Tools & Wizards About Us
zearn.org screenshot

Report Summary

  • 28

    Performance

    Renders faster than
    48% of other websites

  • 91

    Accessibility

    Visual factors better than
    that of 77% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 100

    SEO

    Google-friendlier than
    95% of websites

zearn.org

Zearn Math | Top-rated Math Learning Platform

Page Load Speed

2.1 sec in total

First Response

75 ms

Resources Loaded

1.8 sec

Page Rendered

186 ms

zearn.org screenshot

About Website

Visit zearn.org now to see the best up-to-date Zearn content for United States and also check out these interesting facts you probably never knew about zearn.org

Learning with Zearn helps math make sense. Students explore math through pictures, visual models, and real-life examples. Free for teachers, always. Sign Up.

Visit zearn.org

Key Findings

We analyzed Zearn.org page load time and found that the first response time was 75 ms and then it took 2 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 40% of websites can load faster.

Performance Metrics

zearn.org performance score

28

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value15.0 s

0/100

10%

LCP (Largest Contentful Paint)

Value15.5 s

0/100

25%

SI (Speed Index)

Value15.0 s

1/100

10%

TBT (Total Blocking Time)

Value700 ms

42/100

30%

CLS (Cumulative Layout Shift)

Value0.042

99/100

15%

TTI (Time to Interactive)

Value15.8 s

6/100

10%

Network Requests Diagram

zearn.org

75 ms

www.zearn.org

100 ms

application-78fbb5bbed4e7f0952a94682771cc3403237f5b122c49904523e50eeb06c0e9e.css

153 ms

includes-0f6422d707ea5016a3dc1c88f9f319f49760010a2a8c62001af5828c4f680653.js

123 ms

application-4a8c4bbf2baa276fdcd8d37e851b1082c6003a7c0ae4951a1d7773343a314856.js

505 ms

Our browser made a total of 37 requests to load all elements on the main page. We found that 5% of them (2 requests) were addressed to the original Zearn.org, 24% (9 requests) were made to Dent-demo.s3.amazonaws.com and 14% (5 requests) were made to Ssl.google-analytics.com. The less responsive or slowest element that took the longest time to load (728 ms) relates to the external source Dent-demo.s3.amazonaws.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 8.1 MB (80%)

Content Size

10.1 MB

After Optimization

2.0 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Zearn.org main page is 10.1 MB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 55% of websites need less resources to load. CSS take 5.8 MB which makes up the majority of the site volume.

HTML Optimization

-69%

Potential reduce by 22.6 kB

  • Original 32.7 kB
  • After minification 30.4 kB
  • After compression 10.1 kB

HTML content can be minified and compressed by a website’s server. The most efficient way is to compress content using GZIP which reduces data amount travelling through the network between server and browser. HTML code on this page is well minified. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 22.6 kB or 69% of the original size.

Image Optimization

-0%

Potential reduce by 1.2 kB

  • Original 1.0 MB
  • After minification 1.0 MB

Image size optimization can help to speed up a website loading time. The chart above shows the difference between the size before and after optimization. Zearn images are well optimized though.

JavaScript Optimization

-78%

Potential reduce by 2.5 MB

  • Original 3.3 MB
  • After minification 3.3 MB
  • After compression 726.4 kB

It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 2.5 MB or 78% of the original size.

CSS Optimization

-96%

Potential reduce by 5.5 MB

  • Original 5.8 MB
  • After minification 3.7 MB
  • After compression 248.6 kB

CSS files minification is very important to reduce a web page rendering time. The faster CSS files can load, the earlier a page can be rendered. Zearn.org needs all CSS files to be minified and compressed as it can save up to 5.5 MB or 96% of the original size.

Requests Breakdown

Number of requests can be reduced by 12 (39%)

Requests Now

31

After Optimization

19

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 31 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Zearn. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 9 to 1 for JavaScripts and from 5 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

zearn.org

zearn.org

75 ms

www.zearn.org

www.zearn.org

100 ms

application-78fbb5bbed4e7f0952a94682771cc3403237f5b122c49904523e50eeb06c0e9e.css

application-78fbb5bbed4e7f0952a94682771cc3403237f5b122c49904523e50eeb06c0e9e.css

153 ms

includes-0f6422d707ea5016a3dc1c88f9f319f49760010a2a8c62001af5828c4f680653.js

includes-0f6422d707ea5016a3dc1c88f9f319f49760010a2a8c62001af5828c4f680653.js

123 ms

application-4a8c4bbf2baa276fdcd8d37e851b1082c6003a7c0ae4951a1d7773343a314856.js

application-4a8c4bbf2baa276fdcd8d37e851b1082c6003a7c0ae4951a1d7773343a314856.js

505 ms

jwplayer.js

jwplayer.js

115 ms

css

css

109 ms

font-awesome.min.css

font-awesome.min.css

73 ms

css

css

127 ms

ga.js

ga.js

143 ms

285_color.png

285_color.png

279 ms

147651609

147651609

271 ms

147722281

147722281

193 ms

145144502

145144502

200 ms

zearnlogo.svg

zearnlogo.svg

148 ms

carousel1.jpg

carousel1.jpg

728 ms

carousel2.jpg

carousel2.jpg

253 ms

carousel3.jpg

carousel3.jpg

270 ms

carousel4.jpg

carousel4.jpg

257 ms

carousel5.jpg

carousel5.jpg

261 ms

carousel6.jpg

carousel6.jpg

261 ms

testdrive.gif

testdrive.gif

264 ms

f8OBjBbevvywgbyJOxlO7Q.ttf

f8OBjBbevvywgbyJOxlO7Q.ttf

130 ms

AwBqWF2kjhlybWamaKMPcaCWcynf_cDxXwCLxiixG1c.ttf

AwBqWF2kjhlybWamaKMPcaCWcynf_cDxXwCLxiixG1c.ttf

135 ms

yVHpdQrmTj9Kax1tmFSx2qCWcynf_cDxXwCLxiixG1c.ttf

yVHpdQrmTj9Kax1tmFSx2qCWcynf_cDxXwCLxiixG1c.ttf

137 ms

fontawesome-webfont.woff

fontawesome-webfont.woff

81 ms

__utm.gif

__utm.gif

22 ms

player.js

player.js

135 ms

player.css

player.css

119 ms

vuid.min.js

vuid.min.js

111 ms

__utm.gif

__utm.gif

55 ms

__utm.gif

__utm.gif

28 ms

__utm.gif

__utm.gif

13 ms

proxy.html

proxy.html

87 ms

nr-885.min.js

nr-885.min.js

44 ms

689d5b4562

689d5b4562

115 ms

689d5b4562

689d5b4562

127 ms

Accessibility Review

zearn.org accessibility score

91

Accessibility Issues

ARIA

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

[aria-*] attributes do not have valid values

Best Practices

zearn.org best practices score

83

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

High

Missing source maps for large first-party JavaScript

SEO Factors

zearn.org SEO score

100

Search Engine Optimization Advices

Mobile Friendly

Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. [Learn more](https://developers.google.com/search/mobile-sites/).

Impact

Issue

High

Document uses legible font sizes

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    N/A

  • Encoding

    N/A

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Zearn.org can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Zearn.org main page’s claimed encoding is . Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

zearn.org

Open Graph data is detected on the main page of Zearn. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: