas Kai

Sans

Body Font

ifao-n-copte

Sans14px

Contrast Ratio

Reading Comfort

~39 CPL

Needs attention

32px

25px

18px

14px

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

✅ Optimal line spacing: 1.43 ratio ensures comfortable reading.

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

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

⚠️ Risky: Text appears on background images without overlay protection.

⚠️ Cramped layout: 12 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

18 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(5)persee.fr(3)google-analytics.com(1)

Website Identity

X (Twitter)LinkedIn Bluesky

Sponsored

Last analyzed: 14 Feb 2026 at 13:09

Historical Analysis & Change Tracking