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

dfg.de

https://dfg.de· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

dfg.de

Sponsored

Hosting Provider

CONET Deutschland GmbH

IP Address

217.19.13.128

Server Location

🇩🇪 Düsseldorf, Germany

ASN

AS198913

Organization

CONET Deutschland GmbH

Nameservers

dns-1.dfn.de.dns-3.dfn.de.dns-2.dfn.de.

Performance

Page Speed

609 KB

12 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

Alpine.js

Infrastructure

Hosting

CONET Deutschland GmbH

Technology Stack

6 Technologies Detected

Frameworks

Other

CSS Frameworks

Fonts

Analytics

Advertising

SEO Analysis

D56/100

dfg.dedfg.de

DFG

Die DFG ist die größte Forschungsfördereinrichtung und zentrale Selbstverwaltungsorganisation der Wissenschaft in Deutschland.

Title Length3 chars

Recommended: 50-60 chars

Description Length126 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (5/6)

5 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

robots.txt

12 rules

Sitemap reference found

Sponsored

Security Score

76%Good

Interactive

HTTPS

No WAF

43d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

02.01.2026

Valid Until

02.04.2026

Subject Alternative Names (2)

dfg.dewww.dfg.de

SHA-256 Fingerprint

0F:8E:5D:8F:B8:E3:CE:ED:12:D7:BB:B9:58:49:3F:D3:73:60:63:41...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

age

cache-control

🟡 60s(max-age=60)

content-encoding

📦 Gzip(gzip)

content-language

de-DE

content-length

29177

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (2)

mx.dfg.de

dfg-de.mail.protection.outlook.com

Domain Information

dfg.de

Last Updated

03.04.2018

DNSSEC

Not Enabled

Privacy & Compliance

OneTrust

Cookie Consent Banner

OneTrust

GDPR Indicators

Cookie consent banner detected

CMP: OneTrust

Data Protection Officer mentioned

Typography & Readability

Roboto

70/100

Readability

/30

32/40

26px · LH 1.23

Hierarchy

/20

8/25

1x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Roboto

Sans26px

Body Font

Roboto

Sans26px

Contrast Ratio

Reading Comfort

~41 CPL

Needs attention

26px

20px

26px

✅ Excellent readability: 26px body text is ideal for all devices.

⚠️ Weak hierarchy: Headlines should be at least 2x body size for clear visual structure.

✅ Excellent performance: System fonts eliminate font loading delays (better LCP).

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

⚠️ Cramped layout: 68 elements lack adequate spacing.

✅ Clean layout: Consistent left alignment throughout.

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

3 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(2)

Website Identity

Instagram LinkedIn YouTube Bluesky

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Last analyzed: 17 Feb 2026 at 16:07

Historical Analysis & Change Tracking