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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kfw.de

https://kfw.de· First analyzed 14 Feb 2026· Updated 14 Feb 2026

Export

kfw.de

Mobile

Sponsored

Hosting Provider

1&1 Versatel Deutschland GmbH

IP Address

104.151.29.97

Server Location

🇩🇪 Dortmund, Germany

ASN

AS8881

Organization

1&1 Versatel Deutschland GmbH

Nameservers

c.ns14.net.b.ns14.net.d.ns14.net.a.ns14.net.

Performance

Page Speed

1.8 MB

87 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Headless

⚙️ SSR

Decoupled

API

Data Source

Headless CMS

Strapi

Infrastructure

Hosting

1&1 Versatel Deutschland GmbH

Detected API Sources

https://responder.wt-safetag.c...

Technology Stack

3 Technologies Detected

Libraries

jQueryv3.6.0

CSS Frameworks

Tailwind CSS

Icon Libraries

Font Awesome

SEO Analysis

B78/100

kfw.dekfw.de

Bank aus Verantwortung | KfW

Hier erfahren Sie mehr über die vielfältigen Förderkredite und Förderprogramme für Unternehmen und Privatpersonen. KfW - Die Bank aus Verantwortung.

Title Length28 chars

Recommended: 50-60 chars

Description Length148 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (45/58)

2 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

4 URLs

robots.txt

40 rules

Sitemap reference found

Sponsored

Security Score

86%Very Good

Interactive

HTTPS

No WAF

224d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Deutsche Telekom Security GmbH

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

22.09.2025

Valid Until

26.09.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.kfw.dekfw.de

SHA-256 Fingerprint

8F:62:58:59:B1:BC:6A:B3:A5:57:0E:F2:A7:B9:18:E7:E8:92:36:93...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

cache-control

🟡 0s(max-age=0)

connection

Keep-Alive

content-encoding

📦 Gzip(gzip)

content-language

content-length

16404

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (2)

mx10.kfw.de

mx20.kfw.de

Domain Information

kfw.de

Last Updated

16.10.2025

DNSSEC

Not Enabled

Privacy & Compliance

Usercentrics

Cookie Consent Banner

Usercentrics

GDPR Indicators

Cookie consent banner detected

CMP: Usercentrics

Typography & Readability

KfW-Centro-Sans

43/100

Readability

/30

32/40

22px · LH 1.30

Hierarchy

/20

8/25

1.45x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

KfW-Centro-Sans

Sans32px

Body Font

KfW-Centro-Sans

Sans22px

Contrast Ratio

Reading Comfort

~38 CPL

Needs attention

32px

16px

22px

✅ Excellent readability: 22px body text is ideal for all devices.

⚠️ 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.

✅ 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

22 Resources

Scripts

Styles

Async

Defer

Top Script Sources

web.cmp.usercentrics.eu(7)local(7)kfw.de(2)d556wsm.keyingress.de(2)responder.wt-safetag.com(1)

Website Identity

Facebook X (Twitter)Instagram LinkedIn

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Last analyzed: 14 Feb 2026 at 07:48

Historical Analysis & Change Tracking