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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zdfheute.de

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

Export

zdfheute.de

Mobile

Sponsored

Hosting Provider

ZDF Zweites Deutsches Fernsehen

IP Address

91.197.29.51

Server Location

🇩🇪 Mainz, Germany

ASN

AS43354

Organization

ZDF Zweites Deutsches Fernsehen

Nameservers

a22-67.akam.net.a9-66.akam.net.a14-66.akam.net.a1-107.akam.net.+4 more

Performance

Page Speed

3.8 MB

239 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Hybrid

🔀 Hybrid

Frontend

Framework

Next.js

Infrastructure

Hosting

ZDF Zweites Deutsches Fernsehen

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

2 Technologies Detected

Meta Frameworks

Next.js Astro

SEO Analysis

A+100/100

zdfheute.dezdfheute.de

ZDFheute - Aktuelle Nachrichten und Videos auf einen Blick

News aus Deutschland sowie aktuelle Nachrichten aus Europa und aller Welt. Videos, Livestreams, Kommentare und Analysen von Politik bis Sport.

Title Length58 chars

Recommended: 50-60 chars

Description Length142 chars

Recommended: 120-160 chars

Sponsored

Security Score

41%Poor

Interactive

HTTPS

No WAF

178d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

13.08.2025

Valid Until

12.08.2026

OCSP Stapling

Enabled

Subject Alternative Names (20)

www.zdf.de*.3sat.de*.heute.de*.logo.de*.phoenix.de*.sc.zdf.de*.tivi.de*.zdf.de+12 more

SHA-256 Fingerprint

7B:25:0E:76:55:1D:1A:28:B7:59:1F:35:E1:45:5B:A1:12:7D:8C:2A...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

cache-control

🔴 No Cache(max-age=0, no-cache, private)

cache-status

ingress-cache; hit; ttl=6.418; detail='now:Sun, 15 Feb 2026 ...

content-encoding

📦 Gzip(gzip)

content-length

492518

content-security-policy

default-src 'self'; connect-src *; style-src 'self' 'unsafe-...

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

Domain Information

zdfheute.de

Last Updated

21.05.2014

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

font

60/100

Readability

/30

12/40

12px · LH 1.30

Hierarchy

/20

25/25

2.67x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

font

Sans32px

Body Font

font

Sans12px

Contrast Ratio

Reading Comfort

Single Font Family

left aligned

32px

24px

18px

12px

❌ Critical: 12px body text is too small. Increase to at least 14px.

✅ Strong hierarchy: Headlines are 2.7x 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

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(20)

Website Identity

Facebook X (Twitter)Instagram

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Last analyzed: 15 Feb 2026 at 04:43

Historical Analysis & Change Tracking