Catalogueoflife.org - SEO Checker

Sign up for free! PDF Export
Overview of the SEO Check
Meta information
72% 
Page quality
57% 
Page structure
75% 
Link structure
81% 
Server
91% 
External factors
100% 
SEO Score
Response time
0.19 s
File size
19.50 kB
Words
286
Media files
8
Number of links
43 internal / 11 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
COL | The Catalogue of Life
The length of the page title is perfect. (250 pixels out of 580 max pixel length)
There are no duplicate words in the title
Meta description
(Critically important)
The Catalogue of Life
The meta description is too short. (132 pixels out of 1000 max pixel length) Optimize description
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
https://www.catalogueoflife.org/
There is a valid canonical link specified.
Language
(Somewhat important)
Language detected in text: en
Server location: United States of America
The language is not specified in the HTML markup.
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 character encoding is not specified in the HTTP header.
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)
No favicon is linked in the HTML code.

Meta tags

NameValue
viewportwidth=device-width, initial-scale=1
DC.identifierurn:ISSN:2405-8858
generatorJekyll v4.2.2
descriptionThe Catalogue of Life
twitter:cardsummary
twitter:titleCOL
og:titleCOL
og:localeen_US
og:descriptionThe Catalogue of Life
og:urlhttps://www.catalogueoflife.org/
og:site_nameCOL
og:typewebsite
X-UA-CompatibleIE=edge
charsetutf-8

Automatically check catalogueoflife.org including all subpages at once!

Try for free
Guaranteed free of charge during trial period.

Page quality

Content
(Critically important)
There are only 286 words on this page. Good pages should have about 800 words of useful content.
35% of the text are stop words.
Keywords used in the page title are also used in the page content. That's good!
The page contains a listing, which indicates a good text layout.
4 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 17.25 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
No Apple touch icon is specified.
A viewport "width=device-width, initial-scale=1" is provided.
Bold and strong tags
(Somewhat important)
The usage of strong and bold tags is perfect. We recommend the use of up to 6 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
/images/logos/col_logo.svgNo alt attribute provided
/images/logos/bibtex_logo.pngNo alt attribute provided
/images/logos/Smithsonian.svgNo alt attribute provided
/images/logos/ITIS_logo.svgNo alt attribute provided
/images/logos/logo-gbif.svgNo alt attribute provided
/images/logos/INHS.pngNo alt attribute provided
/images/logos/col_square_logo.jpgNo alt attribute provided
/images/logos/GCBR-Logo-White.svgNo alt attribute provided

Page structure

H1 heading
(Critically important)
The H1 heading is empty
Headings
(Important)
The structure of headings is missing one or more levels. Do not skip heading levels.
Some headings do not have any content.

Heading structure

Heading levelContent
H1 Empty heading
H1 Empty heading
H3 Current Version
H3 Documentation
H3 Recent News
H4 Contact Us
H4 Resources
H4 Version
H4 Disclaimer
Some internal links have dynamic parameters. All internal URLs, which are not marked as nofollow, should not contain dynamic parameters.
Some anchor texts are used more than once.
1 links don't have an anchor text.
The number of internal links is ok.
None of the anchor texts is too long.
There are 11 external links on this page.

