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

immowelt.de

https://immowelt.de· First analyzed 20 Feb 2026· Updated 20 Feb 2026

Export

immowelt.de

Mobile

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

3.174.113.44

Server Location

🇫🇮 Helsinki, Finland

ASN

AS16509

Organization

AWS CloudFront (GLOBAL)

Server

CloudFront

CDN

CloudFront

Nameservers

ns-1797.awsdns-32.co.uk.ns-260.awsdns-32.com.ns-857.awsdns-43.net.ns-1233.awsdns-26.org.

Performance

Page Speed

2 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Amazon Web Services (AWS)

CDN

CloudFront

Technology Stack

1 Technologies Detected

CDN

Amazon CloudFront

SEO Analysis

F17/100

immowelt.deimmowelt.de

immowelt.de

No description available for this page.

Title Length11 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

• Missing meta description - important for click-through rates
• Missing H1 tag - every page should have one H1

7 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

78 rules

Sitemap reference found

Sponsored

Security Score

56%Poor

Interactive

HTTPS

No WAF

250d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Amazon

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

29.09.2025

Valid Until

28.10.2026

OCSP Stapling

Enabled

Subject Alternative Names (3)

www.immowelt.deimmowelt.unified-lion-live.aws.aviv.eu*.immowelt.de

SHA-256 Fingerprint

63:C6:0C:CF:E7:F7:16:D3:AD:19:D0:D4:6F:A7:3A:5E:39:11:52:6F...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ch

Sec-CH-UA,Sec-CH-UA-Mobile,Sec-CH-UA-Platform,Sec-CH-UA-Arch...

cache-control

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

charset

utf-8

content-length

771

content-type

text/html;charset=utf-8

date

Fri, 20 Feb 2026 01:11:49 GMT

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (5)

alt2.aspmx.l.google.com

alt3.aspmx.l.google.com

alt1.aspmx.l.google.com

alt4.aspmx.l.google.com

+1 more

Domain Information

immowelt.de

Last Updated

11.02.2025

DNSSEC

Not Enabled

Typography & Readability

Times New Roman

61/100

Readability

/30

30/40

16px · LH --

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Times New Roman

Body Font

Times New Roman

Serif16px

Contrast Ratio

Reading Comfort

Single Family

left aligned

✅ Excellent readability: 16px body text is ideal for all devices.

✅ Good performance: Using 1 font families keeps load times fast.

⚠️ Inconsistent alignment: Mix of left/center/right creates visual noise.

Buy on MyFonts

Sponsored

Scripts & Styles

1 Resources

Scripts

Styles

Async

Defer

Top Script Sources

ct.captcha-delivery.com(1)

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Last analyzed: 20 Feb 2026 at 01:11

Historical Analysis & Change Tracking