Ui.adsabs.harvard.edu - SEO Checker

Overview of the SEO Check
Meta information
79% 
Page quality
52% 
Page structure
79% 
Link structure
0% 
Server
41% 
External factors
100% 
SEO Score
Response time
0.47 s
File size
5.40 kB
Words
19
Media files
0
Number of links
1 internal / 0 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
NASA/ADS
The page title is too short. (103 pixels of 580 max pixel length) Optimize title
There are no duplicate words in the title
Meta description
(Critically important)
A powerful, streamlined new Astrophysics Data System
The length of the meta description is perfect. (341 pixels out of 1000 max pixel length)
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
No canonical link is specified.
Language
(Somewhat important)
Language defined in HTML: en
Server location: United States of America
The following language is defined by HTML: en
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)
This page is hosted on a subdomain. Use a top level domain for better SEO results.
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)
The favicon is linked correctly.

Meta tags

NameValue
viewportwidth=device-width,user-scalable=no
google-site-verificationXxQuw38lagr8-TgtCyhAMP_6ELS9dy35fgrqo9dxw3o
descriptionA powerful, streamlined new Astrophysics Data System
apple-mobile-web-app-titleNASA ADS
application-nameNASA ADS
msapplication-TileColor#ffc40d
theme-color#ffffff
langen
X-UA-CompatibleIE=edge,chrome=1
charsetutf-8

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Page quality

Content
(Critically important)
There are only 19 words on this page. Use at least 250 words to provide useful information.
Some words from the page title are not used within the pages content
Words from the H1 heading are not used in the page content.
No paragraphs were detected.
21.1% of the text are stop words.
No placeholders texts or images were found.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
A viewport "width=device-width,user-scalable=no" is provided.
At least one Apple touch icon is specified.
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)
Alt text (alternative text) is correctly used on all found images.
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

No media files were found.

Page structure

H1 heading
(Critically important)
astrophysics data system
The H1 heading is perfect.
Headings
(Important)
The structure of headings is missing one or more levels. Do not skip heading levels.

Heading structure

Heading levelContent
H1 astrophysics data system
H3 Loading ADS | Click here to switch to Basic HTML (for slow connections/low resources)
Baselink: /
This page seems to be an entry page, because only very few links were found.
Every linktext is unique.
None of the anchor texts is too long.
All internal links are not using dynamic parameters.
There are no external links on this page.
LinkAttributesAnchor text
/coreSubdomain Click here to switch to Basic HTML

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://ui.adsabs.harvard.edu/"
HTTP header
(Important)
The HTML page should be transferred using GZip compression.
No X-Powered HTTP header is sent.
Performance
(Somewhat important)
The page response time of 0.47 seconds is longer than the recommended limit of 0.4 seconds. A high response time unnecessarily slows down search engine crawling and results in bad user experience as well.
The file size of the HTML document is fine (5 kB).

HTTP Response Header

NameValue
dateWed, 10 Apr 2024 20:12:11 GMT
content-typetext/html
content-length5573
last-modifiedThu, 22 Feb 2024 20:45:22 GMT
cache-controlmax-age=0, no-cache, no-store, must-revalidate
pragmano-cache
x-frame-optionsSAMEORIGIN
accept-rangesbytes
statuscode200
http_versionHTTP/2

External factors

Blacklists
(Nice to have)
This website is not classified "for adult only".
This page is referenced by wikipedia.
This website has excellent links from other websites.
This page has backlinks from 16,677 referring domains.
This page has 35,271,808 backlinks.
This page has backlinks from 8,971 different ip addresses.
Facebook popularity
(Somewhat important)
The page has 0 shares and comments on Facebook.

Robots.txt

Sitemap: https://ui.adsabs.harvard.edu/sitemap/sitemap_index.xml

User-agent: *
Disallow: /v1/
Disallow: /resources
Disallow: /core
Disallow: /tugboat
Disallow: /link_gateway/
Disallow: /search/
Disallow: /execute-query/
Disallow: /status

Allow: /help/
Allow: /about/
Allow: /blog/

# there may be a more elegant way to do this, but I fear that if we just use a 
# single regexp such as /abs/*/* we may miss out on indexing links containing
# DOIs or arXiv ids, so we do it the pedantic way
Allow: /abs/
Disallow: /abs/*/citations
Disallow: /abs/*/references
Disallow: /abs/*/coreads
Disallow: /abs/*/similar
Disallow: /abs/*/toc
Disallow: /abs/*/graphics
Disallow: /abs/*/metrics
Disallow: /abs/*/exportcitation

Search preview

ui.adsabs.harvard.edu
NASA/ADS
A powerful, streamlined new Astrophysics Data System

Most important keywords

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

KeywordResultRecheck
ADS62%Check
astrophysics62%Check
data62%Check
system62%Check
astrophysics data system62%Check
loading38%Check
Click38%Check
switch38%Check
Basic38%Check
HTML38%Check

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