Tools & Wizards About Us
alterclass.io screenshot

Report Summary

  • 70

    Performance

    Renders faster than
    81% of other websites

  • 86

    Accessibility

    Visual factors better than
    that of 61% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    80% of websites

  • 75

    SEO

    Google-friendlier than
    32% of websites

alterclass.io

The best online courses platform for tech educators - AlterClass

Page Load Speed

218 ms in total

First Response

38 ms

Resources Loaded

116 ms

Page Rendered

64 ms

alterclass.io screenshot

About Website

Visit alterclass.io now to see the best up-to-date Alter Class content and also check out these interesting facts you probably never knew about alterclass.io

Create the best learning experience for your students. Get direct access to your audience and stay in control of pricing and delivery.

Visit alterclass.io

Key Findings

We analyzed Alterclass.io page load time and found that the first response time was 38 ms and then it took 180 ms to load all DOM resources and completely render a web page. This is an excellent result, as only a small number of websites can load faster.

Performance Metrics

alterclass.io performance score

70

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.2 s

78/100

10%

LCP (Largest Contentful Paint)

Value3.6 s

60/100

25%

SI (Speed Index)

Value2.4 s

98/100

10%

TBT (Total Blocking Time)

Value440 ms

64/100

30%

CLS (Cumulative Layout Shift)

Value0.185

66/100

15%

TTI (Time to Interactive)

Value4.1 s

86/100

10%

Network Requests Diagram

alterclass.io

38 ms

caf.js

43 ms

main.f1e2cbae.js

34 ms

main.1b609023.css

36 ms

Our browser made a total of 4 requests to load all elements on the main page. We found that 25% of them (1 request) were addressed to the original Alterclass.io, 50% (2 requests) were made to Img1.wsimg.com and 25% (1 request) were made to Google.com. The less responsive or slowest element that took the longest time to load (43 ms) relates to the external source Google.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 403 B (0%)

Content Size

232.6 kB

After Optimization

232.2 kB

  • HTML
  • JavaScript
  • CSS

In fact, the total size of Alterclass.io main page is 232.6 kB. This result falls within a vast category (top 1 000 000) of heavyweight, probably not optimized, and thus slow loading web pages. Only 5% of websites need less resources to load. Javascripts take 231.3 kB which makes up the majority of the site volume.

HTML Optimization

-38%

Potential reduce by 199 B

  • Original 521 B
  • After minification 521 B
  • After compression 322 B

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 199 B or 38% of the original size.

JavaScript Optimization

-0%

Potential reduce by 152 B

  • Original 231.3 kB
  • After minification 231.3 kB
  • After compression 231.2 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. This website has mostly compressed JavaScripts.

CSS Optimization

-7%

Potential reduce by 52 B

  • Original 768 B
  • After minification 768 B
  • After compression 716 B

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. Alterclass.io has all CSS files already compressed.

Requests Breakdown

We found no issues to fix!

Requests Now

3

After Optimization

3

  • JavaScript
  • CSS

The browser has sent 3 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Alter Class. According to our analytics all requests are already optimized.

Network Requests Diagram

alterclass.io

alterclass.io

38 ms

caf.js

caf.js

43 ms

main.f1e2cbae.js

main.f1e2cbae.js

34 ms

main.1b609023.css

main.1b609023.css

36 ms

Accessibility Review

alterclass.io accessibility score

86

Accessibility Issues

Names and labels

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

Document doesn't have a <title> element

High

<frame> or <iframe> elements do not have a title

Best Practices

alterclass.io best practices score

92

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

High

Page has valid source maps

SEO Factors

alterclass.io SEO score

75

Search Engine Optimization Advices

Content Best Practices

Format your HTML in a way that enables crawlers to better understand your app’s content.

Impact

Issue

High

Document doesn't have a <title> element

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

Page is blocked from indexing

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

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Alterclass.io can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and it matches the claimed language. Our system also found out that Alterclass.io main page’s claimed encoding is utf-8. Use of this encoding format is the best practice as the main page visitors from all over the world won’t have any issues with symbol transcription.

Social Sharing Optimization

alterclass.io

Open Graph description is not detected on the main page of Alter Class. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: