ZUGFeRD Validator

Gehostete REST API & MCP-Client zur automatisierten Validierung von ZUGFeRD, Factur-X und XRechnung E-Rechnungen gegen EN 16931.

Developer Tools

Estimated origin: Germany

Added April 9, 2026 · Last analysed April 11, 2026 · via · 67% unique tagline

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StackScope is a free public catalogue of indie launches. We find launches on Product Hunt, Hacker News and similar feeds, then crawl each site to detect its tech stack and score it for launch readiness: DNS, security headers, SEO basics. This page is what we saw on 11 April 2026; the live site may have changed since.

ZUGFeRD Validator is largely in shape, with a thorough launch checklist and clean crawl signals. Worth fixing first: missing several security headers, incomplete legal pages, and incomplete email security.

Launched on Product Hunt on April 9, 2026. The site is hosted on HETZNER-AS in Germany. The crawl picked up 5 technologies on this site, covering DNS providers, business email, os, and seo. The stack includes Google Search Console, Hetzner DNS, and Hetzner Email.

If you own this site, refresh the snapshot and see the full fix list any time →

6.4

StackScope Score

Good

100/100 Launch Readiness

Launch ready

3/6 Security Headers

Decent

0/3 Legal

Missing

2/2 Crawl files

Complete

Vibe Score 45 · Some AI signals

How much the site looks AI-generated. Informational pattern-match signal, not a verdict. Does not feed the StackScope Score. See which fingerprints fired →

Tech Stack (5)

Infrastructure

DNS	Hetzner DNS
OS	Ubuntu (2)
Server	nginx (2)

Business email	Hetzner Email

Analytics & Marketing

SEO	Google Search Console

Infrastructure

Network

HETZNER-AS, DE

AS24940 · DE

DNS

Hetzner DNS

Authoritative nameserver

DNSSEC

Not enabled

DNS responses unsigned. Cache-poisoning vulnerable.

SSL Certificate

Let's Encrypt

Valid 8 Apr 2026 to 7 Jul 2026

Certificate as captured in this snapshot, not a live check.

Email Security

⚠

SPF ?all Neutral (?all). Monitoring only, no enforcement.

DKIM Not detected at common selectors. Your provider may use a custom one.

✗

DMARC Not published. Receivers fall back to permissive defaults.

MTA-STS Not deployed. Mail to your domain can be downgraded to plaintext en route.

TLS-RPT Not configured. You won't hear about silent SMTP TLS handshake failures.

Readiness Breakdown How?

✓ Custom title and meta description

✓ Open Graph tags (title, image, description)

✓ Twitter card meta tags

✓ Canonical URL declared

✓ Responsive viewport meta tag

✓ Favicon present

✓ Semantic HTML (nav, main, article)

⚠

Meta description is 193 characters (advisory) Google only shows about 155–160 characters of the description in desktop search results (less on mobile); anything past that won't appear.

Vibe Score Breakdown How?

Signal	Points
AI writing signals	+5
AI iconography signals	+5
AI code-structure signals	+5
AI asset signals	+10

This score is based on structural patterns and is not definitive. Many legitimate sites may trigger signals, and AI-built sites may go undetected. It should be treated as an indicator, not a verdict.

AI Stance

Welcomes AI crawlers

✓ llms.txt published

✓ No AI bots blocked in robots.txt

Content-Signal

? No directive declared

Link headers

? None advertised

Well-Known Files

✓ robots.txt

✓ sitemap.xml (5 URLs)

✗ security.txt

✓ llms.txt

✗ ads.txt

✗ humans.txt

Legal

? Privacy Policy not detected

? Terms of Service not detected

Detection works best on English language sites.

Security Headers (3/6)

✓

Referrer-Policy

✓

X-Frame-Options

✗

Permissions-Policy experimental (check browser support)

✓

X-Content-Type-Options

✗

Content-Security-Policy

✗

Strict-Transport-Security

–

X-XSS-Protection deprecated (use Content-Security-Policy)

Performance

168ms response time

Faster than 77% of sites

2 third-party domains loaded

Build

1 JS files

0 CSS files

2 Third-party domains

Brand Colours

Something not look right? If a technology shown here is wrong or out of date, email [email protected] and we'll review it.