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Top Technologies

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Web Frameworks

90 khanacademy.org Last Updated: 7 months

Success 78% of passed verification steps
Warning 7% of total warning
Errors 15% of total errors, require fast action

Desktop

Mobile

Performance Desktop Score 91%
Best Practices Desktop Score 85%
SEO Desktop Score 90%
Progressive Web App Desktop Score 31%
Performance Mobile Score 48%
Best Practices Mobile Score 85%
SEO Mobile Score 90%
Progressive Web App Mobile Score 33%
Page Authority Authority 68%
Domain Authority Domain Authority 92%
Moz Rank 6.8/10
Bounce Rate Rate 0%
Charset Encoding
Great, language/character encoding is specified: UTF-8
Title Tag 58 Characters
KHAN ACADEMY |--- ONLINE COURSES, LESSONS & PRACTICE
Meta Description 101 Characters
You can learn anything. Expert-created content and resources for every course and level. Always---.
Effective URL 27 Characters
https://www.khanacademy.org
Excerpt Page content
Khan Academy |--- Online Courses, Lessons & Practice ...
Keywords Cloud Density
academy12 khan12 teachers11 start8 here8 learners7 districts7 students6 their6 education4
Keyword Consistency Keyword density is one of the main terms in SEO
Keyword Freq Title Desc Domain H1 H2
academy 12
khan 12
teachers 11
start 8
here 8
learners 7
districts 7
students 6
their 6
education 4
Google Preview Your look like this in google search result
KHAN ACADEMY |--- ONLINE COURSES, LESSONS & PRACTICE
https://www.khanacademy.org
You can learn anything. Expert-created content and resources for every course and level. Always---.
Robots.txt File Detected
Sitemap.xml File Detected
Whois Is a query and response protocol that is widely used for querying databases that store the registered users or assignees of an Internet resource, such as a domain name, an IP address block, or an autonomous system
Updated: 2019-03-15 / 1 year
Create on: 2006-03-14 / 14 years
Expires on: 2024-03-14 / 43 months 23 days

GoDaddy.com, LLC ,US
Registrar Whois Server: whois.godaddy.com
Registrar URL: http://www.whois.godaddy.com

Nameservers
NS-1489.AWSDNS-58.ORG
NS-125.AWSDNS-15.COM
NS-1664.AWSDNS-16.CO.UK
NS-798.AWSDNS-35.NET
Page Size Code & Text Ratio
Document Size: ~222.04 KB
Code Size: ~102.83 KB
Text Size: ~119.2 KB Ratio: 53.69%

Estimation Traffic and Earnings

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Technologies

PWA - Manifest

Manifest is not valid
Your site don't have valid manifest.json, read more in Web App Manifest

