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opernhaus.ch

https://opernhaus.ch· First analyzed 07 May 2026· Updated 07 May 2026
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opernhaus.ch
Desktop screenshot of opernhaus.ch
Mobile screenshot of opernhaus.ch
Mobile

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Hosting Provider

Voltimum SA

IP Address

217.150.245.184

Site Location

🇨🇭 Switzerlandvia tld

Server Location

🇨🇭 Zurich, Switzerland

ASN

AS29691

Organization

Voltimum SA

Server

Apache

Nameservers

ns6.nine.ch.ns5.nine.ch.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
401 ms10%
Speed Index
521 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
1.9 MB
31 requests

Image Optimization

Lazy LoadWebP
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Voltimum SA

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

8 Technologies Detected

Analytics

3
Google Analytics
Google Analytics 4
Facebook Pixel

Libraries

1
jQuery

Other

1
Modernizr

CSS Frameworks

1
Tailwind CSS

Advertising

1
Twitter Ads

Web Servers

1
Apache

SEO Analysis

C62/100
17
7
3
Meta Tags12/15
Content3/12
Headings3/8
Technical21/25
E-E-A-T3/7
Images2/7
Links5/5
URL5/5
Social4/5
Freshness0/4
Mobile1/4
Indexability3/3
O
opernhaus.chopernhaus.ch

Opernhaus Zürich - Official Website

Das Opernhaus Zürich im Internet – Spielpläne für Oper, Ballett und Konzerte. Alles über die Werke, Künstler, Preise, Tickets, Abonnements und Service.

Title Length35 chars

Recommended: 50-60 chars (~214px / 580px)

Description Length151 chars

Recommended: 120-160 chars

Issues (3)

  • • Very thin content (29 words). Search engines need substantial content for ranking.
  • • Missing H1 tag — every page should have exactly one H1
  • • Most images missing alt text (23/27) — critical for accessibility and SEO

10 issues found

Upgrade to view details

Crawlability

Sitemap
robots.txt

7 rules

Local SEO

Local Search Readiness

12/100
Poor
3 13 1

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

D43/100
Bot Access
20/25
Machine Read.
10/25
Schema Data
3/25
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
nav
Text ratio:1%
Words:815
Token eff.:Optimal
Depth:1/5

Structured Data

6 JSON-LD
Organization×1.1Event

Citation Readiness

Opening Summary
Descriptive Headings
Canonical URL
Open Graph3/3
Twitter Card1/3
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.
C
62/100
8
Passed
4
Critical
0
Warnings
Images & Alt Text
10/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
10/20
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
3/15
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.
45/100
D
247 mg
CO₂e / view
1.9 MB
Page Weight
50%
Cleaner Than
New Visitor
282 mg
vs
Returning (cached)
141 mg
Annual (10K/mo)
29.6 kg
Emission Segments
Data Center
55 mg
Network
59 mg
Device
132 mg
Resource Breakdown
JavaScript
180.4 KB
Images
1.2 MB
CSS
485.2 KB
HTML
140.4 KB
Green Hosting Not Verified
Voltimum SA
3 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
B

Security Score

76%Good
Static / Informational

HTTPS

No WAF

45d

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

23.03.2026

Valid Until

21.06.2026

Subject Alternative Names (20)

2526.opernhaus.chatto-primo.chattoprimo.chballett-fuer-alle.chballettfueralle.chbernadette.chclub-jung.chclubjung.ch+12 more

SHA-256 Fingerprint

58:2E:EB:90:AC:5B:BD:88:F4:84:66:06:79:B3:58:74:BD:A2:E9:77...

Recommendations

Security recommendation preview

Upgrade to view recommendations
Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges
bytes
content-encoding
📦 Gzip(gzip)
content-security-policy
frame-ancestors 'self' http://opernhaus.ch https://backstage...
content-type
text/html; charset=UTF-8
date
Thu, 07 May 2026 10:15:05 GMT
etag
"62eb6-6513735650cd3-gzip"
Good Warning Issue

Email Infrastructure

Microsoft 365

Score

93

SPF
DKIM
DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

opernhaus-ch.mail.protection.outlook.com

Domain Information

opernhaus.ch

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 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
2 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

KlarheitKurrent + LinetoBrownproLight

WCAG Partial
54/100
Readability
/30
20/30

20px · LH 1.25

Hierarchy
/20
7/20
WCAG
/25
16/25

1.43:1 min contrast

Performance
/25
11/25

3 fonts · 3 req

Heading Font

KlarheitKurrent

Sans

Body Font

LinetoBrownproLight

Sans20px

Contrast Ratio

1.43:1

1 issue

Reading Comfort

~39 CPL

Narrow lines
140px
h2
28px
h3
20px
p

✅ Excellent readability: 20px body text is ideal for all devices.

⚠️ Tight line spacing (1.25). Increase to 1.4–1.6 for better readability.

❌ Very complex text: Flesch score 15/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 1 elements below WCAG AA threshold (min 1.4:1).

❌ 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 15

Color Palette

8 unique colors
Light
#ffffff
Primary· 3.5%
#003227
Accent· 80.60000000000001%
#ae91f0
Accent· 4.2%
#8e7dc6
Secondary· 3%
#5f628f
Secondary· 2.5%
#c8a9f4
Accent· 2.1%
#38d0dd
Accent· 2.1%
#274a5b
Secondary· 2%

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

7 Resources

6
Scripts
1
Styles
0
Async
0
Defer

Top Script Sources

local(6)

Website Identity

La clemenza di Tito

Event

Wolfgang Amadeus Mozart Opera seria in zwei Akten Libretto von Caterino Mazzolà nach Pietro Metastasio

www.opernhaus.ch/spielplan/kalendarium/la-clemenza-di-tito-1/2025-2026/
Location detected: 🇨🇭 Switzerlandvia tld
📧 Microsoft 365de

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Last analyzed: 07 May 2026 at 10:15

Historical Analysis & Change Tracking