Phet.colorado.edu - SEO Checker

Sign up for free! PDF Export
Overview of the SEO Check
Meta information
79% 
Page quality
42% 
Page structure
58% 
Link structure
65% 
Server
100% 
External factors
100% 
SEO Score
Response time
0.07 s
File size
40.80 kB
Words
187
Media files
13
Number of links
86 internal / 13 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
PhET: Free online physics, chemistry, biology, earth science and math simulations
The page title should be shorter than 580 pixels. It is 732 pixels long. Optimize title
There are no duplicate words in the title
Meta description
(Critically important)
Free science and math simulations for teaching STEM topics, including physics, chemistry, biology, and math, from University of Colorado Boulder
The length of the meta description is perfect. (900 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)
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 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, shrink-to-fit=no
descriptionFree science and math simulations for teaching STEM topics, including physics, chemistry, biology, and math, from University of Colorado Boulder
langen
twitter:site@PhETsims
twitter:titlePhET Interactive Simulations
twitter:cardsummary
twitter:imagehttps://phet.colorado.edu/images/phet-social-media-logo.png
twitter:descriptionFounded in 2002 by Nobel Laureate Carl Wieman, the PhET Interactive Simulations project at the University of Colorado Boulder creates free interactive math and science simulations. PhET sims are based on extensive education <a {{0}}>research</a> and engage students through an intuitive, game-like environment where students learn through exploration and discovery.
og:site_namePhET
og:titlePhET Interactive Simulations
og:urlhttps://phet.colorado.edu/
og:imagehttps://phet.colorado.edu/images/phet-social-media-logo.png
og:descriptionFounded in 2002 by Nobel Laureate Carl Wieman, the PhET Interactive Simulations project at the University of Colorado Boulder creates free interactive math and science simulations. PhET sims are based on extensive education <a {{0}}>research</a> and engage students through an intuitive, game-like environment where students learn through exploration and discovery.
Content-typetext/html;charset=UTF-8
X-UA-CompatibleIE=edge

Test up to 1.000 webpages of phet.colorado.edu with our free plan!

Try For Free
No trial. It's just free!

Page quality

Content
(Critically important)
There are only 187 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
Only 2 paragraph/s was/were found on this page.
20.3% of the text are stop words.
The page contains a listing, which indicates a good text layout.
No placeholders texts or images were found.
There are no duplicates on the site.
The average number of words per sentence of 9.5 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
Multiple viewport tags are given. There should only be one.
No Apple touch icon is specified.
A viewport "width=device-width,initial-scale=1.0" 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)
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
/images/phet-logo-trademarked.pngPhET Home PageGo to the PhET home page
/images/logos/cu_logo.pngUniversity of Colorado
/images/Update_profile_popup.pngNo alt attribute provided
/images/icons/search-icon.pngSearch
/images/ios-app-store-badges/US/badge.svgDownload on the App Store
/images/play_store_badge.pngGoogle Play Badge
/images/devices.svgNo alt attribute provided
...port/Moore_Foundation_logo_footer-01.pngMoore Foundation
/images/support/NSF_logo_footer-01.pngNational Science Foundation
/images/support/hewlett-greyscale.svgHewlett Foundation
/images/support/yidan-footer.pngYidan Prize
/images/support/mastercard-footer.svgMastercard Foundation
/images/phet-logo-trademarked-black.pngPhET Home PageGo to the PhET home page

Page structure

H1 heading
(Critically important)
There is no H1 heading specified.
Headings
(Important)
There are no headings specified on the page. Headings are important for search engine optimization and help to structure your content.

Heading structure

No headings were found.
Some internal links have dynamic parameters. All internal URLs, which are not marked as nofollow, should not contain dynamic parameters.
Some anchor texts are used more than once.
The number of internal links is ok.
None of the anchor texts is too long.
There are 13 external links on this page.

