Cisuvc.com - SEO Checker

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Overview of the SEO Check
Meta information
92% 
Page quality
53% 
Page structure
33% 
Link structure
66% 
Server
86% 
External factors
63% 
SEO Score
Response time
1.08 s
File size
177.60 kB
Words
466
Media files
17
Number of links
69 internal / 8 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
Home - Crystal IS
The page title is too short. (159 pixels of 580 max pixel length) Optimize title
There are no duplicate words in the title
Meta description
(Critically important)
Crystal IS is the leader in aluminum nitride technology and manufactures UVC LEDs for sensing and disinfection.
The length of the meta description is perfect. (694 pixels out of 1000 max pixel length)
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
https://www.cisuvc.com/
There is a valid canonical link specified.
Language
(Somewhat important)
Language detected in text: en
Language defined in HTML: en-us
Server location: United States of America
The following language is defined by HTML: en-us
Alternate/Hreflang Links
(Somewhat important)
There are no alternate links specified on this page.
Other meta tags
(Somewhat important)
There is no rel next meta tag on this page.
There is no rel prev meta tag on this page.
Domain
(Somewhat important)
The domain is no subdomain.
The domain length is good.
The domain does not contain non-latin characters.
Page URL
(Somewhat important)
No parameters were found in the URL.
No session ID was found in the URL.
The URL does not have too many subdirectories.
Charset encoding
(Somewhat important)
The charset encoding (UTF-8) is set correctly.
Doctype
(Nice to have)
The doctype HTML 5 is set correctly.
The doctype is placed at first in the HTML code.
Favicon
(Nice to have)
The favicon is linked correctly.

Meta tags

NameValue
viewportwidth=device-width, initial-scale=1
robotsindex, follow, max-image-preview:large, max-snippet:-1, max-video-preview:-1
descriptionCrystal IS is the leader in aluminum nitride technology and manufactures UVC LEDs for sensing and disinfection.
generatorPowered by Slider Revolution 6.6.20 - responsive, Mobile-Friendly Slider Plugin for WordPress with comfortable drag and drop interface.
msapplication-TileImagehttps://www.cisuvc.com/wp-content/uploads/2023/12/cropped-CIS-fav-icon-01-01-270x270.png
article:publisherhttps://www.facebook.com/cisuvc
article:modified_time2026-01-06T16:58:29+00:00
langen-us
twitter:cardsummary_large_image
og:localeen_US
og:typewebsite
og:titleHome - Crystal IS
og:descriptionCrystal IS is the leader in aluminum nitride technology and manufactures UVC LEDs for sensing and disinfection.
og:urlhttps://www.cisuvc.com/
og:site_nameCrystal IS
charsetUTF-8

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Page quality

Content
(Critically important)
Words from the H1 heading are not used in the page content.
There are only 466 words on this page. Good pages should have about 800 words of useful content.
24.2% of the text are stop words.
The page contains a listing, which indicates a good text layout.
6 paragraphs were found on this page.
No placeholders texts or images were found.
There are no duplicates on the site.
The average number of words per sentence of 17.56 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
A viewport "width=device-width, initial-scale=1" is provided.
At least one Apple touch icon is specified.
Bold and strong tags
(Somewhat important)
The amount of tags is very high (12). We recommend using a maximum of 9 tags for this page.
Image SEO
(Somewhat important)
8 images have no alt attribute. The content of alt attributes is used by search engines.
Social Networks
(Nice to have)
There are only a few social sharing widgets on the page. Make your website popular in social networks with social sharing widgets.
Additional markup
(Nice to have)
No additional page markup was found.
HTTPS
(Somewhat important)
This website uses HTTPS to protect privacy and integrity of the exchanged data.
All included files are also transferred via HTTPS.

