Discrete.openmathbooks.org - SEO Checker

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Overview of the SEO Check
Meta information
66% 
Page quality
80% 
Page structure
100% 
Link structure
96% 
Server
83% 
External factors
100% 
SEO Score
Response time
0.75 s
File size
10.30 kB
Words
986
Media files
3
Number of links
11 internal / 14 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
Discrete Mathematics - An Open Introduction
The length of the page title is perfect. (403 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)
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.
The character encoding is not specified in the HTTP header.
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

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Page quality

Content
(Critically important)
This page contains 986 words. That's ok.
39.4% 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.
18 paragraphs were found on this page.
The text content is perfect.
No placeholders texts or images were found.
There are no duplicates on the site.
The average number of words per sentence of 17.94 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 20 tags for this page.
Image SEO
(Somewhat important)
2 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
/assets/images/cover.pngNo alt attribute provided
/assets/images/oscarlevin.jpgNo alt attribute provided
...reativecommons.org/l/by-sa/4.0/88x31.pngCreative Commons License

Page structure

H1 heading
(Critically important)
Discrete Mathematics
The H1 heading is perfect.
Headings
(Important)
The heading structure is perfect.

Heading structure

Heading levelContent
H1 Discrete Mathematics
H2 An Open Introduction, 3rd edition
H3 Now Available: 4th edition!
H3 Get the book
H3 About the book
H3 License
H4 Runestone Academy
H4 PreTeXt (and LaTeX) source
H4 Instructor and student resources
H4 About the author
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.
All internal links are not using dynamic parameters.
There are 14 external links on this page.

Found links on this page

LinkAttributesAnchor text
/dmoi3/Read online
/pdfs/dmoi3-tablet.pdfDownload PDF
https://amzn.to/2BTlcR7New window External Buy paperback
/dmoi4.htmlNo Text
https://landing.runestone.acad...New window External Subdomain Runestone Academy
/adoptions.htmladoptions list
https://aimath.org/textbooks/a...New window External American Institute of Mathematics' Open Textbook Initiative
https://open.umn.edu/opentextb...New window External Subdomain Open Textbook Library
/dmoi2.phpSubdomain Previous editions
/errata3.pdferrata list
https://landing.runestone.acad...External Subdomain Text duplicate Runestone Academy
https://edfinity.co/levindmNew window External Edfinity
/cdn-cgi/l/email-protectioncontact the author
https://github.com/oscarlevin/...External GitHub issue
/dmoi3/interactive online ebook
/pdfs/dmoi-tablet.pdffree pdf version
https://amzn.to/2BTlcR7New window External Amazon
https://github.com/oscarlevin/...New window External GitHub
https://www.youtube.com/playli...New window External Subdomain Mathematical Visual Proofs
https://www.youtube.com/playli...New window External Subdomain Dr. Trevor Bazett's Course
/cdn-cgi/l/email-protectionText duplicate contact the author
http://math.oscarlevin.com/New window External Subdomain Oscar Levin
http://creativecommons.org/lic...New window External IMG-ALT Creative Commons License
http://creativecommons.org/lic...New window External Creative Commons Attribution-ShareAlike 4.0 International License
/cdn-cgi/l/email-protectionreach out

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://discrete.openmathbooks.org/dmoi3.html"
HTTP header
(Important)
No X-Powered HTTP header is sent.
This page uses GZip for compressed data transmission.
Performance
(Somewhat important)
The page response time of 0.75 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 (10 kB).

HTTP Response Header

NameValue
dateMon, 26 Aug 2024 03:04:37 GMT
content-typetext/html
last-modifiedThu, 15 Aug 2024 17:53:28 GMT
varyAccept-Encoding
x-turbo-charged-byLiteSpeed
cf-cache-statusDYNAMIC
report-to{"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v4?s=6P9Wnfb7wc9IYXgQgv1XhXOVn3y06WJXpJIc5PAbKiEMUbumkwe9gnVzvqBWzkxwgFBgHpxdK97M4cAXMDtTy0IpcA8g%2FyOBnQDENtpLZNb5umDZv2GYc20cEoHJp0z%2BJOpUgaDVtalln73ydA%3D%3D"}],"group":"cf-nel","max_age":604800}
nel{"success_fraction":0,"report_to":"cf-nel","max_age":604800}
servercloudflare
cf-ray8b90986f4e325d79-FRA
content-encodinggzip
alt-svch3=":443"; ma=86400
statuscode200
http_versionHTTP/2

External factors

Blacklists
(Nice to have)
This website is not classified "for adult only".
This website has excellent links from other websites.
This page has backlinks from 92 referring domains.
This page has 165 backlinks.
This page has backlinks from 88 different ip addresses.
Facebook popularity
(Somewhat important)
The page has 0 shares and comments on Facebook.

Links from Wikipedia

No links from Wikipedia were found.

Robots.txt

No valid Robots.txt file was found.

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discrete.openmathbooks.org › dmoi3.html
Discrete Mathematics - An Open Introduction

Most important keywords

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

KeywordResultRecheck
Discrete68%Check
math68%Check
Discrete Mathematics65%Check
Mathematics62%Check
Open56%Check
Open Introduction53%Check
Open Source51%Check
Introduction49%Check
book48%Check
Open Textbook45%Check
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