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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bahn.de

https://bahn.de· First analyzed 12 Feb 2026· Updated 12 Feb 2026

Export

bahn.de

Mobile

Sponsored

Hosting Provider

BAHN

IP Address

81.200.196.33

Server Location

🇩🇪 Frankfurt am Main, Germany

ASN

AS34156

Organization

BAHN

CDN

Akamai

WAF

Akamai

Nameservers

ns-1759.awsdns-27.co.uk.ns-375.awsdns-46.com.ns-680.awsdns-21.net.ns-1259.awsdns-29.org.

Performance

Page Speed

1.3 MB

189 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

BAHN

CDN

Akamai

Technology Stack

1 Technologies Detected

CSS Frameworks

Tailwind CSS

SEO Analysis

C68/100

bahn.debahn.de

DB Fahrplan, Auskunft, Tickets, informieren und buchen - Deutsche Bahn

Deutsche Bahn: bahn.de - Ihr Mobilitätsportal für Reisen mit der Bahn. Deutschlands beliebtestes Reise- und Mobilitätsportal: Auskunft, Bahnfahrkarten, Onlin...

Description truncated.

Title Length70 chars

Recommended: 50-60 chars

Description Length229 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (17/20)

4 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

7 rules

Sponsored

Security Score

81%Very Good

Interactive

HTTPS

WAF

40d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

25.12.2025

Valid Until

25.03.2026

Subject Alternative Names (12)

app-abn-staging.services-bahn.deapp-abn.services-bahn.deapp.services-bahn.decms-abn.static-bahn.decms.static-bahn.deid-abn-staging.bahn.deid-abn.bahn.deid.bahn.de+4 more

SHA-256 Fingerprint

66:E0:F0:51:67:44:94:72:94:F7:43:6A:D3:5F:27:05:1E:73:D8:B3...

Upgrade to view header details

HTTP Headers

Developer Console

akamai-grn

0.af011002.1770911118.765d620

cache-control

🟡 259s(public, max-age=259)

content-encoding

⚡ Brotli(br)

content-length

12726

content-security-policy

default-src 'self'; worker-src 'self' blob:; script-src 's...

content-type

text/html;charset=UTF-8

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

100

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

bahn-de.mail.protection.outlook.com

Domain Information

bahn.de

Last Updated

27.11.2025

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

DBScreenHead

48/100

Readability

/30

32/40

20px · LH 1.20

Hierarchy

/20

13/25

1.6x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

DBScreenHead

Sans32px

Body Font

DBScreenHead

Sans20px

Contrast Ratio

Reading Comfort

~39 CPL

Needs attention

32px

24px

18px

20px

✅ Excellent readability: 20px body text is ideal for all devices.

✅ Good hierarchy: Clear distinction between headlines and body text.

✅ Good performance: Using 2 font families keeps load times fast.

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

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

⚠️ Cramped layout: 25 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Advanced

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

A/B Testing & Optimization

OptimizelyEnterprise

Experimentation and conversion optimization

Sponsored

Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

cms.static-bahn.de(7)local(4)ucm-eu.verint-cdn.com(1).(1)

Website Identity

Facebook Instagram LinkedIn

Sponsored

Last analyzed: 12 Feb 2026 at 15:45

Historical Analysis & Change Tracking