seilnacht.com

https://seilnacht.com· First analyzed 20 May 2026· Updated 20 May 2026

Export

seilnacht.com

Mobile

Sponsored

Hosting Provider

1blu GmbH

IP Address

195.90.221.194

Site Location

🇩🇪 Germanyvia ip

Server Location

🇩🇪 Berlin, Germany

ASN

AS42730

Organization

1blu GmbH

Server

Nginx

Nameservers

ns2.i-st.net.ns.i-st.net.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

311 ms10%

Speed Index

404 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

126 KB

21 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

1blu GmbH

Technology Stack

1 Technologies Detected

Web Servers

Nginx

SEO Analysis

D52/100

Meta Tags12/15

Content7/12

Headings0/8

Technical9/21

E-E-A-T3/7

Images4/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

seilnacht.comseilnacht.com

SEILNACHT - Naturwissenschaften unterrichten

Naturwissenschaften verstehen - Unterricht vorbereiten und kreativ gestalten

Title Length44 chars

Recommended: 50-60 chars (~269px / 580px)

Description Length76 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag — every page should have exactly one H1

11 issues found

Upgrade to view details

Local SEO

Local Search Readiness

3/100

Poor

1 14 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

Sponsored

AI & LLM Readiness

F26/100

Bot Access

20/25

Machine Read.

1/25

Schema Data

0/25

Citation

5/25

AI Bot Access

14/14 accessible

AI Search

OAI-SearchBot

PerplexityBot

Claude-SearchBot

Gemini-Deep-Research

DuckAssistBot

Training

GPTBot

ClaudeBot

Google-Extended

Meta-ExternalAgent

Bytespiderinfo

Amazonbot

Applebot-Extended

CCBotinfo

Fetch

ChatGPT-User

Machine Readability

llms.txt

llms-full.txt

Semantic HTML

Heading Hierarchy

Text ratio:5%

Words:53

Token eff.:Too Short

Structured Data

No Schema

Citation Readiness

Opening Summary

Descriptive Headings

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (11)

AI readiness recommendation preview...

Upgrade to view recommendations

Sponsored

Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.

66/100

Passed

Critical

Warnings

Images & Alt Text

20/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

6/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

15/15

Verifies form fields have labels, error messages are clear, and inputs are properly associated.

Color & Contrast

15/15

Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.

Keyboard & Focus

9/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

1/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

2 recommendations

•Accessibility recommendation preview...

Upgrade to view recommendations

Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.

59/100

A+

16 mg

CO₂e / view

126.4 KB

Page Weight

95%

Cleaner Than

New Visitor

18 mg

Returning (cached)

9 mg

Annual (10K/mo)

1.9 kg

Emission Segments

Data Center

4 mg

Network

4 mg

Device

8 mg

Resource Breakdown

Images

123.7 KB

CSS

570 B

HTML

2.2 KB

Green Hosting Not Verified

1blu GmbH

3 recommendations

•Carbon footprint recommendation preview...

Upgrade to view recommendations

Security Score

71%Good

Static / Informational

HTTPS

No WAF

86d

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

17.05.2026

Valid Until

15.08.2026

Subject Alternative Names (2)

seilnacht.comwww.seilnacht.com

SHA-256 Fingerprint

EB:AF:E2:61:44:E9:A2:66:BD:D8:5D:E2:82:AD:07:8B:86:11:C7:C8...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

content-encoding

⚡ Brotli(br)

content-type

text/html

date

Wed, 20 May 2026 15:52:11 GMT

etag

W/"69875dca-2228"

last-modified

Sat, 07 Feb 2026 15:44:10 GMT

server

nginx

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

mail.seilnacht.com

Domain Information

seilnacht.com

Domain Age

24y 5m

Created

04.12.2001

Expires

04.12.2026

Last Updated

05.12.2025

Registrar

EPAG Domainservices GmbH

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.

47/100

Not Mobile Friendly

Viewport Meta

The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.

Responsive Design

Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.

Touch Icons

Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.

Readable Font Size

Base font size should be at least 16px on mobile to ensure text is readable without zooming.

Relative Units

Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.

No H-Scroll Risk

No elements wider than the viewport that would cause horizontal scrolling on mobile devices.

Tap Targets OK

Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.

No Fixed Widths

No elements with fixed pixel widths that could overflow on smaller screens and break the layout.

Viewport

width=device-width, initial-scale=1.0, user-scalable=yes

4 recommendations

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

Times New Roman

WCAG AAA

67/100

Readability

/30

19/30

16px · LH --

Hierarchy

/20

10/20

WCAG

/25

24/25

12.61:1 min contrast

Performance

/25

14/25

1 font

Heading Font

Times New Roman

Body Font

Times New Roman

Serif16px

Contrast Ratio

12.61:1

WCAG AAA (≥7:1)

Reading Comfort

Single Family

left aligned

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

❌ Very complex text: Flesch score 13/100. Consider shorter sentences and simpler words.

✅ WCAG AAA contrast: All text meets 7:1 ratio (min 12.6:1).

✅ Lean font stack: 1 font families keeps load times fast.

⚠️ Missing font-display: swap — users may see invisible text while fonts load (FOIT).

Buy on MyFontsFlesch 13

Color Palette

9 unique colors

Light

#aaaaaa

Other· 58.4%

#0b0d14

Primary· 6.9%

#6e4a53

Secondary· 3.9%

#ae9684

Secondary· 2.7%

Sponsored

Scripts & Styles

1 Resources

Scripts

Styles

Async

Defer

Top Script Sources

Website Identity

seilnacht.com

24 years old

Location detected: 🇩🇪 Germanyvia ip

EPAG Domainservices GmbHde

Sponsored

Last analyzed: 20 May 2026 at 15:52

Historical Analysis & Change Tracking