Certified Website Score for

jonas-siebler.com

First audit: November 2, 2025•Last audit: November 10, 2025

Visit website

Overall

50Website Quality

35Trust & Security

80PageSpeed

Score trend

Latest audit — November 10, 2025

Deep, transparent insight into how this score is built: PageSpeed vitals, on‑page quality signals, and trust & security checks — all broken down into clear, verifiable items you can act on.

👇Click to open / close

Site Quality

Title

20/20

Jonas Siebler - Software Developer Portfolio

44 chars (ideal 30–60)

Meta Description

0/15

missing (add <meta name='description'> with 120-160 chars)

Favicon

3/3

https://jonas-siebler.com/favicon.ico

present

Viewport meta

8/8

width=device-width, initial-scale=1.0

correct (width=device-width, initial-scale=1)

robots.txt

4/6

# As a condition of accessing this website, you agree to abide by the following # content signals: # (a) If a content-signal = yes, you may collect content for the corresponding # use. # (b) If a content-signal = no, you may not collect content for the # corresponding use. # (c) If the website operator does not include a content signal for a # corresponding use, the website operator neither grants nor restricts # permission via content signal with respect to the correspon...

good (User-agent + Allow, missing Sitemap)

Sitemap

7/7

https://jonas-siebler.com/sitemap.xml

present

Headings

0/6

missing (add H1, H2, H3, H4, H5, H6 tags to structure content)

Schema.org JSON-LD

0/2

missing (consider Organization, Article, Product, or FAQPage schemas)

Canonical URL

0/8

missing (add <link rel='canonical'> to avoid duplicate content)

HTML lang

4/4

present

Character encoding

4/4

UTF-8

present

Open Graph

Title

0/3

missing (add <meta property='og:title'> for social sharing)

Description

0/3

missing (add <meta property='og:description'> for social sharing)

Image

0/3

missing (add <meta property='og:image'> with 1200x630px image)

URL

0/3

missing (add <meta property='og:url'> with full URL)

Type

0/1

missing (add <meta property='og:type' content='website'>)

Twitter Cards

Card Type

0/1

missing

Title

0/1

missing (add <meta name='twitter:title'> for Twitter sharing)

Description

0/1

missing (add <meta name='twitter:description'> for Twitter sharing)

Image

0/1

missing (add <meta name='twitter:image'> with 1200x630px image)

Security Headers

HTTPS

30/30

HTTPS enabled

HTTP Strict Transport Security

0/15

missing (should be: Strict-Transport-Security: max-age=31536000; includeSubDomains)

Content Security Policy

0/15

missing (should be: Content-Security-Policy: default-src 'self')

Frame Protection

0/5

missing (should be: X-Frame-Options: SAMEORIGIN)

MIME Type Protection

5/5

X-Content-Type-Options: nosniff

Domain Trust

Domain Rating

0/25

no domain rating found

Domain Age

0/5

0 years

Registrar

Ascio Technologies, Inc

Country

Infrastructure

Provider

Cloudflare

Performance

SEO

100

Best Practices

Accessibility

Performance

31/100

Largest Contentful Paint

0/25

12.5s

2.5s4.0s

First Contentful Paint

4/10

3.3s

1.8s3.0s

Total Blocking Time

0/30

12.5s

200ms400ms

Cumulative Layout Shift

25/25

0.00

0.100.25

Speed Index

2/10

8.2s

3.4s5.4s

SEO

83/100

Page isn’t blocked from indexing

34/34

Document has a `<title>` element

8/8

Document does not have a meta description

0/8

Page has successful HTTP status code

8/8

Links have descriptive text

8/8

Links are crawlable

8/8

robots.txt is not valid

0/8

Image elements have `[alt]` attributes

8/8

Document has a valid `hreflang`

8/8

Best Practices

100/100

Uses HTTPS

19/19

Avoids deprecated APIs

19/19

Avoids third-party cookies

19/19

Allows users to paste into input fields

12/12

Avoids requesting the geolocation permission on page load

4/4

Avoids requesting the notification permission on page load

4/4

Displays images with correct aspect ratio

4/4

Serves images with appropriate resolution

4/4

Page has the HTML doctype

4/4

Properly defines charset

4/4

No browser errors logged to the console

4/4

No issues in the `Issues` panel in Chrome Devtools

4/4

Accessibility

94/100

`[aria-*]` attributes match their roles

6/6

`[aria-hidden="true"]` is not present on the document `<body>`

6/6

`[role]`s have all required `[aria-*]` attributes

6/6

`[role]` values are valid

6/6

`[aria-*]` attributes have valid values

6/6

`[aria-*]` attributes are valid and not misspelled

6/6

Buttons have an accessible name

6/6

Image elements have `[alt]` attributes

6/6

`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

6/6

ARIA attributes are used as specified for the element's role

4/4

Elements use only permitted ARIA attributes

4/4

Background and foreground colors have a sufficient contrast ratio

4/4

Document has a `<title>` element

4/4

`<frame>` or `<iframe>` elements do not have a title

0/4

`<html>` element has a `[lang]` attribute

4/4

`<html>` element has a valid value for its `[lang]` attribute

4/4

Links have a discernible name

4/4

Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

4/4

No element has a `[tabindex]` value greater than 0

4/4

Touch targets have sufficient size and spacing.

4/4

Heading elements are not in a sequentially-descending order

0/2

Document has a main landmark.

2/2

Deprecated ARIA roles were not used

1/1

Instant Audit

See your site the way search engines feel it

Launch a free crawl in under 30 seconds and get a ranked hit-list of fixes that lift speed, visibility, and trust.

Start Free Analysis