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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nabu.de

https://nabu.de· First analyzed 15 Feb 2026· Updated 15 Feb 2026

Export

nabu.de

Mobile

Sponsored

Hosting Provider

INTERNET AG Global Network

IP Address

89.146.224.244

Server Location

🇩🇪 Frankfurt am Main, Germany

ASN

AS8495

Organization

INTERNET AG Global Network

Server

Apache

Nameservers

d.inet.ns01.eu.b.inet.ns01.eu.c.inet.ns01.eu.a.inet.ns01.eu.

Performance

Page Speed

10.7 MB

79 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPress

cms

Technology Stack

8 Technologies Detected

Analytics

Google Analytics

Facebook Pixel Matomo

CSS Frameworks

Icon Libraries

Tag Managers

Advertising

Web Servers

SEO Analysis

B70/100

nabu.denabu.de

Wir sind die Naturschutzmacher*innen!

Der NABU ist seit 125 Jahren ein Zuhause für alle, die sich für unsere Natur und Umwelt engagieren. Egal ob im Pulli oder Anzug – Naturschutz kann jede*r.

Title Length37 chars

Recommended: 50-60 chars

Description Length154 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (59/90)

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

6,153 URLs

robots.txt

20 rules

Sponsored

Security Score

21%Critical

Interactive

HTTPS

No WAF

160d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

03.07.2025

Valid Until

25.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.nabu.denabu.de

SHA-256 Fingerprint

37:9C:85:55:49:2C:06:FD:FC:18:AC:79:C6:EA:CF:BE:92:AE:5F:70...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

access-control-allow-headers

origin, x-requested-with, content-type, authorization, accep...

access-control-allow-methods

PUT, GET, POST, DELETE, OPTIONS

cache-control

🔴 No Cache(no-store, no-cache, must-revalidate, post-check=0, pre-check...)

content-encoding

📦 Gzip(gzip)

content-length

20187

content-type

text/html; charset=UTF-8

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

nabu-de.mail.eo.outlook.com

Domain Information

nabu.de

Last Updated

10.03.2022

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Cookie consent banner detected

Typography & Readability

Source Sans Pro

50/100

Readability

/30

22/40

14px · LH --

Hierarchy

/20

25/25

2.57x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Source Sans Pro

Sans36px

Body Font

Source Sans Pro

Sans14px

Contrast Ratio

Reading Comfort

~39 CPL

Needs attention

36px

32px

24px

20px

14px

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

✅ Strong hierarchy: Headlines are 2.6x 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.

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

Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Growing

Behavior Analytics

Matomo (Piwik)Mid-Market

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

18 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(12)stats.nabu.de(2)

Website Identity

Facebook X (Twitter)Instagram LinkedIn YouTube Pinterest

Sponsored

Last analyzed: 15 Feb 2026 at 07:23

Historical Analysis & Change Tracking