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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airbnb.fr

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

Export

airbnb.fr

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

166.117.27.62

Server Location

🇺🇸 Seattle, United States

ASN

AS16509

Organization

AWS Global Accelerator (GLOBAL)

Server

Nginx

Nameservers

ns-394.awsdns-49.com.ns-949.awsdns-54.net.dns1.p07.nsone.net.dns2.p07.nsone.net.+4 more

Performance

Page Speed

2.8 MB

159 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Amazon Web Services (AWS)

Progressive Web App

PWA ReadyWeb ManifestService WorkerApple Touch IconTheme Color

Technology Stack

8 Technologies Detected

Analytics

Other

CSS Frameworks

Tag Managers

Web Servers

Security

SEO Analysis

C67/100

airbnb.frairbnb.fr

Airbnb | Locations de vacances, cabanes, maisons de plage, etc.

Trouvez un Airbnb pour chaque type de voyage → 7 millions de locations de vacances → 2 millions de Coups de cœur voyageurs → Plus de 220 pays et zones géogra...

Description truncated.

Title Length63 chars

Recommended: 50-60 chars

Description Length164 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (40/40)

4 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

863 rules

Sitemap reference found

Sponsored

Security Score

55%Poor

Critical / Transactional

HTTPS

No WAF

342d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Inc

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

27.01.2026

Valid Until

26.01.2027

OCSP Stapling

Enabled

Subject Alternative Names (20)

www.airbnb.comwww.airbnb.com.pywww.airbnb.lawww.airbnb.com.vnwww.airbnb.com.cowww.airbnb.com.bowww.airbnb.issk.airbnb.com+12 more

SHA-256 Fingerprint

F3:83:AF:DC:84:78:CC:2E:9B:95:4A:8A:14:69:80:74:1A:F1:D7:C9...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ch

Sec-CH-Device-Memory, Sec-CH-DPR, ECT, Sec-CH-UA-Platform-Ve...

accept-ch-lifetime

31536000

akamai-request-bc

[a=104.126.37.180,b=350025750,c=g,n=DE_HE_FRANKFURT,o=20940]...

alt-svc

h3=":443"; ma=93600

cache-control

🔴 No Cache(no-store, max-age=0, private, must-revalidate)

cachestatus

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

Domain Information

airbnb.fr

Domain Age

16y 3m

Created

10.11.2009

Expires

12.01.2027

Last Updated

16.12.2024

Registrar

MARKMONITOR Inc.

DNSSEC

Not Enabled

Privacy & Compliance

OneTrust

Cookie Consent Banner

OneTrust

GDPR Indicators

Cookie consent banner detected

CMP: OneTrust

Data Protection Officer mentioned

Typography & Readability

Airbnb Cereal VF

83/100

Readability

/30

32/40

14px · LH 1.43

Hierarchy

/20

25/25

2x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Airbnb Cereal VF

Sans28px

Body Font

Airbnb Cereal VF

Sans14px

Contrast Ratio

Reading Comfort

~36 CPL

Needs attention

28px

14px

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

✅ Optimal line spacing: 1.43 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.0x 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.

Buy on MyFonts

Business & Marketing Stack

4 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

OneTrustEnterprise

Cookie consent and privacy compliance tools

Social Media

Facebook SDKFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

21 Resources

Scripts

Styles

Async

Defer

Top Script Sources

a0.muscache.com(17)googletagmanager.com(2)d0a7e.airbnb.com(1)

Website Identity

airbnb.fr

16 years old

MARKMONITOR Inc.

Social Profiles

Facebook X (Twitter)Instagram

Sponsored

Last analyzed: 18 Feb 2026 at 01:10

Historical Analysis & Change Tracking