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heizspiegel.de

https://heizspiegel.de· First analyzed 24 May 2026· Updated 24 May 2026
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heizspiegel.de
Desktop screenshot of heizspiegel.de
Mobile screenshot of heizspiegel.de
Mobile

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Hosting Provider

Cronon GmbH

IP Address

85.215.11.226

Site Location

🇩🇪 Germanyvia tld

Server Location

🇩🇪 Berlin, Germany

ASN

AS6786

Organization

Cronon GmbH

Server

Apache

CDN

CDN

Nameservers

ns.udag.net.ns.udag.de.ns.udag.org.

Performance

99

Core Web Vitals

Weight

First Contentful Paint
694 ms10%
Speed Index
902 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
459 KB
35 requests

Image Optimization

Lazy Load
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
TYPO3

Technology Stack

4 Technologies Detected

Analytics

2
Google Analytics
Segment

CSS Frameworks

1
Tailwind CSS

Web Servers

1
Apache

SEO Analysis

C66/100
17
7
1
Meta Tags14/15
Content11/12
Headings7/8
Technical14/25
E-E-A-T0/7
Images2/7
Links2/5
URL5/5
Social5/5
Freshness0/4
Mobile3/4
Indexability3/3
H
heizspiegel.deheizspiegel.de

Heizspiegel: Das Portal zum Heizkosten senken | Heizspiegel

Heizkosten senken leicht gemacht. Heizenergieverbrauch deutschlandweit vergleichen, Heizkostenabrechnung prüfen lassen, Energieverbrauch berechnen & Tipps um...

Description truncated.
Title Length59 chars

Recommended: 50-60 chars (~346px / 580px)

Description Length164 chars

Recommended: 120-160 chars

Issues (1)

  • • Most images missing alt text (5/8) — critical for accessibility and SEO

8 issues found

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Crawlability

Sitemap
robots.txt

5 rules

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.

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AI & LLM Readiness

F37/100
Bot Access
20/25
Machine Read.
7/25
Schema Data
0/25
Citation
10/25

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:4%
Words:808
Token eff.:Optimal

Structured Data

No Schema

Citation Readiness

Opening Summary424w
Descriptive Headingsavg 7.6w
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...
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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.
B
75/100
12
Passed
5
Critical
1
Warnings
Images & Alt Text
18/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
17/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
10/15
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
8/15
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.
58/100
A
57 mg
CO₂e / view
458.9 KB
Page Weight
90%
Cleaner Than
New Visitor
65 mg
vs
Returning (cached)
32 mg
Annual (10K/mo)
6.8 kg
Emission Segments
Data Center
13 mg
Network
14 mg
Device
31 mg
Resource Breakdown
JavaScript
245.2 KB
Images
34.5 KB
CSS
102.4 KB
HTML
10.0 KB
Other
66.8 KB
Green Hosting Not Verified
Cronon GmbH
4 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
F

Security Score

21%Critical
Interactive

HTTPS

No WAF

85d

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/1.1

Valid From

19.05.2026

Valid Until

17.08.2026

Subject Alternative Names (2)

heizspiegel.dewww.heizspiegel.de

SHA-256 Fingerprint

1B:24:16:5D:A9:9D:19:BD:6A:D8:E0:4E:16:57:FD:87:FB:30:CA:94...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges
bytes
age
571
cache-control
🟡 0s(max-age=0)
content-encoding
📦 Gzip(gzip)
content-language
de
content-length
9912
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

20

SPF
DKIM
DMARC

MX Records (1)

mail.senercon.de

Domain Information

heizspiegel.de

Last Updated

03.08.2022

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

GDPR Indicators

Privacy policy page linked
Data Protection Officer mentioned

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.
B
74/100
Mobile Friendly10 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=1.0
1 recommendation
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Roboto

WCAG Partial
69/100
Readability
/30
25/30

16px · LH 1.50

Hierarchy
/20
14/20

2.25x ratio

WCAG
/25
12/25

1:1 min contrast

Performance
/25
18/25

System fonts

Heading Font

Roboto

Sans36px

Body Font

Roboto

Sans16px

Contrast Ratio

1:1

24 issues

Reading Comfort

~38 CPL

Narrow lines
36px
h1
32px
h2
33px
h3
16px
p

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

✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

❌ Very complex text: Flesch score 25/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 24 elements below WCAG AA threshold (min 1.0:1).

❌ Broken heading hierarchy: 2 level skip(s). Screen readers rely on sequential headings (h1→h2→h3).

✅ Strong hierarchy: Headlines are 2.2x larger than body text.

Flesch 25

Color Palette

6 unique colors
Light
#ffffff
Background· 42.4%
#e9f3f7
Secondary· 39.5%
#085075
Primary· 7.1%
#7fa4b2
Secondary· 5%
#504a61
Border· 3.3%
#d5e1e6
Secondary· 2.7%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

1
Google AnalyticsFree

User behavior and product analytics

1

Categories

1

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

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Scripts & Styles

13 Resources

9
Scripts
4
Styles
3
Async
3
Defer

Top Script Sources

heizspiegel.de(4)cloud.ccm19.de(2)download.digiaccess.org(2)ratgeber.co2online.de(1)

Website Identity

heizspiegel.de

Location detected: 🇩🇪 Germanyvia tld
de

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Last analyzed: 24 May 2026 at 07:26

Historical Analysis & Change Tracking