Nibbler SEO audit for phet.colorado.edu
Summary
Overall8.7
The overall score for this website.
Accessibility9.2
How accessible the website is to mobile and disabled users.
The following tests contribute to this score:
Experience8.3
How satisfying the website is likely to be for users.
The following tests contribute to this score:
Marketing9.3
How well marketed, and popular the website is.
The following tests contribute to this score:
Technology7.8
How well designed and built the website is.
The following tests contribute to this score:
Nibbler tested a sample of 5 pages from this website at 00:27 on 18 Mar 2023 (GMT).
Top priorities for website improvement
- Make sure that all the pages of this website include a meta description. If you don't include one, Google will choose a sample of text from the page to appear in the search engine result. By including a meta description, you can control how your search engine result will appear. (read more)
- Consider URL rewriting as an effective and transparent means of creating appropriate URLs. URLs using unusual characters (such as semi-colons or underscores), long numerals or complex phrasing are very difficult for real people to use or exchange. They also tend to be less favoured by search engines. Wherever possible ensure web addresses are 'human readable' - i.e. they should be easy to read, remember and type. In particular, avoid the use of obscure characters (including the underscore, which is not widely understood by non-technical users, or particularly memorable) and long numerals, e.g. example.com/23857984325. (read more)
- Add printable stylesheets for all pages, wherever possible. In most cases, websites can share printable stylesheets over many or all pages, as with screen-based stylesheets. (read more)
Printability0.0
0% of pages are optimised for printing
- 5 pages of this website do not appear to be optimised for printing (using CSS).
- Add printable stylesheets for all pages, wherever possible. In most cases, websites can share printable stylesheets over many or all pages, as with screen-based stylesheets.
Print optimised pages
Page Print phet.colorado.edu/ Not detected phet.colorado.edu/.../filter?type=html,prototype Not detected phet.colorado.edu/.../filter?subjects=physics&type=html,prototype Not detected phet.colorado.edu/.../filter?subjects=chemistry&type=html,prototype Not detected phet.colorado.edu/.../filter?subjects=math&type=html,prototype Not detected
- Add printable stylesheets for all pages, wherever possible. In most cases, websites can share printable stylesheets over many or all pages, as with screen-based stylesheets.
Media specific CSS detected
Meta tags3.6
- All pages include at least some metadata, but only 20.0% of pages have a description meta tag. The description meta data is important as it appears on Google's search result pages.
- Make sure that all the pages of this website include a meta description. If you don't include one, Google will choose a sample of text from the page to appear in the search engine result. By including a meta description, you can control how your search engine result will appear.
Meta Tags (name attribute)
| Page URL | Name | Content |
| phet.colorado.edu/ | viewport | width=device-width,initial-scale=1.0 |
| phet.colorado.edu/ | description | Free science and math simulations for teaching STEM topics, including physics, chemistry, biology, and math, from University of Colorado Boulder |
| phet.colorado.edu/ | viewport | width=device-width, initial-scale=1, shrink-to-fit=no |
| phet.colorado.edu/.../filter?type=html,prototype | viewport | width=device-width,initial-scale=1.0 |
| phet.colorado.edu/.../filter?type=html,prototype | viewport | width=device-width, initial-scale=1, shrink-to-fit=no |
| phet.colorado.edu/.../filter?subjects=physics&type=html,prototype | viewport | width=device-width,initial-scale=1.0 |
| phet.colorado.edu/.../filter?subjects=physics&type=html,prototype | viewport | width=device-width, initial-scale=1, shrink-to-fit=no |
| phet.colorado.edu/.../filter?subjects=chemistry&type=html,prototype | viewport | width=device-width,initial-scale=1.0 |
| phet.colorado.edu/.../filter?subjects=chemistry&type=html,prototype | viewport | width=device-width, initial-scale=1, shrink-to-fit=no |
| phet.colorado.edu/.../filter?subjects=math&type=html,prototype | viewport | width=device-width,initial-scale=1.0 |
| phet.colorado.edu/.../filter?subjects=math&type=html,prototype | viewport | width=device-width, initial-scale=1, shrink-to-fit=no |
Meta Tags (http-equiv attribute)
| Page URL | Name | Content |
| phet.colorado.edu/ | Content-type | text/html;charset=UTF-8 |
| phet.colorado.edu/ | X-UA-Compatible | IE=edge |
| phet.colorado.edu/.../filter?type=html,prototype | Content-type | text/html;charset=UTF-8 |
| phet.colorado.edu/.../filter?type=html,prototype | X-UA-Compatible | IE=edge |
| phet.colorado.edu/.../filter?subjects=physics&type=html,prototype | Content-type | text/html;charset=UTF-8 |
| phet.colorado.edu/.../filter?subjects=physics&type=html,prototype | X-UA-Compatible | IE=edge |
| phet.colorado.edu/.../filter?subjects=chemistry&type=html,prototype | Content-type | text/html;charset=UTF-8 |
| phet.colorado.edu/.../filter?subjects=chemistry&type=html,prototype | X-UA-Compatible | IE=edge |
| phet.colorado.edu/.../filter?subjects=math&type=html,prototype | Content-type | text/html;charset=UTF-8 |
| phet.colorado.edu/.../filter?subjects=math&type=html,prototype | X-UA-Compatible | IE=edge |
URL format3.6
4 URLs are less than ideal
- 4 URLs are particularly hard to type or remember.
