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heidelberg.de

https://heidelberg.de· First analyzed 28 Apr 2026· Updated 28 Apr 2026
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heidelberg.de
Desktop screenshot of heidelberg.de
Mobile screenshot of heidelberg.de
Mobile

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Hosting Provider

civillent GmbH

IP Address

194.76.38.34

Site Location

🇩🇪 Marktplatz 10, 69117 Heidelberg, Deutschland, Germanyvia tld

Server Location

🇩🇪 Frankfurt am Main, Germany

ASN

AS50964

Organization

civillent GmbH

Server

Apache

Nameservers

dns3.belwue.de.dns.uni-heidelberg.de.dns1.belwue.de.dns5.belwue.de.

Performance

82

Core Web Vitals

Weight

First Contentful Paint
2.0 s10%
Speed Index
2.6 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
8.8 MB
83 requests

Image Optimization

Responsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Frontend
Styling
Bootstrap
Infrastructure
Hosting
civillent GmbH

Technology Stack

8 Technologies Detected

Libraries

3
jQueryv3.6.4
jQuery UI
Lightbox

UI Components

1
Swiper

CSS Frameworks

1
Tailwind CSS

Icon Libraries

1
Font Awesome

Analytics

1
Matomo

Web Servers

1
Apache

SEO Analysis

D58/100
15
10
1
Meta Tags7/15
Content11/12
Headings3/8
Technical14/25
E-E-A-T3/7
Images3/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile4/4
Indexability3/3
H
heidelberg.deheidelberg.de

Startseite | Heidelberg

Die offizielle Website der Stadt Heidelberg und Ihr digitales Rathaus - vereinbaren Sie hier Online-Termine in den Bürgerämtern und erfahren Sie alles zu Ver...

Description truncated.
Title Length23 chars

Recommended: 50-60 chars (~133px / 580px)

Description Length302 chars

Recommended: 120-160 chars

Issues (1)

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

11 issues found

Upgrade to view details

Crawlability

Sitemap
robots.txt

9 rules

Local SEO

Local Search Readiness

21/100
Needs Work
6 12 2

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AI & LLM Readiness

D40/100
Bot Access
20/25
Machine Read.
9/25
Schema Data
0/25
Citation
11/25

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
nav
Text ratio:11%
Words:2,733
Token eff.:Optimal
Sections/1K:1.1
Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary28w
Descriptive Headingsavg 2.5w
Canonical URL
Open Graph0/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (9)
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.
B
70/100
12
Passed
5
Critical
3
Warnings
Images & Alt Text
15/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
13/20
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
9/15
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.
5 recommendations
  • •Accessibility recommendation preview...
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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.
9/100
F
1.11 g
CO₂e / view
8.8 MB
Page Weight
5%
Cleaner Than
New Visitor
1.27 g
vs
Returning (cached)
636 mg
Annual (10K/mo)
133.6 kg
Emission Segments
Data Center
249 mg
Network
267 mg
Device
597 mg
Resource Breakdown
JavaScript
526.6 KB
Images
7.5 MB
CSS
630.8 KB
HTML
190.2 KB
Other
12.7 KB
Green Hosting Not Verified
civillent GmbH
9 recommendations
  • •Carbon footprint recommendation preview...
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C

Security Score

61%Fair
Interactive

HTTPS

No WAF

80d

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

18.04.2026

Valid Until

17.07.2026

Subject Alternative Names (9)

cms7.heidelberg.euheidelberg.deheidelberg.eustadt-heidelberg.comstadt-heidelberg.netwww.heidelberg.dewww.heidelberg.euwww.stadt-heidelberg.com+1 more

SHA-256 Fingerprint

3E:1A:62:50:DC:DC:A0:21:C8:BF:BD:76:3D:6D:31:F6:83:51:AA:B5...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control
🔴 No Cache(no-store)
content-language
de
content-length
194507
content-type
text/html;charset=UTF-8
date
Tue, 28 Apr 2026 04:30:18 GMT
link
<https://heidelberg.de/HD.html>; rel="canonical"
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

98

SPF
DKIM
DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (4)

mx6.kvnbw.de
mx8.kvnbw.de
mx9.kvnbw.de
mx7.kvnbw.de

Domain Information

heidelberg.de

Last Updated

14.12.2017

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected
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.
C
68/100
Mobile Friendly1 breakpoint
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, maximum-scale=5, shrink-to-fit=no
3 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Open Sans

WCAG Partial
67/100
Readability
/30
25/30

16px · LH 1.50

Hierarchy
/20
7/20
WCAG
/25
17/25

1:1 min contrast

Performance
/25
18/25

1 font · 5 req

Heading Font

Open Sans

Sans

Body Font

Open Sans

Sans16px

Contrast Ratio

1:1

15 issues

Reading Comfort

~36 CPL

Narrow lines
55px
h2
26px
h3
22px
h4
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 23/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 15 elements below WCAG AA threshold (min 1.0:1).

❌ Missing H1: Every page should have exactly one H1 element for SEO and accessibility.

✅ Modern fluid typography: clamp() with rem units ensures zoom accessibility (WCAG 1.4.4).

Buy on MyFontsFluid Type (rem)Flesch 23

Color Palette

11 unique colors
20.87:1 AAA Light
#ffffff
Background· 17%
#010101
Text· 7.3%
#780039
Primary· 15.100000000000001%
#411226
Accent· 0.5%

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

30 Resources

20
Scripts
10
Styles
0
Async
0
Defer

Top Script Sources

local(19)static.conword.io(1)

Website Identity

heidelberg.de

stadt@heidelberg.de
Location detected: 🇩🇪 Germany, Marktplatz 10, 69117 Heidelberg, Deutschlandvia tld
de

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Last analyzed: 28 Apr 2026 at 04:30

Historical Analysis & Change Tracking