Website review, no card needed
keller-lufttechnik.de website review
Visit site (opens in a new tab)Reviewed 21 October 202611 issues · 70 checks
This review found 11 issues worth fixing on keller-lufttechnik.de, 4 of them high impact, across 70 checks. The most urgent: aRIA dialog and alertdialog nodes should have an accessible name (1 element). Your full playbook turns these into prioritised fixes alongside reviews, competitors and channels.
- Homepage
- Phone render
- Links and pages
- Google PageSpeed
Google PageSpeed Insights (opens in a new tab), mobile
Site score
94AClosest competitors among reviewed websites
Compare side by sideShow as table
| Date | Real-visitor load time (LCP) |
|---|---|
| May 2, 2026 | 696 ms |
| May 9, 2026 | 681 ms |
| May 16, 2026 | 686 ms |
| May 23, 2026 | 750 ms |
| May 30, 2026 | 734 ms |
| Jun 6, 2026 | 866 ms |
| Jun 13, 2026 | 784 ms |
| Jun 20, 2026 | 805 ms |
| Jun 27, 2026 | 748 ms |
| Jul 4, 2026 | 735 ms |
| Jul 11, 2026 | 733 ms |
| Jul 18, 2026 | 745 ms |
| Jul 25, 2026 | 783 ms |
| Aug 1, 2026 | 859 ms |
| Aug 8, 2026 | 862 ms |
| Aug 15, 2026 | 749 ms |
| Aug 22, 2026 | 830 ms |
| Aug 29, 2026 | 888 ms |
| Sep 5, 2026 | 952 ms |
| Sep 12, 2026 | 1.0 s |
| Sep 19, 2026 | 998 ms |
| Sep 26, 2026 | 907 ms |
| Oct 3, 2026 | 892 ms |
| Oct 10, 2026 | 1.0 s |
| Oct 17, 2026 | 990 ms |
Show as table
| Date | Real-visitor tap response (INP) |
|---|---|
| May 2, 2026 | 72 ms |
| May 9, 2026 | 72 ms |
| May 16, 2026 | 72 ms |
| May 23, 2026 | 77 ms |
| May 30, 2026 | 78 ms |
| Jun 6, 2026 | 82 ms |
| Jun 13, 2026 | 81 ms |
| Jun 20, 2026 | 77 ms |
| Jun 27, 2026 | 77 ms |
| Jul 4, 2026 | 77 ms |
| Jul 11, 2026 | 76 ms |
| Jul 18, 2026 | 76 ms |
| Jul 25, 2026 | 77 ms |
| Aug 1, 2026 | 75 ms |
| Aug 8, 2026 | 74 ms |
| Aug 15, 2026 | 73 ms |
| Aug 22, 2026 | 73 ms |
| Aug 29, 2026 | 77 ms |
| Sep 5, 2026 | 79 ms |
| Sep 12, 2026 | 83 ms |
| Sep 19, 2026 | 84 ms |
| Sep 26, 2026 | 86 ms |
| Oct 3, 2026 | 86 ms |
| Oct 10, 2026 | 80 ms |
| Oct 17, 2026 | 80 ms |
Chrome UX Report (opens in a new tab): real Chrome visitors over rolling 28-day periods.
One score from every part of this review. How it works
How it loaded on a phone
0.4 s
0.8 s
1.1 s
1.5 s
1.9 s
2.3 s
2.6 s
3.0 s
Speed
Render-blocking requests
600 ms2 files block the first paint until they finish downloading. Deferring or inlining them could save about 600 ms.
Reduce unused CSS
150 ms · 38 KiBAbout 38 KiB of CSS is downloaded but never applied on this page. Google estimates it would make the page about 150 ms faster on a phone.
Improve image delivery
150 ms · 27 KiB1 image could be 27 KiB smaller with modern formats (WebP or AVIF) and sizes that fit a phone screen. Google estimates it would make the page about 150 ms faster on a phone.
Chained critical requests
Critical files load one after another instead of in parallel (3 chains). Preconnecting to key origins and preloading the hero image shortens the chain.
Forced reflow
Scripts make the browser recalculate the layout repeatedly while the page loads, which wastes processor time on phones.
3 checks passed
Mobile performance score: 100
100/100Your mobile performance score is 100 (desktop: 100). That is in Google's “good” band (90 and up).
Main-thread work: 0.3 s
A phone's processor spends 0.3 s on main-thread work while loading, 28 ms of it running JavaScript. That is comfortably low.
Server response: 2 ms
2 msYour server sent the HTML in 2 ms, well inside Google's 600 ms guideline.