Found links on this page

LinkAttributesAnchor text
https://phet.colorado.edu/Anchor Skip to Main Content
https://phet.colorado.edu/IMG-ALT PhET Home Page
http://www.colorado.edu/New window External Subdomain IMG-ALT University of Colorado
/en/simulations/filter?type=htmlAll Sims
/en/simulations/filter?subject...Physics
/en/simulations/filter?subject...Chemistry
/en/simulations/filter?subject...Math
/en/simulations/filter?subject...Earth Science
/en/simulations/filter?subject...Biology
/en/simulations/translatedTranslated Sims
/en/teaching-resourcesAbout
/en/teaching-resources/tipsFor...Tips for Using PhET
/en/teaching-resources/browse-...Activities
/en/teaching-resources/submit-...Contribute an Activity
/en/teaching-resources/manage-...My Activities
/en/teaching-resources/virtual...Virtual Workshops
/en/researchResearch
/en/inclusive-designInclusive Design
/en/phet-globalPhET Global
/en/deib-in-stem-edDEIB in STEM Ed
/en/donateDonate
/admin/mainAdministration
/en/edit-profile?dest=/Edit profile
/en/edit-profile?dest=/Update Profile
https://www.facebook.com/pages...Nofollow External Subdomain A-TITLE Like us on Facebook
https://twitter.com/PhETSimsNofollow External A-TITLE Follow us on Twitter
https://www.linkedin.com/compa...Nofollow External Subdomain A-TITLE LinkedIn
https://www.instagram.com/phet...Nofollow External Subdomain A-TITLE Follow us on Instagram
https://www.youtube.com/channe...Nofollow External Subdomain A-TITLE Watch us on Youtube
/en/aboutAbout PhET
/en/about/teamOur Team
/en/our-supportersOur Supporters
/en/partnershipsPartnerships
/en/simulations/filter?type=ht...Accessibility
/en/offline-accessOffline Access
/en/help-center/getting-startedHelp Center
/en/privacy-policyPrivacy Policy
/en/about/source-codeSource Code
/en/licensingLicensing
/en/for-translatorsFor Translators
/en/about/contactContact
https://phet.colorado.edu/en/English
https://phet.colorado.edu/ar_SA/العربية
https://phet.colorado.edu/az/Azərbaycanca
https://phet.colorado.edu/eu/Euskara
https://phet.colorado.edu/be/Беларуская
https://phet.colorado.edu/bs/Bosanski
https://phet.colorado.edu/zh_CN/简体中文
https://phet.colorado.edu/zh_TW/正體中文
https://phet.colorado.edu/hr/Hrvatski
https://phet.colorado.edu/cs/Česky
https://phet.colorado.edu/da/Dansk
https://phet.colorado.edu/nl/Nederlands
https://phet.colorado.edu/et/Eesti
https://phet.colorado.edu/fi/Suomi
https://phet.colorado.edu/fr/Français
https://phet.colorado.edu/gl/Galego
https://phet.colorado.edu/ka/ქართული
https://phet.colorado.edu/de/Deutsch
https://phet.colorado.edu/el/Ελληνικά
https://phet.colorado.edu/gu/અંગ્રેજી
https://phet.colorado.edu/hu/Magyar
https://phet.colorado.edu/in/Bahasa Indonesia
https://phet.colorado.edu/it/Italiano
https://phet.colorado.edu/ja/日本語
https://phet.colorado.edu/ko/한국어
https://phet.colorado.edu/ku/كوردي
https://phet.colorado.edu/ku_TR/Kurdî
https://phet.colorado.edu/lt/Lietuvių
https://phet.colorado.edu/mk/Македонски
https://phet.colorado.edu/mr/मराठी
https://phet.colorado.edu/mn/Монгол
https://phet.colorado.edu/nb/Norsk bokmål
https://phet.colorado.edu/nn/Norsk nynorsk
https://phet.colorado.edu/fa/فارسی
https://phet.colorado.edu/pl/Polski
https://phet.colorado.edu/pt/Português
https://phet.colorado.edu/pt_BR/Português do Brasil
https://phet.colorado.edu/ro/Română
https://phet.colorado.edu/sr/Српски
https://phet.colorado.edu/si/සිංහල
https://phet.colorado.edu/sk/Slovensky
https://phet.colorado.edu/es/Español
https://phet.colorado.edu/es_PE/Español Latinoamérica
https://phet.colorado.edu/th/ไทย
https://phet.colorado.edu/tr/Türkçe
https://phet.colorado.edu/uk/Українська
https://phet.colorado.edu/uz/Oʻzbekcha
https://phet.colorado.edu/vi/Tiếng Việt
https://apps.apple.com/us/app/...External Subdomain IMG-ALT Download on the App Store
https://play.google.com/store/...External Subdomain IMG-ALT Google Play Badge
/en/apps-for-schoolsGet Apps for Schools
http://www.moore.org/External Subdomain IMG-ALT Moore Foundation
http://www.nsf.gov/External Subdomain IMG-ALT National Science Foundation
http://www.hewlett.org/External Subdomain IMG-ALT Hewlett Foundation
https://yidanprize.org/External IMG-ALT Yidan Prize
https://mastercardfdn.org/External IMG-ALT Mastercard Foundation
https://phet.colorado.edu/Text duplicate IMG-ALT PhET Home Page
/en/licensing©2024 University of Colorado. Some rights reserved.

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://phet.colorado.edu/"
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 0.07 seconds.
The file size of the HTML document is fine (41 kB).

HTTP Response Header

NameValue
dateFri, 20 Sep 2024 11:13:41 GMT
content-typetext/html;charset=UTF-8
content-security-policyframe-ancestors 'self' openstax.org *.openstax.org
x-frame-optionsSAMEORIGIN
pragmapublic
cache-controlpublic, max-age=86400, stale-if-error=5184000, stale-while-revalidate=5184000, no-store
varyAccept-Encoding
expiresSat, 21 Sep 2024 00:59:08 GMT
content-languageen
age2772
cf-cache-statusHIT
last-modifiedFri, 20 Sep 2024 10:27:29 GMT
servercloudflare
cf-ray8c61633ab962bb9e-FRA
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 9,103 referring domains.
This page has 1,715,614 backlinks.
This page has backlinks from 6,699 different ip addresses.

Links from Wikipedia

You can find more links using Wikipedia search

Robots.txt

User-agent: *
Disallow: /*/unsubscribe
Disallow: /deploy-html-simulation
Disallow: /services/metadata/
Disallow: /files/metadata/
Disallow: /*/services/metadata/documentation
Disallow: /archive/

Similar sites

Search preview

phet.colorado.edu
PhET: Free online physics, chemistry, biology, earth science and ma...
Free science and math simulations for teaching STEM topics, including physics, chemistry, biology, and math, from University of Colorado Boulder

Most important keywords

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

KeywordResultRecheck
PhET63%Check
Colorado59%Check
Physics58%Check
Chemistry58%Check
Science58%Check
math simulations58%Check
Math56%Check
Simulations56%Check
Biology56%Check
Earth Science53%Check
Show more keywords and terms

Test up to 1.000 webpages of phet.colorado.edu with our free plan!

Try For Free
No trial. It's just free!

Cookie Policy

We use cookies to make our site work and also for analytics and advertising purposes. You can enable or disable optional cookies as desired. See the following links for more information.

Contact | Privacy

We need these so the site can function properly

So we can better understand how visitors use our website

So we can serve you tailored ads and promotions