Media list

URLAlt attributeTitle
.../11/CIS-LOGO-HORIZON-RGB-WHITE-COLOR.pngNo alt attribute providedCIS-LOGO-HORIZON-RGB-WHITE-COLOR
.../11/CIS-LOGO-HORIZON-RGB-WHITE-COLOR.pngNo alt attribute providedCIS-LOGO-HORIZON-RGB-WHITE-COLOR
...revslider/public/assets/assets/dummy.pngiStock-1602595252-1_1-scaled.jpegiStock-1602595252-1_1.jpeg
...revslider/public/assets/assets/dummy.pngiStock-1602595252-1_1-scaled.jpegiStock-1602595252-1_1.jpeg
...revslider/public/assets/assets/dummy.pngiStock-1602595252-1_1-scaled.jpegiStock-1602595252-1_1.jpeg
/wp-content/uploads/2023/12/Group-582.pngNo alt attribute providedGroup 582
/wp-content/uploads/2023/12/Vector.pngNo alt attribute providedVector
/wp-content/uploads/2023/12/Vector.pngNo alt attribute providedVector
/wp-content/uploads/2023/12/Vector.pngNo alt attribute providedVector
...ds/2024/03/grayscale_figawa-Logo-pos.pngNo alt attribute providedgrayscale_figawa-Logo-pos
...s/2025/09/UVSAFE_logo_Dk-Gray-scaled.pngUVSAFE logoUVSAFE_logo_Dk Gray
.../Advanced-UV-for-Life-Logo-350x100-1.pngNo alt attribute providedAdvanced-UV-for-Life-Logo-350×100-1
/wp-content/uploads/2023/12/IUVA_logo-1.pngIUVA_logoIUVA_logo
...t/uploads/2023/12/we_member_scaled-1.pngwe_member_scaledwe_member_scaled
...2023/12/CIS-LOGO-HORIZON-RGB-COLOR-1.pngCIS-LOGO-HORIZON-RGB-COLOR (1)
Video URLWidthHeight
...nt/uploads/2023/12/air_vhs_vimeo_720.mp4
...uploads/2023/12/Crystal-IS-CTA-video.mp4

Page structure

H1 heading
(Critically important)
Delivering Effective, Reliable Products
Too many H1 headings
Headings
(Important)
Some headings occur twice on the page.
The structure of headings is missing one or more levels. Do not skip heading levels.

Heading structure

Heading levelContent
H1 Delivering Effective, Reliable Products
H1 We are committed to building a sustainable future by replacing traditional mercury lamp technology
H1 Helping Customers Leverage Our Experience
H1 Recent News About Crystal IS
H1 Committed to sustainability around the world
H3 UVC Disinfection LEDs
H3 UVC Disinfection LEDs Duplicate text
H3 UVC LED Systems
H3 UVC LED Systems Duplicate text
H3 UVC Sensor LEDs
H3 UVC Sensor LEDs Duplicate text
H3 Substrates
H3 Substrates Duplicate text
H3 Crystal IS and Asahi Kasei have achieved 99% usable area on 100 mm bulk aluminum nitride substrate
H3 Amway announces new eSpring™ product featuring UVC LEDs from Crystal IS
H3 Crystal IS and Asahi Kasei Announce First 4-inch Aluminum Nitride Substrate - Crystal IS has achieved 4-inch (100 mm) diameter bulk aluminum nitride substrate
H3 Proud Member Of
H3 Products
H3 Company
H3 Follow Us
H3 Contact Us
Some anchor texts are used more than once.
4 links don't have an anchor text.
The number of internal links is ok.
None of the anchor texts is too long.
All internal links are not using dynamic parameters.
There are 8 external links on this page.

