Checkerframework.org - SEO Checker

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Overview of the SEO Check
Meta information
75% 
Page quality
80% 
Page structure
100% 
Link structure
95% 
Server
25% 
External factors
100% 
SEO Score
Response time
0.82 s
File size
9.20 kB
Words
589
Media files
1
Number of links
28 internal / 14 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
The Checker Framework
The length of the page title is perfect. (224 pixels out of 580 max pixel length)
There are no duplicate words in the title
Meta description
(Critically important)
The meta description is missing.
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
No canonical link is 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 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
Content-Typetext/html; charset=UTF-8

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Page quality

Content
(Critically important)
There are 2 text duplicates on this page:
  • Duplicate: Installation instructions or, try it without installation at the Check...
This page contains 589 words. That's ok.
33.4% of the text are stop words.
Keywords used in the page title are also used in the page content. That's good!
Words from the H1 heading are used in the page content.
The page contains a listing, which indicates a good text layout.
16 paragraphs were found on this page.
The text content is perfect.
No placeholders texts or images were found.
The average number of words per sentence of 15.38 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
No viewpoint tag is provided.
No Apple touch icon is specified.
This page does not require any JavaScript files.
Bold and strong tags
(Somewhat important)
The following tag is repeated too often: installation instructions and tutorial
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

URLAlt attributeTitle
https://checkerframework.org/CFLogo.pngChecker Framework logo

Page structure

H1 heading
(Critically important)
The Checker Framework
The H1 heading is perfect.
Headings
(Important)
The heading structure is perfect.

Heading structure

Heading levelContent
H1 The Checker Framework
H2 Support and community
H3 Documentation
H3 Bug reports
H3 Mailing lists
Some anchor texts are used more than once.
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 14 external links on this page.

Found links on this page

LinkAttributesAnchor text
/manual/Installation instructions and tutorial
/checker-framework-3.48.2.zipchecker-framework-3.48.2.zip
/manual/installation instructions and tutorial
/manual/Checker Framework Manual (HTML)
/manual/checker-framework-manu...Checker Framework Manual (PDF)
/manual/Installation instructions
http://eisop.uwaterloo.ca/live/External Subdomain Checker Framework Live Demo
/tutorial/Tutorial
https://github.com/glts/safer-...External Nullness Checker tutorial
/manual/FAQ (Frequently Asked Questions with answers)
https://checkerframework.org/api/Javadoc
/CHANGELOG.mdChangelog
https://github.com/typetools/c...External URL anchor text
https://github.com/typetools/checker-framework/
/manual/instructions on building from source
https://htmlpreview.github.io/...External Subdomain Developer manual
/manual/a list of inference tools
/annotation-file-utilities/Annotation File Utilities
/annotation-file-utilities/ann...annotation-tools-3.48.2.zip
https://github.com/typetools/a...External source code repository
/annotation-file-utilities/Documentation
/manual/checker-framework-data...Dataflow Framework
/releases/Archive of previous releases
/manual/Checker Framework manual
https://checkerframework.org/Anchor Text duplicate Documentation
https://checkerframework.org/Anchor mailing lists
/manual/checker-framework-manu...PDF
/manual/HTML
/manual/Text duplicate Installation instructions
http://eisop.uwaterloo.ca/live/External Subdomain Text duplicate Checker Framework Live Demo
/tutorial/Text duplicate Tutorial
https://github.com/glts/safer-...External Text duplicate Nullness Checker tutorial
/manual/Text duplicate FAQ (Frequently Asked Questions with answers)
https://checkerframework.org/api/Text duplicate Javadoc
/CHANGELOG.mdText duplicate Changelog
/manual/instructions
https://github.com/typetools/c...External Checker Framework issue tracker
https://groups.google.com/foru...External Subdomain checker-framework-discuss
https://groups.google.com/foru...External Subdomain view archives
https://types.cs.washington.ed...External Subdomain view old archives
https://groups.google.com/foru...External Subdomain checker-framework-dev
https://groups.google.com/foru...External Subdomain Text duplicate view archives
https://types.cs.washington.ed...External Subdomain Text duplicate view old archives

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://checkerframework.org/"
HTTP header
(Important)
The HTML page should be transferred using GZip compression.
The web server version is sent within the HTTP header.
No X-Powered HTTP header is sent.
Performance
(Somewhat important)
The page response time of 0.82 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.
This page does not require any CSS files.
This page does not require any JavaScript files.
The file size of the HTML document is fine (9 kB).

HTTP Response Header

NameValue
dateSun, 10 Nov 2024 05:56:57 GMT
serverApache/2.4.57 (Rocky Linux) OpenSSL/3.0.7 mod_wsgi/4.7.1 Python/3.9
last-modifiedFri, 01 Nov 2024 20:14:13 GMT
etag"24f1-625df94297736"
accept-rangesbytes
content-length9457
strict-transport-securitymax-age=15768000;includeSubdomains
content-typetext/html; charset=UTF-8
statuscode200
http_versionHTTP/1.1

External factors

This website has excellent links from other websites.
This page has backlinks from 516 referring domains.
This page has 74,893 backlinks.
This page has backlinks from 373 different ip addresses.

Links from Wikipedia

No links from Wikipedia were found.

Robots.txt

No valid Robots.txt file was found.

Similar sites

Search preview

checkerframework.org
The Checker Framework

Most important keywords

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

KeywordResultRecheck
Framework80%Check
Checker Framework77%Check
Checker75%Check
Checker Framework Manual63%Check
Dataflow Framework59%Check
Checker Framework Manual contains56%Check
Nullness Checker55%Check
instructions39%Check
Installation39%Check
tutorial39%Check
Show more keywords and terms

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