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sielmann-stiftung.de

https://sielmann-stiftung.de· First analyzed 17 May 2026· Updated 17 May 2026
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sielmann-stiftung.de
Desktop screenshot of sielmann-stiftung.de
Mobile screenshot of sielmann-stiftung.de
Mobile

Sponsored

Hosting Provider

NETCUP-KVM

IP Address

159.195.62.119

Site Location

🇩🇪 Germanyvia phone

Server Location

🇩🇪 Nuremberg, Germany

ASN

AS197540

Organization

NETCUP-KVM

Server

Nginx

Nameservers

ns45.domaincontrol.com.ns46.domaincontrol.com.

Performance

97

Core Web Vitals

Weight

First Contentful Paint
959 ms10%
Speed Index
1.2 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
10.4 MB
90 requests

Image Optimization

Lazy LoadResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
TYPO3

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

8 Technologies Detected

Frameworks

1
Angular

Libraries

1
jQuery

Other

1
D3.js

UI Components

1
Lightbox

CSS Frameworks

1
Tailwind CSS

Analytics

1
Google Analytics

Tag Managers

1
Google Tag Manager

Web Servers

1
Nginx

SEO Analysis

B70/100
19
8
1
Meta Tags12/15
Content11/12
Headings6/8
Technical18/25
E-E-A-T0/7
Images3/7
Links5/5
URL5/5
Social4/5
Freshness0/4
Mobile3/4
Indexability3/3
S
sielmann-stiftung.desielmann-stiftung.de

Natur bewahren: Heinz Sielmann Stiftung – Ihr Partner für Artenschutz

Seit 30 Jahren schützt die Heinz Sielmann Stiftung Natur und Artenvielfalt durch den Erhalt großer Lebensräume. Jetzt entdecken und unterstützen!

Title Length69 chars

Recommended: 50-60 chars (~420px / 580px)

Description Length146 chars

Recommended: 120-160 chars

Issues (1)

  • • Most images missing alt text (20/22) — critical for accessibility and SEO

9 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

5 URLs

5 sub-sitemaps

robots.txt

7 rules

Sitemap reference found

Local SEO

Local Search Readiness

15/100
Poor
4 11 2

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

Sponsored

AI & LLM Readiness

D41/100
Bot Access
20/25
Machine Read.
7/25
Schema Data
0/25
Citation
14/25

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:1,881
Token eff.:Optimal
Sections/1K:0.5

Structured Data

No Schema

Citation Readiness

Opening Summary32w
Descriptive Headingsavg 3.7w
Canonical URL
Open Graph3/3
Twitter Card3/3
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.
C
68/100
10
Passed
4
Critical
3
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
15/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
7/15
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
7/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
4/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
3 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.
38/100
F
1.08 g
CO₂e / view
10.4 MB
Page Weight
5%
Cleaner Than
New Visitor
1.23 g
vs
Returning (cached)
617 mg
Annual (10K/mo)
129.5 kg
Emission Segments
Data Center
53 mg
Network
317 mg
Device
709 mg
Resource Breakdown
JavaScript
262.3 KB
Images
61.4 KB
CSS
10.0 MB
HTML
40.9 KB
Other
28.8 KB
Green Hosting Verified
netcup GmbH
GWF Verified
4 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
F

Security Score

31%Critical
Interactive

HTTPS

No WAF

87d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

15.05.2026

Valid Until

13.08.2026

Subject Alternative Names (2)

sielmann-stiftung.dewww.sielmann-stiftung.de

SHA-256 Fingerprint

5B:99:DB:6C:38:39:B6:15:18:58:55:7C:8C:65:B4:66:9B:09:11:C1...

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

cache-control
🟡 0s(max-age=0)
content-encoding
📦 Gzip(gzip)
content-language
de
content-type
text/html; charset=utf-8
date
Sun, 17 May 2026 18:29:24 GMT
expires
Sun, 17 May 2026 18:29:24 GMT
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

73

SPF
DKIM
DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

mail.sielmann-stiftung.de

Domain Information

sielmann-stiftung.de

Last Updated

08.01.2026

DNSSEC
Not Enabled

Privacy & Compliance

CookieFirst

Cookie Consent Banner
CookieFirst
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected
CMP: CookieFirst
Privacy policy page linked

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.
A
85/100
Mobile Friendly172 breakpoints
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
1 recommendation
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Open Sans

WCAG Partial
66/100
Readability
/30
19/30

16px · LH 2.00

Hierarchy
/20
17/20

4x ratio

WCAG
/25
12/25

1:1 min contrast

Performance
/25
18/25

1 font · 5 req

Heading Font

Open Sans

Sans64px

Body Font

Open Sans

Sans16px

Contrast Ratio

1:1

18 issues

Reading Comfort

~42 CPL

Narrow lines
64px
h1
64px
h2
32px
h3
16px
p

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

⚠️ Wide line spacing (2.00). 1.4–1.6 is optimal for body text.

❌ Very complex text: Flesch score 21/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 18 elements below WCAG AA threshold (min 1.0:1).

⚠️ Minor heading issue: 0 level skip(s) detected. Maintain sequential order for screen readers.

✅ Strong hierarchy: Headlines are 4.0x larger than body text.

Buy on MyFontsFlesch 21

Color Palette

6 unique colors
Dark
#1b191a
Text· 58.89999999999999%
#efddc1
Accent· 14%
#ffffff
Primary· 0%
#ddcab1
Secondary· 8.3%
#a1978a
Secondary· 3.1%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

2
Google Tag ManagerFree
Google AnalyticsFree

User behavior and product analytics

1

Categories

2

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

Sponsored

Scripts & Styles

23 Resources

20
Scripts
3
Styles
11
Async
0
Defer

Top Script Sources

local(17)consent.cookiefirst.com(2)googletagmanager.com(1)

Website Identity

sielmann-stiftung.de

+4955279140
Location detected: 🇩🇪 Germanyvia phone
de

Sponsored

Last analyzed: 17 May 2026 at 18:29

Historical Analysis & Change Tracking