Core Web Vitals
Largest content (LCP) got 45% slower for real visitors
+45%Over the last 25 four-week periods to 2026-10-17, real Chrome visitors' largest content (lcp) went from 0.7 s to 1.0 s at the 75th percentile (Chrome UX Report (opens in a new tab) history).
Tap response (INP) got 11% slower for real visitors
+11%Over the last 25 four-week periods to 2026-10-17, real Chrome visitors' tap response (inp) went from 72 ms to 80 ms at the 75th percentile (Chrome UX Report (opens in a new tab) history).
12 checks passed
Passes Core Web Vitals for real visitors
Real Chrome users on phones pass Google's Core Web Vitals on this page (28-day field data from the Chrome UX Report (opens in a new tab)).
Real-user LCP: 1.0 s
1.0 sReal visitors wait 1.0 s for the largest content to appear (75th percentile). Good is under 2.5 s.
Real-user INP: 77 ms
77 msReal visitors wait 77 ms for the page to respond to a tap (75th percentile). Good is under 200 ms.
Real-user CLS: 0.00
0.00For real visitors the layout shifts by 0.00 (75th percentile). Good is under 0.1.
Real-user FCP: 0.9 s
0.9 sReal visitors see the first content after 0.9 s (75th percentile). Good is under 1.8 s.
Real-user TTFB: 553 ms
553 msReal visitors wait 553 ms for your server to start answering (75th percentile). Good is under 800 ms.
Speed Index: 2.5 s
2.5 sVisually, the page fills in at 2.5 s (Speed Index), inside the 3.4 s “good” threshold.
Largest Contentful Paint: 1.7 s
1.7 sYour largest element renders in 1.7 s on a phone, inside Google's 2.5 s “good” threshold. The largest element is the image “Prozess Festo”.
Cumulative Layout Shift: 0
0The layout barely moves while loading (CLS 0, good is under 0.1).
First Contentful Paint: 1.1 s
1.1 sThe first text or image appears after 1.1 s, inside the 1.8 s “good” threshold.
Total Blocking Time: 0 ms
0 msScripts block the page for only 0 ms while loading. Good is under 200 ms.
Time to Interactive: 1.7 s
1.7 sThe page is fully interactive after 1.7 s.
Images and page weight
About 0.09 g of CO₂ per visit
0.09 gBy the Sustainable Web Design model, a visit to your homepage emits about 0.09 g of CO₂e: 10.5 kg a year at 10,000 visits a month. It scales with page weight, so every byte cut lowers it.
4 checks passed
Page weight: 317 KiB in 23 requests
317 KiBYour homepage downloads 317 KiB in 23 requests on a phone: images 237 KiB (12), stylesheets 47 KiB (2) and scripts 20 KiB (8). That is a lean page.
Images use modern formats
Every sizeable image is WebP, AVIF or SVG.
Images load when needed
Images below the first screen wait until the visitor scrolls to them.
Images are sized for phones
No image is downloaded at more than three times the size it is drawn on a phone.
Accessibility
ARIA dialog and alertdialog nodes should have an accessible name (1 element)
ARIA dialog and alertdialog nodes should have an accessible name: 1 element on the page fails this check, rated serious by axe-core.
1 text element with low contrast
1 text element doesn't have enough contrast against the background to read easily, especially outdoors on a phone.
12 links without text
12 visible links have no text or label, so screen readers cannot say where they go.
1 form field without a label
1 form field has no label, so screen readers announce an empty box and autofill guesses.
2 checks passed
Every image has alt text
All 13 images in the HTML carry an alt attribute.
45 automated accessibility rules passed
axe-core 4.13.0, the open-source engine behind most accessibility testing tools, ran 48 WCAG 2.2 A/AA and best-practice rules on the phone render: 45 passed and 3 failed. 4 mores need a person to judge. Automated rules catch about a third of accessibility problems; the rest need manual testing.
SEO
41 internal links, 8 external
The homepage links to 41 pages on keller-lufttechnik.de and 8 external pages.
8 checks passed
Meta description: 145 characters
Your meta description is 145 characters: “Maßstab für reine Luft. Individuelle Absauglösungen für die Industrie. Erfahren Sie mehr über unsere Produkte und Leist…”.
One H1 headline
Your main headline reads: “Absaugtechnik für reine Luft in der Industrie”.
Title: 52 characters
Your title is a healthy 52 characters: “Absaugtechnik für die Industrie | Keller Lufttechnik”.
Canonical URL set
The canonical URL is https://www.keller-lufttechnik.de/.
Structured data in place
Structured data found: Organization and WebPage.
Open Graph tags complete
Open Graph tags are complete, so shared links show a title, description and image.
robots.txt in place
robots.txt is in place and points crawlers to your sitemap.
