mainframe.io

https://mainframe.io· First analyzed 01 Jun 2026· Updated 01 Jun 2026

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mainframe.io

Mobile

Sponsored

Hosting Provider

netcup GmbH

IP Address

202.61.243.235

Site Location

🇩🇪 Oldenburg, Germanyvia schema_nap

Server Location

🇩🇪 Nuremberg, Germany

ASN

AS197540

Organization

netcup GmbH

Server

Nginx

CDN

Fastly

Nameservers

ns2.kreativitaet-trifft-technik.de.ns.kreativitaet-trifft-technik.de.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

656 ms10%

Speed Index

853 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

675 KB

19 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Tailwind CSS

Infrastructure

Platform

GitHub Pages

CDN

Fastly

Technology Stack

2 Technologies Detected

CSS Frameworks

Tailwind CSS

Web Servers

Nginxv1.22.1

SEO Analysis

C66/100

Meta Tags5/15

Content10/12

Headings1/8

Technical19/25

E-E-A-T5/7

Images3/7

Links5/5

URL5/5

Social4/5

Freshness2/4

Mobile4/4

Indexability3/3

mainframe.iomainframe.io

Mainframe

Website des Hackspace Mainframe

Title Length9 chars

Recommended: 50-60 chars (~59px / 580px)

Description Length31 chars

Recommended: 120-160 chars

Issues (1)

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

10 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

6,150 URLs

robots.txt

4 rules

Sitemap reference found

Allows all crawlers

Local SEO

Local Search Readiness

31/100

Needs Work

9 11

Sponsored

AI & LLM Readiness

D43/100

Bot Access

20/25

Machine Read.

10/25

Schema Data

2/25

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

navheader/footer

Text ratio:6%

Words:336

Token eff.:Optimal

Sections/1K:11.9

Depth:2/5

Structured Data

1 JSON-LD

Organization×1.1

Citation Readiness

Opening Summary11w

Descriptive Headingsavg 2w

Canonical URL

Open Graph2/3

Twitter Card2/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (9)

AI readiness recommendation preview...

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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.

78/100

Passed

Critical

Warnings

Images & Alt Text

20/20

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

Semantic Structure

13/20

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

6/15

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

2 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.

77/100

68 mg

CO₂e / view

675.0 KB

Page Weight

80%

Cleaner Than

New Visitor

78 mg

Returning (cached)

39 mg

Annual (10K/mo)

8.2 kg

Emission Segments

Data Center

3 mg

Network

20 mg

Device

45 mg

Resource Breakdown

JavaScript

27.6 KB

Images

605.9 KB

CSS

33.8 KB

HTML

5.4 KB

Other

2.3 KB

Green Hosting Verified

netcup GmbH

GWF Verified

3 recommendations

•Carbon footprint recommendation preview...

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Security Score

71%Good

Static / Informational

HTTPS

No WAF

54d

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

27.04.2026

Valid Until

26.07.2026

Subject Alternative Names (8)

kreativitaet-trifft-technik.dektt-ol.demainframe.iowww.kreativitaet-trifft-technik.dewww.ktt-ol.dewww.mainframe.iowww.xn--kreativitt-trifft-technik-tec.dexn--kreativitt-trifft-technik-tec.de

SHA-256 Fingerprint

C9:FF:08:0C:F5:DA:D1:2D:0E:79:83:2A:3A:FA:98:3F:0E:FD:EA:D5...

Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

access-control-allow-origin

age

cache-control

🟡 600s(max-age=600)

connection

keep-alive

content-encoding

📦 Gzip(gzip)

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

mail.kreativitaet-trifft-technik.de

Domain Information

mainframe.io

Domain Age

13y 7m

Created

16.10.2012

Expires

16.10.2026

Last Updated

30.11.2025

Registrar

OVH SAS

DNSSEC

Not Enabled

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.

69/100

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

1 recommendation

•Mobile compatibility recommendation preview...

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Typography & Readability

-apple-system

WCAG Partial

61/100

Readability

/30

22/30

16px · LH 1.50

Hierarchy

/20

7/20

WCAG

/25

12/25

1:1 min contrast

Performance

/25

20/25

System fonts

Heading Font

-apple-system

Sans

Body Font

-apple-system

Sans16px

Contrast Ratio

1:1

28 issues

Reading Comfort

~34 CPL

Narrow lines

24px

21px

16px

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

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

⚠️ Hard to read: Flesch score 46/100. Simplify sentences for wider reach.

⚠️ Partial contrast: 28 elements below WCAG AA threshold (min 1.0:1).

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

❌ Pure vw font sizes: Viewport units alone break browser zoom (WCAG 1.4.4 fail). Use clamp(rem, vw, rem).

Flesch 46

Color Palette

8 unique colors

5.06:1 AA Dark

#222222

Other· 45.5%

#909381

Secondary· 6.9%

#c1caac

Primary· 5.6%

#5f4d3b

Secondary· 3.1%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

3 Resources

Scripts

Styles

Async

Defer

Top Script Sources

.(2)

Website Identity

Mainframe

Organization

Hackspace Oldenburg

[email protected]

+49441-559 700 32

www.mainframe.io

13 years old

Bahnhofsplatz 10, Oldenburg

26122, Oldenburg, Innenstadt

Location detected: 🇩🇪 Germany, Oldenburgvia schema_nap

OVH SASde

Sponsored

Last analyzed: 01 Jun 2026 at 20:29

Historical Analysis & Change Tracking