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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wpbookingcalendar.com

https://wpbookingcalendar.com· First analyzed 20 Feb 2026· Updated 20 Feb 2026

Export

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Hosting Provider

Hetzner

hetzner.com

IP Address

94.130.161.37

Server Location

🇩🇪 Falkenstein, Germany

ASN

AS24940

Organization

Hetzner

Server

Nginx

Nameservers

dns4.fastdns24.link.dns.fastdns24.com.dns2.fastdns24.org.dns3.fastdns24.eu.

Performance

Page Speed

3 MB

40 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPress

cms

WP Develop v.3.0v3.0

by wpdevelop

View Theme

Technology Stack

12 Technologies Detected

Plugins

Smart Slider 3 Ewww Image Optimizer Quick Pagepost Redirect Plugin

Analytics

Libraries

UI Components

Other

CSS Frameworks

Fonts

Web Servers

Customer Support

SEO Analysis

B70/100

wpbookingcalendar.comwpbookingcalendar.com

WP Booking Calendar - The #1 Booking Plugin for WordPress.WP Bookin...

Easily manage full-day bookings, time-slot appointments, or events with WP Booking Calendar – the all-in-one, most advanced booking system for WordPress.

Title truncated.

Title Length246 chars

Recommended: 50-60 chars

Description Length153 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (15/22)

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

5 URLs

robots.txt

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Security Score

76%Good

Static / Informational

HTTPS

No WAF

81d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

12.02.2026

Valid Until

13.05.2026

Subject Alternative Names (2)

wpbookingcalendar.comwww.wpbookingcalendar.com

SHA-256 Fingerprint

D8:DA:47:E3:22:1D:66:6F:7A:8B:AB:41:F7:E0:DB:50:53:26:29:FC...

Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-cache)

connection

keep-alive

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=UTF-8

date

Fri, 20 Feb 2026 01:28:07 GMT

last-modified

Thu, 19 Feb 2026 08:24:41 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

mail.wpbookingcalendar.com

Domain Information

wpbookingcalendar.com

Domain Age

14y 2m

Created

25.12.2011

Expires

25.12.2033

Last Updated

31.07.2024

Registrar

NameCheap, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

Inter + sans-serif

54/100

Readability

/30

25/40

16px · LH 2.10

Hierarchy

/20

8/25

1.12x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Inter

Sans18px

Body Font

sans-serif

Sans16px

Contrast Ratio

Reading Comfort

~36 CPL

Needs attention

18px

15px

16px

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

⚠️ Wide line spacing (2.10). Consider 1.4-1.8 for better flow.

⚠️ Weak hierarchy: Headlines should be at least 2x body size for clear visual structure.

✅ Good performance: Using 1 font families keeps load times fast.

✅ Consistent design: Single font family with weight variations is a modern best practice.

✅ Protected text on images: Using gradient for readability.

GGoogle Fonts Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

Google Tag ManagerFree

User behavior and product analytics

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Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

wpbookingcalendar.com(16)googletagmanager.com(1)

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Last analyzed: 20 Feb 2026 at 01:28

Historical Analysis & Change Tracking