What technology does sdui.app use?

We did not detect any specific technologies for sdui.app in the latest scan.

Is sdui.app secure (HTTPS)?

Yes. sdui.app uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Oct 21, 2026.

Hosting provider information for sdui.app is not available yet.

What is sdui.app's SEO score?

sdui.app scored 65/100 for SEO in the latest analysis (fair).

What is sdui.app's overall website score?

sdui.app has an overall SiteGraph score of 83/100, combining SEO, performance, security, and accessibility.

Has sdui.app's score changed over time?

sdui.app's overall score has improved by 1 point (from 82 to 83) since Jul 26, 2026.

sdui.app

Sdui

Last scanned Aug 3, 2026, 11:00 AM · 7 views

Overall score

Great

Summary

Sdui ist die sichere Plattform für Kommunikation und Organisation an Schulen: Mit Stundenplan, Vertretungen, Cloud & mehr. SEO is fair (65/100) and accessibility is excellent (90/100). Security scores good (80/100) and performance excellent (100/100). Top issue: Missing canonical link.

Sdui ist die sichere Plattform für Kommunikation und Organisation an Schulen: Mit Stundenplan, Vertretungen, Cloud & mehr. Jetzt Schule suchen und einloggen!

Top issues to fix

7 issues found · 2 high priority

Missing Strict-Transport-Security header
Security
Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
No H1 heading found
SEO
Add exactly one H1 describing the page's main topic — it anchors the document outline for search engines and screen readers.
Missing X-Frame-Options header
Security
Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Missing canonical link
SEO
Add <link rel="canonical"> so search engines know which URL variant to index.
No structured data (JSON-LD) found
SEO
Add JSON-LD (Organization, Article, Product…) to become eligible for rich results.
robots.txt not found
SEO
Publish /robots.txt with a Sitemap: directive to guide crawlers.

+1 more issue — details in the sections below.

SEO

5 issue(s) found

100

Performance

169 ms

Security

HTTPS & header checks

Accessibility

1 issue(s) found

Score history

+1 overall since Jul 26, 2026

Overall: 83
SEO: 65
Security: 80
Performance: 100
Accessibility: 90

Organization

Company details published in this site's own structured data.

Sdui ist die sichere Plattform für Kommunikation und Organisation an Schulen: Mit Stundenplan, Vertretungen, Cloud & mehr. Jetzt Schule suchen und einloggen!

Meta tags

Title: Sdui
Description: Sdui ist die sichere Plattform für Kommunikation und Organisation an Schulen: Mit Stundenplan, Vertretungen, Cloud & mehr. Jetzt Schule suchen und einloggen!
Canonical
Language: de
Charset: utf-8
Viewport: width=device-width, viewport-fit=cover, initial-scale=1, maximum-scale=1, user-scalable=0, shrink-to-fit=no
Robots meta: all
Manifest: https://sdui.app/manifest.json

Technologies

Detected frameworks, languages, and tools.

No technologies detected.

Hosting & CDN

Hosting provider: —
CDN provider: —
IP address: —
ASN: —

DNS records

Type	Value
A	—
AAAA	—
MX	—
TXT	—
NS	—
CAA	—
CNAME	—
IPv6 support	No

TLS / SSL certificate

Version: TLS 1.3
Issuer: Let's Encrypt
Subject: sdui.app
Valid from: Jul 23, 2026
Valid to: Oct 21, 2026
Days until expiry: 79
SAN domains: app.sdui.de, beta.app.sdui.de, connect.pupil.ch, sdui.app

Security headers

Strict-Transport-SecurityMissing
Content-Security-PolicyEnabled
X-Frame-OptionsMissing
X-Content-Type-OptionsEnabled
Referrer-PolicyEnabled
Permissions-PolicyEnabled

Compression: gzip · 1 cookie(s) observed

Content & assets

Headings

H1 0 · H2 0 · H3 0

Links

0 internal · 0 external · 0 broken

Images

0 total · 0 missing alt

Scripts / Styles

9 scripts · 4 stylesheets

JS / CSS size

2.1 KB · 491 B

Page size

7.1 KB

Robots.txt & Sitemap

robots.txt: Not found
Disallow rules: 0
sitemap.xml: Not found
URLs in sitemap: 0

SEO issues

Missing canonical link
No H1 heading found
No structured data (JSON-LD) found
robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://sdui.app
Final URL: https://sdui.app
HTTP status: 200
HTTP version: HTTP/2
Response time: 169 ms
HTML size: 7.1 KB
Redirect chain: https://sdui.app

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Frequently asked questions

What technology does sdui.app use?: We did not detect any specific technologies for sdui.app in the latest scan.
Is sdui.app secure (HTTPS)?: Yes. sdui.app uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Oct 21, 2026.
Who hosts sdui.app?: Hosting provider information for sdui.app is not available yet.
What is sdui.app's SEO score?: sdui.app scored 65/100 for SEO in the latest analysis (fair).
What is sdui.app's overall website score?: sdui.app has an overall SiteGraph score of 83/100, combining SEO, performance, security, and accessibility.
Has sdui.app's score changed over time?: sdui.app's overall score has improved by 1 point (from 82 to 83) since Jul 26, 2026.