Found links on this page

LinkAttributesAnchor text
https://www.catalogueoflife.org/No Text
/data/searchSearch
/data/metadataMetadata
/data/sourcesSources
/data/downloadDownload
/data/changelogChangelog
/howto/accessAccess data
/howto/contributeContribute data
/howto/citeCite data
/howto/use_casesUse Cases
/howto/contactContact us
/tools/checklistbankChecklistBank
/tools/apiCOL API
/building/assemblyAssembly
/building/qualityData Quality
/building/releasesReleases
/building/identifierIdentifier
/building/classificationClassification
/building/glossaryGlossary
/about/catalogueoflifeWhat is COL
/about/governanceGovernance
/about/fundingFunding
/about/communityCommunity
/news/indexNews
/about/catalogueoflife.htmlLearn more
/index?taxonKey=NAnimalia species in COL
/index?taxonKey=PPlantae species in COL
/index?taxonKey=FFungi species in COL
/index?taxonKey=ZOther kingdoms species in COL
https://doi.org/10.48580/dgvtgExternal 10.48580/dgvtg
https://api.checklistbank.org/...External Subdomain No Text
/building/releasesdifferent releases
/2025/10/07/colxr-liveA more comprehensive Catalogue of Life now Live!
/2025/07/09/annual-releaseCatalogue of Life 2025
/2025/07/04/bhl-checklistbankBiodiversity Heritage Library's Call for Support & integration with COL
/2025/03/27/orcid-auto-updateCOL DOIs & ORCIDs
/2025/03/04/Meet-the-LibroscopeMeet the Libroscope
/2024/11/05/Monalisa-Cachuela-...The first data manager of the Catalogue of Life
/2024/06/27/annual-releaseAnnual Release 2024
/2024/01/16/GBIF_to_serve_as_A...GBIF to serve as administrative host for Species 2000 Secretariat
https://www.si.edu/New window External Subdomain No Text
https://www.itis.gov/New window External Subdomain No Text
https://www.gbif.org/New window External Subdomain No Text
https://inhs.illinois.edu/New window External Subdomain No Text
/index.htmlNo Text
/howto/contactContact
https://www.linkedin.com/compa...External Subdomain No Text
https://www.facebook.com/Catal...External Subdomain No Text
/building/glossaryText duplicate Glossary
/data/metadata2025-12-20 XR
https://doi.org/10.48580/dgvtgExternal Text duplicate 10.48580/dgvtg
https://www.checklistbank.org/...External Subdomain 313531
http://creativecommons.org/lic...External Creative Commons Attribution 4.0 International License
/about/catalogueoflifeCatalogue of Life

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://www.catalogueoflife.org/"
HTTP header
(Important)
The web server version is sent within the HTTP header.
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 excellent with 0.19 seconds.
The file size of the HTML document is fine (20 kB).

HTTP Response Header

NameValue
accept-rangesbytes
age368
content-encodinggzip
content-typetext/html
dateTue, 20 Jan 2026 20:33:28 GMT
serverApache/2.4.58 (Ubuntu)
varyCookie, Accept, Accept-Encoding, Accept-Language, User-Agent
viaHTTP/2.0 git.gammaspectra.live/git/[email protected]+dirty
x-backendwww
x-cachehit_cached
x-varnish465057340 475832725
content-length4811
statuscode200
http_versionHTTP/2

External factors

This page is referenced by wikipedia.
This website has excellent links from other websites.
This page has backlinks from 797 referring domains.
This page has 59,601 backlinks.
This page has backlinks from 458 different ip addresses.

Links from Wikipedia

You can find more links using Wikipedia search

Robots.txt

User-agent: *
crawl-delay: 0.1


Disallow: /annual-checklist

Sitemap: https://www.catalogueoflife.org/sitemap.txt
Sitemap: https://www.catalogueoflife.org/sitemap-datasets.txt

Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-1.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-2.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-3.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-4.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-5.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-6.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-7.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-8.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-9.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-10.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-11.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-12.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-13.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-14.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-15.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-16.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-17.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-18.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-19.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-20.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-21.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-22.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-23.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-24.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-25.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-26.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-27.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-28.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-29.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-30.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-31.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-32.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-33.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-34.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-35.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-36.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-37.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-38.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-39.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-40.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-41.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-42.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-43.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-44.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-45.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-46.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-47.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-48.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-49.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-50.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-51.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-52.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-53.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-54.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-55.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-56.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-57.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-58.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-59.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-60.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-61.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-62.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-63.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-64.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-65.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-66.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-67.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-68.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-69.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-70.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-71.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-72.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-73.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-74.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-75.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-76.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-77.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-78.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-79.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-80.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-81.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-82.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-83.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-84.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-85.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-86.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-87.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-88.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-89.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-90.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-91.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-92.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-93.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-94.txt.gz
Sitemap: https://www.catalogueoflife.org/sitemaps/sitemap-95.txt.gz

Similar sites

Search preview

www.catalogueoflife.org
COL | The Catalogue of Life
The Catalogue of Life

Most important keywords

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

KeywordResultRecheck
Catalogue76%Check
Life76%Check
Version47%Check
Contact43%Check
News43%Check
Current43%Check
Documentation43%Check
Recent43%Check
Resources43%Check
Disclaimer43%Check
Show more keywords and terms

Automatically check catalogueoflife.org including all subpages at once!

Try for free
Guaranteed free of charge during trial period.

Cookie Policy

We use cookies to make our site work and also for analytics and advertising purposes. You can enable or disable optional cookies as desired. See the following links for more information.

Contact | Privacy

We need these so the site can function properly

So we can better understand how visitors use our website

So we can serve you tailored ads and promotions