Illusionsindex.org - SEO Checker

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Overview of the SEO Check
Meta information
100% 
Page quality
45% 
Page structure
45% 
Link structure
92% 
Server
100% 
External factors
100% 
SEO Score
Response time
0.36 s
File size
28.70 kB
Words
312
Media files
10
Number of links
34 internal / 11 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
Home - The Illusions Index
The length of the page title is perfect. (239 pixels out of 580 max pixel length)
There are no duplicate words in the title
Meta description
(Critically important)
The Illusions Index is a fully searchable curated collection of illusions brought to you by the Centre for the Study of Perceptual Experience.
The length of the meta description is perfect. (847 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 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)
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
viewportwidth=device-width, initial-scale=1
authorThe Illusions Index
keywordsillusions, hallucination, perception, the senses, philosophy, psychology, index, resource, research
descriptionThe Illusions Index is a fully searchable curated collection of illusions brought to you by the Centre for the Study of Perceptual Experience.
langen
twitter:cardsummary
twitter:urlhttps://www.illusionsindex.org
og:titleHome - The Illusions Index
og:urlhttps://www.illusionsindex.org
og:site_nameThe Illusions Index
charsetutf-8

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Page quality

Content
(Critically important)
Words from the H1 heading are not used in the page content.
There are only 312 words on this page. Good pages should have about 800 words of useful content.
43.3% 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.
5 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 15.86 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)
10 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
.../253271/414x113/3fbdceee30/logo-home.pngNo alt attribute provided
...1/ee30d40527/ico-search-dark.png/m/30x29No alt attribute provided
...1/ee30d40527/ico-search-dark.png/m/20x19No alt attribute provided
.../138x188/e5721d6512/explore_index.png/m/No alt attribute provided
...71/166x140/0c560624b2/surprise_me.png/m/No alt attribute provided
...253271/200x62/a8b4247cec/logo-uog.png/m/No alt attribute provided
...53271/220x54/ab22988437/logo-cspe.png/m/No alt attribute provided
...53271/120x139/0341684f1a/logo-footer.pngNo alt attribute provided
...70x70/738b9836c7/ico-twitter.png/m/35x35No alt attribute provided
...0x70/389bc641fc/ico-facebook.png/m/35x35No alt attribute provided

Page structure

H1 heading
(Critically important)
Investigate Your Senses
Too many H1 headings
Headings
(Important)
Some headings occur twice on the page.
The structure of headings is missing one or more levels. Do not skip heading levels.

Heading structure

Heading levelContent
H1 Investigate Your Senses
H1 Welcome to The Illusions Index
H3 Recent Additions
H3 UofG CSPE on Twitter
H3 UofG CSPE on Twitter Duplicate text
H3 Master of Illusions Quiz
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 11 external links on this page.

Found links on this page

LinkAttributesAnchor text
https://www.illusionsindex.org/No Text
/homeHOME
/aboutABOUT
https://www.illusionsindex.org/i/EXPLORE
/suggestSUGGEST
/donateDONATE
/feedbackFEEDBACK
http://quiz.illusionsindex.org/External Subdomain QUIZ
https://www.illusionsindex.org/Anchor No Text
/homeHome
/aboutAbout
https://www.illusionsindex.org/i/Explore
/suggestSuggest
/donateDonate
/feedbackFeedback
http://quiz.illusionsindex.org/External Subdomain Quiz
https://www.illusionsindex.org/i/Explore Illusions
/i/duck-rabbitDuck-Rabbit
/i/grey-strawberriesGrey strawberries
/i/skipping-pylonSkipping Pylon
/i/troxler-effectTroxler Effect
https://www.illusionsindex.org/iVIEW MORE
/i/waterfall-illusionWaterfall Illusion
https://www.illusionsindex.org/iText duplicate VIEW MORE
http://www.gla.ac.uk/cspeExternal Subdomain Centre for the Study of Perceptual Experience
https://www.illusionsindex.org/i/Text duplicate Explore Illusions
/i/flash-lag-illusionFlash-lag Illusion
/i/skipping-pylonText duplicate Skipping Pylon
/i/sound-induced-flash-illusionSound-Induced Flash Illusion
https://www.illusionsindex.org/riShow Random Illusion
https://twitter.com/uofgcspeExternal UofG CSPE on Twitter
https://quiz.illusionsindex.org/External Subdomain Beat the quiz
https://www.gla.ac.uk/External Subdomain No Text
https://www.gla.ac.uk/cspe/External Subdomain No Text
/homeText duplicate HOME
/aboutText duplicate ABOUT
https://www.illusionsindex.org/i/Text duplicate EXPLORE
/suggestText duplicate SUGGEST
/donateText duplicate DONATE
/feedbackText duplicate FEEDBACK
http://quiz.illusionsindex.org/External Subdomain Text duplicate QUIZ
https://www.illusionsindex.org/Subdomain No Text
https://twitter.com/UofGCSPENew window External No Text
https://www.facebook.com/UofGCSPENew window External Subdomain No Text
https://www.muckypuddle.com/External Subdomain Mucky Puddle

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://www.illusionsindex.org/"
HTTP header
(Important)
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 0.36 seconds.
The file size of the HTML document is fine (29 kB).

HTTP Response Header

NameValue
servernginx
content-typetext/html; charset=UTF-8
varyAccept-Encoding
cache-controlno-cache, private
dateFri, 18 Apr 2025 15:13:10 GMT
set-cookie428 Characters
x-frame-optionsALLOW-FROM https://app.storyblok.com
x-xss-protection1; mode=block
x-content-type-optionsnosniff
content-encodinggzip
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 39 referring domains.
This page has 90 backlinks.
This page has backlinks from 29 different ip addresses.

Links from Wikipedia

You can find more links using Wikipedia search

Robots.txt

User-agent: *
Disallow:

Similar sites

Search preview

www.illusionsindex.org
Home - The Illusions Index
The Illusions Index is a fully searchable curated collection of illusions brought to you by the Centre for the Study of Perceptual Experience.

Most important keywords

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

KeywordResultRecheck
Illusions Index78%Check
Illusions77%Check
Index75%Check
illusions brought63%Check
Explore Illusions58%Check
Senses50%Check
Investigate50%Check
Perceptual46%Check
Experience46%Check
Centre46%Check
Show more keywords and terms

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