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.

Back to Search

test.de

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

Export

test.de

Mobile

Sponsored

Hosting Provider

IP via link11.de

IP Address

128.65.209.96

Server Location

🇩🇪 Frankfurt am Main, Germany

ASN

AS34309

Organization

IP via link11.de

Nameservers

dns2.iwelt-ag.net.dns3.iwelt-ag.de.dns.iwelt-ag.net.

Performance

Page Speed

155 KB

35 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Headless

⚙️ SSR

Decoupled

API

Data Source

Headless CMS

Strapi

Infrastructure

Hosting

IP via link11.de

Detected API Sources

https://cdn-eu.piano.io/api/ti...

Technology Stack

7 Technologies Detected

Analytics

Frameworks

CSS Frameworks

Tag Managers

Customer Support

SEO Analysis

B76/100

test.detest.de

Startseite | Stiftung Warentest – Unabhängige Tests & Ratgeber

Stiftung Warentest: Testberichte zu Elektronik, Haushalt und Gesundheit sowie Finanzen, Versicherung und Steuern

Title Length62 chars

Recommended: 50-60 chars

Description Length112 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (65/67)

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

53 rules

Sitemap reference found

Sponsored

Security Score

46%Poor

Interactive

HTTPS

No WAF

140d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

GlobalSign nv-sa

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

03.06.2025

Valid Until

05.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.test.detest.de

SHA-256 Fingerprint

7D:44:24:FE:94:13:3B:4A:36:63:0E:37:52:32:F3:07:DF:F1:7E:25...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-store,no-cache)

content-encoding

⚡ Brotli(br)

content-type

text/html; charset=utf-8

date

Sat, 14 Feb 2026 15:02:02 GMT

expires

-1

link

<https://cdn.test.de/file/image/38/12/a19ab82d-4507-44c8-a04...

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (2)

sw-proxy01.stiftung-warentest.de

mx.colt.net

Domain Information

test.de

Last Updated

14.08.2024

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Typography & Readability

arial

80/100

Readability

/30

32/40

15px · LH 1.40

Hierarchy

/20

25/25

3.2x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

arial

Sans48px

Body Font

arial

Sans15px

Contrast Ratio

Reading Comfort

~37 CPL

Needs attention

48px

20px

22px

15px

⚠️ Small text: 15px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.40 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 3.2x 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.

Buy on MyFontsVariable Fonts

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Reviews & Social Proof

TrustpilotMid-Market

Customer reviews and testimonials

Sponsored

Scripts & Styles

6 Resources

Scripts

Styles

Async

Defer

Top Script Sources

cdn.cxense.com(2)cdn-eu.piano.io(1)test.de(1)experience-eu.piano.io(1)cdn.test.de(1)

Website Identity

Facebook Instagram LinkedIn YouTube TikTok

Sponsored

Last analyzed: 14 Feb 2026 at 15:02

Historical Analysis & Change Tracking