Found links on this page

LinkAttributesAnchor text
/company/sustainability/Sustainability
/company/careers/Careers
https://www.cisuvc.com/news/News & Events
https://www.cisuvc.com/No Text
https://www.cisuvc.com/Anchor No Text
https://www.cisuvc.com/products/Products
/klaran-for-disinfection/Klaran for Disinfection
/products/optan-uvc-sensor-leds/Optan UVC Sensor LEDs
/products/substrates/Substrates
https://www.cisuvc.com/markets/Markets
/markets/consumer-water-disinf...Consumer Water Disinfection
/markets/commercial-water-trea...Commercial Water Treatment
/markets/industrial-water-syst...Industrial Water Systems
/markets/additional-markets/Additional Markets
https://www.cisuvc.com/company/About Crystal IS
/company/quality-documents/Quality Documents
https://www.cisuvc.com/news/Text duplicate News & Events
/company/sustainability/Text duplicate Sustainability
/company/careers/Text duplicate Careers
https://www.cisuvc.com/knowledge/Knowledge Base
/contact-us/Contact Us
/company/sustainability/Text duplicate Sustainability
/company/careers/Text duplicate Careers
https://www.cisuvc.com/news/Text duplicate News & Events
https://www.cisuvc.com/No Text
https://www.cisuvc.com/products/Text duplicate Products
/klaran-for-disinfection/Text duplicate Klaran for Disinfection
/products/optan-uvc-sensor-leds/Text duplicate Optan UVC Sensor LEDs
/products/substrates/Text duplicate Substrates
https://www.cisuvc.com/markets/Text duplicate Markets
/markets/consumer-water-disinf...Text duplicate Consumer Water Disinfection
/markets/commercial-water-trea...Text duplicate Commercial Water Treatment
/markets/industrial-water-syst...Text duplicate Industrial Water Systems
/markets/additional-markets/Text duplicate Additional Markets
https://www.cisuvc.com/company/Text duplicate About Crystal IS
/company/quality-documents/Text duplicate Quality Documents
https://www.cisuvc.com/news/Text duplicate News & Events
/company/sustainability/Text duplicate Sustainability
/company/careers/Text duplicate Careers
https://www.cisuvc.com/knowledge/Text duplicate Knowledge Base
/contact-us/Text duplicate Contact Us
https://www.cisuvc.com/company/Nofollow Get Started
https://www.cisuvc.com/company/Nofollow Text duplicate Get Started
https://www.cisuvc.com/company/Nofollow Text duplicate Get Started
/products/klaran/uvc-disinfect...No Text
/products/klaran/uvc-led-systems/No Text
/products/optan-uvc-sensor-leds/No Text
/products/substrates/No Text
https://www.cisuvc.com/marketsDiscover How
https://www.cisuvc.com/knowledgeLearn More
/crystal-is-improves-100mm-sub...Text duplicate Learn More
/amway-announces-new-espring-p...Text duplicate Learn More
/crystal-is-and-asahi-kasei-an...Text duplicate Learn More
/company/sustainability/Discover
http://uvsafe.org/New window External No Text
http://uvsafe.org/New window External IMG-ALT UVSAFE logo
https://wqa.org/New window External No Text
https://iuva.org/New window External IMG-ALT IUVA_logo
https://watercoolerseurope.eu/New window External IMG-ALT we_member_scaled
https://www.cisuvc.com/IMG-ALT CIS-LOGO-HORIZON-RGB-COLOR (1)
/products/klaran/Klaran
/products/optan-uvc-sensor-leds/Optan
/products/substrates/Text duplicate Substrates
https://www.cisuvc.com/marketsText duplicate Markets
/company/quality-documents/Text duplicate Quality Documents
https://www.cisuvc.com/news/Text duplicate News & Events
/company/sustainability/Text duplicate Sustainability
/company/careers/Text duplicate Careers
https://www.cisuvc.com/knowledgeText duplicate Knowledge Base
https://www.youtube.com/@cryst...New window External Subdomain A-TITLE YouTube
https://www.linkedin.com/compa...New window External Subdomain A-TITLE LinkedIn
https://www.google.com/maps/pl...New window External Subdomain 70 Cohoes Avenue Green Island, NY 12183
/terms-of-useTerms of Use.
/Terms-of-SaleTerms of Sale.
https://www.cisuvc.com/PatentsPatents.
https://www.cisuvc.com/PrivacyPrivacy.
/site-creditsSite Credits.

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://www.cisuvc.com/"
HTTP header
(Important)
No X-Powered HTTP header is sent.
The web server transmits the web page (HTML) in compressed form.
Performance
(Somewhat important)
The page response time is slow (1.08 seconds). The response time should be less than 0.4 seconds. Slow websites are bad for search engine bots and also result in bad user experience.
The file size of the HTML document is fine (178 kB).

HTTP Response Header

NameValue
servernginx
dateMon, 26 Jan 2026 13:09:57 GMT
content-typetext/html; charset=UTF-8
content-length31984
varyX-Forwarded-Proto,Accept-Encoding
last-modifiedMon, 26 Jan 2026 12:19:14 GMT
etag"7cf0-6494983ea73d9"
referrer-policy
content-encodinggzip
x-cache-nxaccelBYPASS
accept-rangesbytes
statuscode200
http_versionHTTP/2

External factors

This page has only a few links from other websites.
This page only has backlinks from 21 referring domains.
This page only has 50 backlinks.
This page only has few backlinks from 21 different ip addresses.

Links from Wikipedia

No links from Wikipedia were found.

Robots.txt

# START YOAST BLOCK
# ---------------------------
User-agent: *
Disallow:

Sitemap: https://www.cisuvc.com/sitemap_index.xml
# ---------------------------
# END YOAST BLOCK

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Search preview

www.cisuvc.com
Home - Crystal IS
Crystal IS is the leader in aluminum nitride technology and manufactures UVC LEDs for sensing and disinfection.

Most important keywords

Following keywords were found. You can check the keyword optimization of this page for each keyword.

KeywordResultRecheck
UVC68%Check
Crystal66%Check
UVC LED66%Check
UVC LEDs61%Check
Aluminum Nitride UVC58%Check
LEDs54%Check
Disinfection54%Check
Aluminum54%Check
Nitride54%Check
Aluminum Nitride54%Check
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