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

online.fr

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

Export

online.fr

Mobile

Sponsored

Hosting Provider

Scaleway

scaleway.com

IP Address

51.159.69.144

Server Location

🇫🇷 Paris, France

ASN

AS12876

Organization

ONLINE

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

freens1-g20.free.fr.freens2-g20.free.fr.

Performance

Page Speed

1.9 MB

64 requests

Image Optimization

Lazy LoadWebP

0–49

50–89

90–100

Architecture Stack

Hybrid

⚡ SSG

Frontend

Framework

Next.js

CMS

Strapi

Infrastructure

Hosting

Scaleway

CDN

Cloudflare

Progressive Web App

Web ManifestApple Touch Icon

Technology Stack

2 Technologies Detected

Meta Frameworks

Next.js

CDN

Cloudflare

SEO Analysis

B70/100

online.fronline.fr

Serveurs dédiés : dès 4,99€ HT/mois | Scaleway

Une gamme de serveurs dédiés, haut de gamme et performants basés en Europe.

Title Length46 chars

Recommended: 50-60 chars

Description Length77 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (21/26)

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

robots.txt

26 rules

Sitemap reference found

Sponsored

Security Score

55%Poor

Critical / Transactional

HTTPS

WAF

371d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Sectigo Limited

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

19.01.2026

Valid Until

19.02.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.scaleway.comscaleway.com

SHA-256 Fingerprint

2B:A5:0D:52:50:B2:26:99:E7:8E:A6:C8:6D:42:A8:CD:67:86:8F:F8...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

age

335

alt-svc

h3=":443"; ma=86400

cache-control

🔴 No Cache(public, max-age=60, stale-while-revalidate=300, stale-if-err...)

cf-cache-status

UPDATING

cf-ray🇩🇪 Frankfurt

9cd6bf41ce29973e-FRA

content-encoding

⚡ Brotli(br)

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (2)

mx1.free.fr

mx2.free.fr

Domain Information

online.fr

Domain Age

17y 1m

Created

29.12.2008

Expires

29.12.2026

Last Updated

23.02.2025

Registrar

SCALEWAY

DNSSEC

Not Enabled

Typography & Readability

Space Grotesk + Inter

92/100

Readability

/30

40/40

16px · LH 1.50

Hierarchy

/20

25/25

3.5x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

17/20

System fonts

Heading Font

Space Grotesk

Sans56px

Body Font

Inter

Sans16px

Contrast Ratio

Reading Comfort

~36 CPL

Needs attention

56px

48px

24px

16px

✅ Excellent readability: 16px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 3.5x larger than body text.

✅ Excellent performance: System fonts eliminate font loading delays (better LCP).

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

✅ Protected text on images: Using gradient for readability.

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(15)

Website Identity

X (Twitter)Instagram LinkedIn

Sponsored

Last analyzed: 13 Feb 2026 at 19:32

Historical Analysis & Change Tracking