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.

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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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rki.de

https://rki.de· First analyzed 13 Feb 2026· Updated 13 Feb 2026

Export

rki.de

Mobile

Sponsored

Hosting Provider

Itzbund

IP Address

80.245.144.175

Server Location

🇩🇪 Frankfurt am Main, Germany

ASN

AS35704

Organization

Itzbund

Server

Apache

Nameservers

deneb.dfn.de.vaccine.rki.de.

Performance

Page Speed

6.5 MB

28 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Itzbund

Technology Stack

6 Technologies Detected

Meta Frameworks

Libraries

UI Components

CSS Frameworks

Analytics

Web Servers

SEO Analysis

B72/100

rki.derki.de

RKI - Startseite

Das Robert Koch-Institut ist die zentrale Einrichtung der Bundesregierung auf dem Gebiet der Krankheitsüberwachung und –prävention.

Title Length18 chars

Recommended: 50-60 chars

Description Length131 chars

Recommended: 120-160 chars

Issues (0)

4 issues found

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Security Score

81%Very Good

Interactive

HTTPS

No WAF

238d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

D-Trust GmbH

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

08.10.2025

Valid Until

10.10.2026

OCSP Stapling

Enabled

Subject Alternative Names (20)

www.rki.dejobs.rki.dewww.jobs.rki.dewww.karriere.rki.dekarriere.rki.destakob.dewww.stakob.destakob.org+12 more

SHA-256 Fingerprint

CE:CE:4F:45:16:86:AA:9A:B7:67:2D:AC:9A:CD:53:8B:7A:FE:16:8A...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🟡 1 Hours(max-age=3600)

connection

Keep-Alive

content-language

content-security-policy

script-src 'self' https://www.youtube.com https://piwik.itzb...

content-type

text/html;charset=utf-8

date

Fri, 13 Feb 2026 10:17:37 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (2)

mx2.bund.de

mx1.bund.de

Domain Information

rki.de

Last Updated

21.09.2018

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Cookie consent banner detected

Typography & Readability

lato

88/100

Readability

/30

40/40

18px · LH 1.40

Hierarchy

/20

25/25

2x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

lato

Sans36px

Body Font

lato

Sans18px

Contrast Ratio

Reading Comfort

~45 CPL

Optimal (45–75)

36px

28px

22px

18px

✅ Excellent readability: 18px body text is ideal for all devices.

✅ Optimal line spacing: 1.40 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.

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Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Matomo (Piwik)Mid-Market

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

13 Resources

Scripts

Styles

Async

Defer

Top Script Sources

rki.de(5)

Website Identity

Instagram LinkedIn Bluesky

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Last analyzed: 13 Feb 2026 at 10:17

Historical Analysis & Change Tracking