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

pasteur.fr

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

Export

pasteur.fr

Sponsored

Hosting Provider

INSTITUT-PASTEUR

IP Address

157.99.21.46

Server Location

🇫🇷 Paris, France

ASN

AS29110

Server

Apache

Nameservers

nsb.perf1.com.nsc.perf1.com.nsa.perf1.fr.

Performance

Page Speed

3.6 MB

85 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Drupal

Technology Stack

11 Technologies Detected

Libraries

Analytics

UI Components

Other

CSS Frameworks

Fonts

Tag Managers

Web Servers

Languages

SEO Analysis

B70/100

pasteur.frpasteur.fr

Institut Pasteur | Pour chaque vie, la science agit

No description available for this page.

Title Length51 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (1)

• Missing meta description - important for click-through rates

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

3,524 URLs

robots.txt

70 rules

Sponsored

Security Score

56%Poor

Interactive

HTTPS

No WAF

141d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Hellenic Academic and Research Institutions CA

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

08.07.2025

Valid Until

08.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.pasteur.frpasteur.fr

SHA-256 Fingerprint

14:89:18:5D:9E:FC:57:3B:C4:7A:11:30:B9:8E:D2:F2:01:80:CD:45...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

age

cache-control

🟡 180s(public, max-age=180)

connection

Keep-Alive

content-encoding

📦 Gzip(gzip)

content-language

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (2)

mx3.pasteur.fr

mx2.pasteur.fr

Domain Information

pasteur.fr

Domain Age

31y 1m

Created

31.12.1994

Expires

10.02.2029

Last Updated

02.07.2025

Registrar

NAMESHIELD

DNSSEC

Not Enabled

Privacy & Compliance

Axeptio

Cookie Consent Banner

Axeptio

GDPR Indicators

Cookie consent banner detected

CMP: Axeptio

Typography & Readability

Brandon

58/100

Readability

/30

32/40

14px · LH 1.50

Hierarchy

/20

25/25

2x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Brandon

Sans28px

Body Font

Brandon

Sans14px

Contrast Ratio

Reading Comfort

~35 CPL

Needs attention

28px

40px

20px

14px

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.0x larger than body text.

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

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

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

GGoogle Fonts Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Microsoft AdsEnterprise

Ad platforms and retargeting pixels

Sponsored

Scripts & Styles

27 Resources

Scripts

Styles

Async

Defer

Top Script Sources

googletagmanager.com(6)api.realytics.io(3)pasteur.fr(3)tp.realytics.io(1)api-v6.realytics.net(1)

Website Identity

Facebook Instagram LinkedIn YouTube Bluesky

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Last analyzed: 16 Feb 2026 at 12:55

Historical Analysis & Change Tracking