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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service-public.fr

https://service-public.fr· First analyzed 11 Feb 2026· Updated 11 Feb 2026

Export

service-public.fr

Mobile

Sponsored

Hosting Provider

Worldline SA

IP Address

160.92.168.33

Server Location

🇫🇷 Paris, France

ASN

AS47957

Organization

Worldline SA

Nameservers

ns1.dila.fr.ns2.dila.fr.ns3.dila.fr.ns4.dila.fr.

Performance

Page Speed

850 KB

93 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Worldline SA

Progressive Web App

Web ManifestApple Touch Icon

Technology Stack

3 Technologies Detected

Libraries

jQuery

CSS Frameworks

Tailwind CSS

Other

AB Tasty

SEO Analysis

C62/100

service-public.frservice-public.fr

Accueil | Service Public

Service Public - Vos droits et démarches plus simplement

Title Length24 chars

Recommended: 50-60 chars

Description Length56 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (6/11)

4 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

13 rules

Sponsored

A+

Security Score

95%Excellent

Interactive

HTTPS

No WAF

67d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DHIMYOTIS

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

19.01.2026

Valid Until

19.04.2026

OCSP Stapling

Enabled

Subject Alternative Names (4)

service-public.gouv.frwww.service-public.gouv.frservice-public.frwww.service-public.fr

SHA-256 Fingerprint

D8:F3:9E:0D:BA:2C:34:67:58:AD:B0:45:04:65:61:4E:3D:91:67:42...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

access-control-allow-credentials

true

access-control-allow-headers

Origin, X-Requested-With, Content-Type, Accept, Authorizatio...

access-control-allow-methods

GET, POST, PUT, DELETE, OPTIONS

access-control-allow-origin

https://lannuaire.service-public.gouv.fr

age

456

cache-control

🟡 0s(max-age=0, s-maxage=28800, public)

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (2)

relay1-c.dila.fr

relay2-c.dila.fr

Typography & Readability

Marianne

58/100

Readability

/30

12/40

13px · LH 1.88

Hierarchy

/20

25/25

2.5x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Marianne

Sans32px

Body Font

Marianne

Sans13px

Contrast Ratio

Reading Comfort

~45 CPL

Needs attention

32px

28px

16px

13px

❌ Critical: 13px body text is too small. Increase to at least 14px.

✅ Strong hierarchy: Headlines are 2.5x larger than body text.

✅ Good performance: Using 1 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.

✅ Protected text on images: Using gradient for readability.

Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

A/B Testing & Optimization

AB TastyMid-Market

Experimentation and conversion optimization

Sponsored

Scripts & Styles

24 Resources

Scripts

Styles

Async

Defer

Top Script Sources

service-public.gouv.fr(19)jcmm.service-public.gouv.fr(1)

Website Identity

Facebook Instagram LinkedIn GitHub TikTok

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Last analyzed: 11 Feb 2026 at 13:50

Historical Analysis & Change Tracking