Sudokuonline.io - SEO Checker

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Overview of the SEO Check
Meta information
100% 
Page quality
91% 
Page structure
88% 
Link structure
78% 
Server
100% 
External factors
100% 
SEO Score
Response time
0.11 s
File size
211.50 kB
Words
1970
Media files
52
Number of links
55 internal / 12 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
Sudoku Online | Free Sudoku Puzzles to Play Online
The length of the page title is perfect. (472 pixels out of 580 max pixel length)
There are no duplicate words in the title
Meta description
(Critically important)
Play Sudoku Online: solve unlimited free sudoku puzzles from easy, medium, hard and evil difficulty levels. Play it and challenge yourself.
The length of the meta description is perfect. (845 pixels out of 1000 max pixel length)
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
https://www.sudokuonline.io/
There is a valid canonical link specified.
Language
(Somewhat important)
Language detected in text: en
Language defined in HTML: en
Server location: United States of America
The following language is defined by HTML: en
Alternate/Hreflang Links
(Somewhat important)
The specified alternate links have no errors.
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, maximum-scale=5
descriptionPlay Sudoku Online: solve unlimited free sudoku puzzles from easy, medium, hard and evil difficulty levels. Play it and challenge yourself.
apple-mobile-web-app-titleSudokuOnline.io
application-nameSudokuOnline.io
msapplication-TileColor#2b5797
msapplication-confighttps://cdn.sudokuonline.io/static/favicon/browserconfig.xml
theme-color#5279a5
al:web:urlhttps://www.sudokuonline.io/
langen
twitter:descriptionPlay Sudoku Online: solve unlimited free sudoku puzzles from easy, medium, hard and evil difficulty levels. Play it and challenge yourself.
twitter:urlhttps://www.sudokuonline.io/
twitter:cardsummary
twitter:titleSudoku Online | Free Sudoku Puzzles to Play Online
og:descriptionPlay Sudoku Online: solve unlimited free sudoku puzzles from easy, medium, hard and evil difficulty levels. Play it and challenge yourself.
og:urlhttps://www.sudokuonline.io/
og:site_nameSudoku Online | Free Sudoku Puzzles to Play Online
og:typewebsite
og:titleSudoku Online | Free Sudoku Puzzles to Play Online
Content-Typetext/html; charset=UTF-8

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Page quality

Content
(Critically important)
This page contains 1970 words. That's ok.
45.1% 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.
35 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 18.7 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, maximum-scale=5" 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 39 tags for this page.
Image SEO
(Somewhat important)
9 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
....io/static/images/logo/sudoku-navbar.svgSudoku Online
...nline.io/static/images/icons/BT_Play.pngplay button
...nline.io/static/images/icons/printer.svgprinter
...ine.io/static/images/logo/logo-order.svgAppstore
...static/images/icons/app_rating_stars.pngrating stars
...static/images/icons/app_rating_stars.pngrating stars
...static/images/icons/app_rating_stars.pngrating stars
...static/images/icons/app_rating_stars.pngrating stars
...static/images/icons/app_rating_stars.pngrating stars
...sudokuonline.io/static/images/app-qr.svgdownload qr code
...c/images/platforms/google-play-badge.pnggoogle play
...io/static/images/platforms/app_store.svgapple store
/media/post-images/2021/03/30/hint.svgNo alt attribute provided
/media/post-images/2021/03/30/hint.svgNo alt attribute provided
/media/post-images/2021/03/30/hint.svgNo alt attribute provided
/media/post-images/2021/03/30/hint.svgNo alt attribute provided
/media/post-images/2021/03/30/hint.svgNo alt attribute provided
/media/post-images/2021/03/30/hint.svgNo alt attribute provided
/media/post-images/2021/03/30/hint.svgNo alt attribute provided
/media/post-images/2021/03/30/hint.svgNo alt attribute provided
/media/post-images/2021/03/30/hint.svgNo alt attribute provided
...st-images/sudoku_killer_combinations.jpgpost image
/media/post-images/sudoku-killer-45.jpgpost image
...ine.io/static/images/logo/logo-order.svgAppstore
...static/images/icons/app_rating_stars.pngrating stars
...static/images/icons/app_rating_stars.pngrating stars
...static/images/icons/app_rating_stars.pngrating stars
...static/images/icons/app_rating_stars.pngrating stars
...static/images/icons/app_rating_stars.pngrating stars
...sudokuonline.io/static/images/app-qr.svgdownload qr code
...c/images/platforms/google-play-badge.pnggoogle play
...io/static/images/platforms/app_store.svgapple store
...er.mobi/media/tvos_radios/nmHKVyp8dC.pngRadio Image
...sudokuonline.io/static/icons/no_song.svgSong
...kuonline.io/static/icons/button_play.svgplay
...online.io/static/icons/button_volume.svgvolume
.../media/tvos_radios/300/swr3.82e9d0f5.pngRadio images
...er.mobi/media/tvos_radios/GSUD5FcSSx.jpgRadio images
...r.mobi/media/tvos_radios/45DD8BRSeK.jpegRadio images
...er.mobi/media/tvos_radios/pPjD9ajR4U.pngRadio images
.../301/swr1-baden-wurttemberg.609d4519.pngRadio images
....mobi/media/tvos_radios/a9a7sa34nvbw.pngRadio images
...dn.sudokuonline.io/static/icons/logo.svgmytuner logo
.../static/images/notifications-request.jpgAccept notifications
...uonline.io/static/images/logo/jigsaw.pngjigsaw 365
...tatic/images/logo/bubbleshooter_logo.pngBubbleshooter
...tatic/images/logo/WordSearch_Logo_1x.pngSolitaire
...uonline.io/static/images/logo/reludi.pngReludi
...static/images/logo/Solitaire_Logo_x1.pngSolitaire
...online.io/static/images/logo/mahjong.pngSolitaire
...ne.io/static/images/logo/minesweeper.svgMinesweeper
...tatic/images/logo/appgeneration_logo.svgappgeneration_logo

Page structure

H1 heading
(Critically important)
Play Sudoku Online
The H1 heading is too short (18 characters). It should be at least 20 Characters long.
Headings
(Important)
There are 30 headings on the page. The amount of headings should be in a more proper relation to the amount of text.

Heading structure

Heading levelContent
H1 Play Sudoku Online
H2 What is Sudoku?
H2 Is Sudoku and Killer Sudoku the same?
H2 How to play Sudoku
H2 Sudoku Tips
H2 Sudoku Puzzle Solving Strategies
H2 Sudoku Solver
H2 Check our latest articles
H2 Killer Sudoku combinations: controlling the cages’ candidates
H2 The 45-rule in Sudoku: what is it and how to apply it
H2 Confirm Action
H2 Well done!
H2 Keep playing
H2 Click the "Allow" button.
H2 We have more online games for you. Play now!
H3 Naked singles
H3 Hidden singles
H3 Naked pairs
H3 Hidden Pairs
H3 Naked Triples
H3 Unlocking possibilities
H3 Don’t try to guess
H3 Keep your grid clean
H3 Practice makes perfect
H3 Crosshatching
H3 Counting
H3 The certainty of the uncertain
H3 The X-Wing method
H3 The Swordfish method
H3 The Jellyfish method
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 12 external links on this page.

Found links on this page

LinkAttributesAnchor text
https://www.sudokuonline.io/IMG-ALT Sudoku Online
/profileNo Text
https://www.sudokuonline.io/loginNo Text
/daily-sudokuNo Text
/tournamentNo Text
https://www.sudokuonline.io/Classic (current)
/daily-sudokuDaily Challenge (current)
/killerKiller (current)
/tournamentTournament (current)
https://www.sudokuonline.io/kidsSudoku for Kids (current)
/profileMy Profile (current)
https://www.sudokuonline.io/loginLogin (current)
/mediumMedium
https://www.sudokuonline.io/hardHard
https://www.sudokuonline.io/evilEvil
/impossibleImpossible
https://play.google.com/store/...New window Nofollow External Subdomain IMG-ALT google play
https://apps.apple.com/app/app...New window Nofollow External Subdomain IMG-ALT apple store
https://www.sudokuonline.io/easySubdomain Easy
/mediumSubdomain Text duplicate Medium
https://www.sudokuonline.io/hardSubdomain Text duplicate Hard
https://www.sudokuonline.io/evilSubdomain Text duplicate Evil
/impossibleSubdomain Text duplicate Impossible
http://www.sudokuonline.io/killerSubdomain Killer Sudoku
https://www.sudokuonline.io/kidsSubdomain Sudoku for kids
/sudoku-solverSubdomain Sudoku Solver
/tips/killer-sudoku-combinationsIMG-ALT post image
/tips/killer-sudoku-combinationsKiller Sudoku combinations: controlling the cages’ candidates
/tips/killer-sudoku-combinationsContinue reading
/tips/the-45-rule-in-sudokuText duplicate IMG-ALT post image
/tips/the-45-rule-in-sudokuThe 45-rule in Sudoku: what is it and how to apply it
/tips/the-45-rule-in-sudokuText duplicate Continue reading
https://play.google.com/store/...New window Nofollow External Subdomain Text duplicate IMG-ALT google play
https://apps.apple.com/app/app...New window Nofollow External Subdomain Text duplicate IMG-ALT apple store
https://mytuner-radio.com/New window External IMG-ALT mytuner logo
https://www.jigsaw365.com/New window External Subdomain Jigsaw 365 Free jigsaw puzzles
IMG-ALT jigsaw 365
https://www.bubbleshooter365.com/New window External Subdomain Bubble Shooter 365 Classic Puzzle Game
IMG-ALT Bubbleshooter
https://www.wordsearch365.com/New window External Subdomain Word Search 365 Classic Word Puzzles
IMG-ALT Solitaire
https://www.reludi.com/New window External Subdomain Reludi Online Games
IMG-ALT Reludi
https://www.solitaire365.com/New window External Subdomain Solitaire 365 Classic Card Games
IMG-ALT Solitaire
https://www.mahjongonline365.com/New window External Subdomain Mahjong Online 365 Classic Puzzle Game
IMG-ALT Solitaire
https://www.minesweeper-online...New window External Subdomain Minesweeper Classic Puzzle Game
IMG-ALT Minesweeper
https://www.sudokuonline.io/easyText duplicate Easy
/mediumText duplicate Medium
https://www.sudokuonline.io/hardText duplicate Hard
https://www.sudokuonline.io/evilText duplicate Evil
/impossibleText duplicate Impossible
/easy-killerText duplicate Easy
/medium-killerText duplicate Medium
/hard-killerText duplicate Hard
/evil-killerText duplicate Evil
/kids/numbers-4-4Numbers 4x4
/kids/numbers-6-6Numbers 6x6
/kids/letters-4-4Letters 4x4
/kids/letters-6-6Letters 6x6
https://www.sudokuonline.io/English
https://www.sudokuonline.io/es/Español
https://www.sudokuonline.io/pt/Português
https://www.sudokuonline.io/de/Deutsch
https://www.sudokuonline.io/fr/Français
https://www.sudokuonline.io/it/Italiano
https://www.sudokuonline.io/ja/日本語
/sudoku-solverText duplicate Sudoku Solver
https://www.sudokuonline.io/tips/Sudoku Tips
https://www.sudokuonline.io/termsTerms
/contactsContact
/privacy-policyPrivacy

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://www.sudokuonline.io/"
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 is excellent with 0.11 seconds.
The file size of the HTML document is fine (212 kB).

HTTP Response Header

NameValue
servernginx
dateFri, 08 Nov 2024 07:22:33 GMT
content-typetext/html; charset=utf-8
content-length27809
x-frame-optionsSAMEORIGIN
cache-controlpublic, max-age=86400
x-cachekeyDE
varyAccept-Language, Cookie, Accept-Encoding
content-languageen
content-encodinggzip
set-cookie153 Characters
report-to{"max_age":86400,"include_subdomains":true,"endpoints":[{"url":"https://games-api.appgeneration.com/log-report-api/"}]}
statuscode200
http_versionHTTP/2

External factors

This website has excellent links from other websites.
This page has backlinks from 119 referring domains.
This page has 878 backlinks.
This page has backlinks from 104 different ip addresses.

Links from Wikipedia

No links from Wikipedia were found.

Robots.txt

User-agent: BLEXBot
Disallow: /

User-agent: MJ12bot
Disallow: /

User-agent: AhrefsBot
Disallow: /

User-agent: TurnitinBot
Disallow: /

User-agent: SEOkicks-Robot
Disallow: /

User-agent: FlipboardProxy
Disallow: /

User-agent: UnwindFetchor
Disallow: /

User-agent: MetaURI
Disallow: /

User-agent: GPTBot
Disallow: /

User-agent: *
Disallow: /search
Disallow: /pt/search
Disallow: /es/search
Disallow: /user

Sitemap: https://www.sudokuonline.io/static/sitemap.xml

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www.sudokuonline.io
Sudoku Online | Free Sudoku Puzzles to Play Online
Play Sudoku Online: solve unlimited free sudoku puzzles from easy, medium, hard and evil difficulty levels. Play it and challenge yourself.

Most important keywords

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

KeywordResultRecheck
Sudoku93%Check
Online93%Check
sudoku online93%Check
Play Online89%Check
Play Sudoku Online89%Check
Play Sudoku88%Check
Play85%Check
sudoku puzzles77%Check
free Sudoku73%Check
killer sudoku68%Check
Show more keywords and terms

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