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

visa.fr

https://visa.fr· First analyzed 18 Feb 2026· Updated 18 Feb 2026

Export

visa.fr

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

162.159.153.2

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

ns1.dnsvisa.com.ns2.dnsvisa.com.ns3.dnsvisa.com.

Performance

Page Speed

1.1 MB

85 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

BigCommerce

Technology Stack

9 Technologies Detected

Analytics

Google Analytics

Google Analytics 4

Advertising

Google Ads Pinterest Tag

Libraries

CSS Frameworks

Tag Managers

Other

CDN

SEO Analysis

D55/100

visa.frvisa.fr

Visa, un leader de confiance dans les paiements numériques | Visa

Le réseau de paiement Digital et mobile Visa est à la pointe des nouvelles technologies de paiement de paiement, électroniques et sans contact qui forment le...

Description truncated.

Title Length65 chars

Recommended: 50-60 chars

Description Length175 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag - every page should have one H1

6 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

3 rules

Sitemap reference found

Sponsored

Security Score

86%Very Good

Interactive

HTTPS

WAF

210d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

CLOUDFLARE, INC.

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

16.09.2025

Valid Until

16.09.2026

OCSP Stapling

Enabled

Subject Alternative Names (1)

www.visa.fr

SHA-256 Fingerprint

4E:BD:BF:FE:60:FD:DB:96:F4:A0:99:E7:E2:7E:1D:59:70:EF:34:D7...

Upgrade to view header details

HTTP Headers

Developer Console

age

1824

cache-control

🟡 4 Hours(max-age=14400)

cf-cache-status

HIT

cf-ray🇩🇪 Frankfurt

9cf9cc35887e372c-FRA

content-encoding

⚡ Brotli(br)

content-security-policy

self

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

mail.visa.fr

Domain Information

visa.fr

Domain Age

24y 3m

Created

08.11.2001

Expires

13.02.2028

Last Updated

29.01.2026

Registrar

MARKMONITOR Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Typography & Readability

visa-font-latin-regular + sans-serif

72/100

Readability

/30

24/40

14px · LH 1.20

Hierarchy

/20

25/25

2.29x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

visa-font-latin-regular

Sans32px

Body Font

sans-serif

Sans14px

Contrast Ratio

Reading Comfort

~51 CPL

Optimal (45–75)

32px

14px

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

✅ Strong hierarchy: Headlines are 2.3x 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.

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

✅ Optimal line length: ~51 characters per line is comfortable to read.

Buy on MyFonts

Business & Marketing Stack

4 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Google AdsEnterprise

Ad platforms and retargeting pixels

A/B Testing & Optimization

OptimizelyEnterprise

Experimentation and conversion optimization

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(8)tags.tiqcdn.com(4)googleads.g.doubleclick.net(3)youtube.com(2)policy.cookiereports.com(1)

Website Identity

Facebook X (Twitter)Instagram LinkedIn

Sponsored

Last analyzed: 18 Feb 2026 at 01:37

Historical Analysis & Change Tracking