- Consider URL rewriting as an effective and transparent means of creating appropriate URLs. URLs using unusual characters (such as semi-colons or underscores), long numerals or complex phrasing are very difficult for real people to use or exchange. They also tend to be less favoured by search engines. Wherever possible ensure web addresses are 'human readable' - i.e. they should be easy to read, remember and type. In particular, avoid the use of obscure characters (including the underscore, which is not widely understood by non-technical users, or particularly memorable) and long numerals, e.g. example.com/23857984325.
- 4 URLs are 'dirty'. 'Dirty' URLs include one or more parameters after a question mark (e.g. www.example.com/?pagename=news), instead of a clean URL (e.g. www.example.com/news). Dirty URLs should generally be avoided wherever possible - they are almost impossible for human beings to remember, may expose the technology of the website to hackers and can confuse search engines among other problems. Their use is sometimes necessary for specific applications, and acceptable in small amounts.
- Remove or reduce the number of query parameters in URLs. Consider URL rewriting as an effective and transparent means of creating appropriate URLs.
Server behaviour6.7
404 page
Compression
- This website handles missing pages correctly by sending a 404 HTTP status code.
- This website was not served using GZIP encoding. GZIP compression is widely supported and reduces the load time of a web page.
- Enable GZIP compression on your web server or in your application.
- Adding or removing a trailing slash to all URLs of this site returns an error page (404). This is OK as no content is being duplicated, but visitors might try browsing to the pages of this website with or without a trailing slash. Ideally, the alternate URL should redirect to the correct page.
- Add a 301 redirect from the other version to the canonical URL.
Unhandled alternate URLs
- Add a 301 redirect from the other version to the canonical URL.
- This test is not applicable as this website appears to be on a subdomain.
Amount of content8.4
Rendering Chart...
- This website has an average of 397 words per page. The amount of content on a website has been shown to correlate with its search engine ranking.
- Consider the amount of text on this website and increase it if appropriate.
Amount of content discovered
Internal links9.7
- 5 links have no text describing their destination. Links on a page should describe their destination for the benefit of both screen readers and search engine spiders.
- Add meaningful anchor text that describes the link's destination. If the link contains an image, ensure you have provided alt text.
Empty link text
- Add meaningful anchor text that describes the link's destination. If the link contains an image, ensure you have provided alt text.
Twitter10.0
This website is linked with the Twitter account @PhETSims
This website's Twitter account has
17,064 followers
- This website was found to link the Twitter account PhET Sims (@PhETSims).
- This website's Twitter account has made 16,587 tweets to 17,064 followers.
Source: Twitter
Mobile10.0
- All of this website appears to be optimised for viewing on a mobile phone or a tablet.
Media specific CSS detected
Analytics10.0
100% of pages use analytics
Multiple Analytics Solutions
- Every page in this website is using some form of analytics software. This is excellent and should allow for a complete analysis of visitor behaviour.
Analytics Software Found
| Software Name |
| Google Analytics |
| Google Tag Manager |
Page titles10.0
100% of pages have defined titles
0% of page titles are weak
- All pages were found to use page titles appropriately. Page titles appear in search results and at the top of the browser's window when visiting the site. Appropriate page titles are particularly important for search engine optimisation.
Headings10.0
- All pages were found to use defined headings. This is excellent as it allows visitors and search engines to summarise the content of webpages quickly. Correctly defined headings aid accessibility and are particularly important for search engine optimisation.
Page headings detail
Incoming links10.0
25,689,811 pages link to this website
40,869 domains link to this website
- There are 25,689,811 pages on 40,869 domains linking to this website. The volume and quality of incoming links is known to influence a website's search engine ranking.
- To appear higher in search engine results, consider link building activity as a way to build your search ranking. Be careful though, because incoming links which are obviously artificial are likely to be detected by search engines and could have an adverse effect.
Source: Ahrefs
Images10.0
0% of images have a clearly defined size
No images are being resized by the browser
- No images have defined sizes.
- Add width and height attributes to all image tags. The width and height you specify should be the same as the source image. If you want to resize an image in the browser, use CSS.
Non Explicitly Sized Images
- Add width and height attributes to all image tags. The width and height you specify should be the same as the source image. If you want to resize an image in the browser, use CSS.
Popularity10.0
506530Estimated monthly organic visitors
- This website appears to have a high number of monthly website visits each month
Source: Ahrefs
Freshness10.0
Last updated January 12, 2023
- It looks like this website was last updated on Thursday, 12 January 2023. This is good because visitors perceive up-to-date websites as more credible. Websites that are updated regularly are also spidered by search engines more often.
- To find this information we used the last modified dates reported by this website's server in addition to looking for dates written on each page.
All dates found
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How does Insites compare?
Nibbler | Insites | |
|---|---|---|
| Tests | 17 fixed tests | 50+ testsCovers SEO, SEM, Google My Business, reviews, social media and much more |
| Add your branding | No | Yes |
| Export & share | No | PDF & link |
| Lead generation | No | Embed on your site |
| Competitor audits | No | Yes |
| Test as a batch | No | Yes |
| Integrations + API | No | Yes |
| Multi-lingual | No | 20+ languages |
| Try it free |
Nibbler tested the following pages
- https://phet.colorado.edu/
- https://phet.colorado.edu/en/simulations/filter?type=html,prototype
- https://phet.colorado.edu/en/simulations/filter?subjects=physics&type=html,prototype
- https://phet.colorado.edu/en/simulations/filter?subjects=chemistry&type=html,prototype
- https://phet.colorado.edu/en/simulations/filter?subjects=math&type=html,prototype