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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doctolib.fr

https://doctolib.fr· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

doctolib.fr

Sponsored

Hosting Provider

Doctolib-Inetnum

IP Address

93.115.102.100

Server Location

🇫🇷 Levallois-Perret, France

ASN

AS209242

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

naomi.ns.cloudflare.com.bob.ns.cloudflare.com.

Performance

Page Speed

3.3 MB

141 requests

Image Optimization

Lazy LoadWebPAVIFResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Tailwind CSS

CMS

Medium

Infrastructure

Hosting

Doctolib-Inetnum

CDN

Cloudflare

Technology Stack

9 Technologies Detected

Customer Support

Analytics

Meta Frameworks

CSS Frameworks

CDN

Marketing

Security

SEO Analysis

D58/100

doctolib.frdoctolib.fr

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Title Length55 chars

Recommended: 50-60 chars

Description Length113 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (14/20)

5 issues found

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Crawlability

Sitemap

Type: standard

robots.txt

54 rules

Sitemap reference found

Sponsored

Security Score

66%Fair

Interactive

HTTPS

WAF

159d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Gandi

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

03.07.2025

Valid Until

26.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.doctolib.frdoctolib.fr

SHA-256 Fingerprint

30:68:2B:62:B3:55:64:5B:D0:AA:FF:BE:6E:49:5E:07:DD:DA:A9:90...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🟡 0s(max-age=0, private, must-revalidate)

cf-cache-status

DYNAMIC

cf-ray🇩🇪 Frankfurt

9cf1b7b85ce7353c-FRA

content-encoding

📦 Gzip(gzip)

content-language

content-security-policy-report-only

default-src 'self'; script-src report-sample 'self' https://...

Good Warning Issue

Email Infrastructure

Google Workspace

Score

100

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (5)

alt2.aspmx.l.google.com

alt4.aspmx.l.google.com

alt3.aspmx.l.google.com

aspmx.l.google.com

+1 more

Domain Information

doctolib.fr

Domain Age

12y 7m

Created

09.07.2013

Expires

13.09.2026

Last Updated

14.09.2025

Registrar

CSC CORPORATE DOMAINS INC.

DNSSEC

Not Enabled

Privacy & Compliance

Didomi

Cookie Consent Banner

Didomi

GDPR Indicators

Cookie consent banner detected

CMP: Didomi

Data Protection Officer mentioned

Data subject rights referenced

Typography & Readability

arial + Roboto

62/100

Readability

/30

32/40

15px · LH 1.60

Hierarchy

/20

25/25

2.13x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

arial

Sans32px

Body Font

Roboto

Sans15px

Contrast Ratio

Reading Comfort

~41 CPL

Needs attention

32px

24px

14px

15px

⚠️ Small text: 15px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.60 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.1x 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.

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

Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

19 Resources

Scripts

Styles

Async

Defer

Top Script Sources

assets.doctolib.fr(5)sdk.privacy-center.org(2)datadoghq-browser-agent.com(1)js.sentry-cdn.com(1)

Website Identity

Facebook Instagram LinkedIn YouTube Medium

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Last analyzed: 17 Feb 2026 at 02:05

Historical Analysis & Change Tracking