XML sitemap found
Your XML sitemap is reachable at https://www.keller-lufttechnik.de/sitemap.xml.
AI search readiness
No llms.txt
There is no https://www.keller-lufttechnik.de/llms.txt, a short Markdown guide to your key pages for AI tools (llmstxt.org). It is optional and few AI tools read it yet, so treat it as a cheap extra.
3 checks passed
AI answer engines may read the site
Your robots.txt lets the crawlers behind ChatGPT search, Claude and Perplexity read the site and cite it in answers.
Organization data: 4 of 6 facts
Your Organization JSON-LD gives name, url, sameAs (social profiles) and contact details; logo and description would complete it.
Text is in the HTML
Your server sends the page's text in the HTML (1,175 words), so crawlers that don't run JavaScript still read it.
Other pages
15 internal pages checked
We fetched 15 pages linked from your homepage (of 26 found) and read each the way a search engine does.
7 checks passed
Linked pages load
All 15 pages we checked loaded without an error.
Canonical URLs point to themselves
No page we checked hands its ranking to a different URL.
Every page has a meta description
All 15 pages that loaded have a meta description.
Titles are unique
Every page we checked has its own title.
Every page has an H1
Each page we checked has a main headline.
No linked page is hidden from search
None of the pages we checked carries a noindex tag.
Every page has a title
All 15 pages that loaded have a <title>.
Best practices
3 checks passed
No console errors
No JavaScript errors were logged while the page loaded on a phone.
Tap targets are thumb-sized
14 of 17 tappable elements near the top are at least 24 px.
Mobile viewport set
The page declares a mobile viewport.
Content and conversion
No call to action on the first screen
On a phone, there is no call to action on the first screen: visitors have to scroll to find out what to do next.
No calls to action
We found no call-to-action buttons or links (such as “Book a demo” or “Get a quote”) anywhere on the homepage.
Local business without LocalBusiness data
Your homepage shows a street address but no LocalBusiness JSON-LD, so Google and AI assistants have to guess your address, hours and phone from the page text.
Thin social proof
Social proof on the homepage: 1 trust badge. Pairing it with named testimonials or customer logos makes it far more convincing.
No analytics detected
No analytics or tag manager detected in the HTML, so you can't measure whether any of these fixes work.
No opening hours
The homepage shows no opening hours. If customers visit or call, show when.
No risk reducer
No guarantee or risk reducer (money-back, free trial, no credit card) is mentioned, which is often what tips a hesitant visitor.
About 562 words of copy
The homepage carries about 562 words of visible text.
3 checks passed
2 short forms
2 short forms (3 fields at most) are right on the homepage.
Direct contact links
Visitors can reach you directly: 2 phone links and 0 email links.
Phone number on the homepage
Your phone number is on the homepage as a tap-to-call link.
Privacy and tracking
No consent tool detected
No known cookie consent tool loads with the page. Some sites build their own banner, and some only show one to visitors from the EU.
1 checks passed
No known trackers before consent
No known advertising or analytics trackers load before a visitor clicks anything (measured from a US location before any click).
Security, domain, email and software versions
The security, domain and email checks, software and plugin versions, and any app with a known security problem are visible only to people at keller-lufttechnik.de, because details like these could help someone attack a site. Every review keeps them private, whatever they found.
Upkeep, stack and company
Stack
- CMS
- TYPO3 CMS
Upkeep, stack, hiring and company data from programmable.info
Go beyond the website
What your $25 Growth Playbook adds
This review found 11 issues on keller-lufttechnik.de, including 2 speed issues and 5 conversion gaps. That is the website alone. The full Growth Playbook pairs these findings with what your customers say in public reviews and communities and what your closest competitors do better, then turns everything into at least 20 prioritised ideas, each with the evidence behind it, a step-by-step playbook, a metric and an owner.
- 28 research agents read your site, reviews, competitors, communities and public filings
- Customer review mining (G2, Capterra, Trustpilot and more) and voice-of-pain analysis in your buyers’ own words
- Competitor intelligence with battlecards for your closest rivals
- Ideal customer profile, buyer segments and buying-stage funnel
- Ranked channels, outreach sequences and content angles
- Live Reddit threads where buyers ask for what you sell, with draft replies
- Earned media and PR openings
- At least 20 ideas with evidence, a step-by-step playbook, metric, owner, effort and impact, grouped into this week, this quarter, big bets and wildcards, plus a 30/60/90-day roadmap
- PDF, Markdown, CSV, Notion and Linear exports, and a shareable page your team can track progress on
- Refresh the playbook later to see what changed
14-day money-back guarantee: not happy for any reason, email us within 14 days and we refund in full.