Desktop

Desktop Screenshot
Serve images in next-gen formats Potential savings of 14 KB
Image formats like JPEG 2000, JPEG XR, and WebP often provide better compression than PNG or JPEG, which means faster downloads and less data consumption
Server response times are low (TTFB) Root document took 240 ms
Time To First Byte identifies the time at which your server sends a response
Eliminate render-blocking resources Potential savings of 270 ms
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles
Minimize third-party usage Third-party code blocked the main thread for 0 ms
Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading
Total Blocking Time 90 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds.
JavaScript execution time 0.8 s
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this
Server Backend Latencies 0 ms
Server latencies can impact web performance. If the server latency of an origin is high, it's an indication the server is overloaded or has poor backend performance
Defer offscreen images Potential savings of 42 KB
Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive
Properly size images Potential savings of 32 KB
Serve images that are appropriately-sized to save cellular data and improve load time
Speed Index 1.1 s
Speed Index shows how quickly the contents of a page are visibly populated
First CPU Idle 2.3 s
First CPU Idle marks the first time at which the page's main thread is quiet enough to handle input. [Learn more](https://web.dev/first-cpu-idle).
Avoids enormous network payloads Total size was 1,674 KB
Large network payloads cost users real money and are highly correlated with long load times
Minimizes main-thread work 1.4 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
First Contentful Paint 0.9 s
First Contentful Paint marks the time at which the first text or image is painted
Includes front-end JavaScript libraries with known security vulnerabilities 3 vulnerabilities detected
Some third-party scripts may contain known security vulnerabilities that are easily identified and exploited by attackers
Avoid chaining critical requests 6 chains found
The Critical Request Chains below show you what resources are loaded with a high priority. Consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load
Avoids an excessive DOM size 823 elements
A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow)
First Meaningful Paint 0.9 s
First Meaningful Paint measures when the primary content of a page is visible
Keep request counts low and transfer sizes small 155 requests • 1,674 KB
To set budgets for the quantity and size of page resources, add a budget.json file
Uses efficient cache policy on static assets 2 resources found
A long cache lifetime can speed up repeat visits to your page
Max Potential First Input Delay 140 ms
The maximum potential First Input Delay that your users could experience is the duration, in milliseconds, of the longest task
Time to Interactive 2.6 s
Time to interactive is the amount of time it takes for the page to become fully interactive
Links do not have descriptive text 1 link found
Descriptive link text helps search engines understand your content
Network Round Trip Times 0 ms
Network round trip times (RTT) have a large impact on performance. If the RTT to an origin is high, it's an indication that servers closer to the user could improve performance
Page load is not fast enough on mobile networks Interactive on simulated mobile network at 13.7 s
A fast page load over a cellular network ensures a good mobile user experience
Estimated Input Latency 10 ms
Estimated Input Latency is an estimate of how long your app takes to respond to user input, in milliseconds, during the busiest 5s window of page load. If your latency is higher than 50 ms, users may perceive your app as laggy
Minify CSS Potential savings of 3 KB
Minifying CSS files can reduce network payload sizes
Remove unused CSS Potential savings of 13 KB
Remove dead rules from stylesheets and defer the loading of CSS not used for above-the-fold content to reduce unnecessary bytes consumed by network activity

Mobile

Mobile Screenshot
Uses efficient cache policy on static assets 2 resources found
A long cache lifetime can speed up repeat visits to your page
Max Potential First Input Delay 620 ms
The maximum potential First Input Delay that your users could experience is the duration, in milliseconds, of the longest task
Time to Interactive 13.7 s
Time to interactive is the amount of time it takes for the page to become fully interactive
Links do not have descriptive text 1 link found
Descriptive link text helps search engines understand your content
Network Round Trip Times 0 ms
Network round trip times (RTT) have a large impact on performance. If the RTT to an origin is high, it's an indication that servers closer to the user could improve performance
Page load is not fast enough on mobile networks Interactive at 13.7 s
A fast page load over a cellular network ensures a good mobile user experience
Estimated Input Latency 250 ms
Estimated Input Latency is an estimate of how long your app takes to respond to user input, in milliseconds, during the busiest 5s window of page load. If your latency is higher than 50 ms, users may perceive your app as laggy
First Contentful Paint (3G) 7035 ms
First Contentful Paint 3G marks the time at which the first text or image is painted while on a 3G network
Minify CSS Potential savings of 3 KB
Minifying CSS files can reduce network payload sizes
Tap targets are not sized appropriately 95% appropriately sized tap targets
Interactive elements like buttons and links should be large enough (48x48px), and have enough space around them, to be easy enough to tap without overlapping onto other elements
Document uses legible font sizes 96.6% legible text
Font sizes less than 12px are too small to be legible and require mobile visitors to “pinch to zoom” in order to read. Strive to have >60% of page text ≥12px
Remove unused CSS Potential savings of 13 KB
Remove dead rules from stylesheets and defer the loading of CSS not used for above-the-fold content to reduce unnecessary bytes consumed by network activity
Serve images in next-gen formats Potential savings of 14 KB
Image formats like JPEG 2000, JPEG XR, and WebP often provide better compression than PNG or JPEG, which means faster downloads and less data consumption
Server response times are low (TTFB) Root document took 210 ms
Time To First Byte identifies the time at which your server sends a response
Eliminate render-blocking resources Potential savings of 450 ms
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles
Minimize third-party usage Third-party code blocked the main thread for 100 ms
Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading
Total Blocking Time 1,540 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds.
Reduce JavaScript execution time 3.5 s
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this
Server Backend Latencies 0 ms
Server latencies can impact web performance. If the server latency of an origin is high, it's an indication the server is overloaded or has poor backend performance
Defer offscreen images Potential savings of 42 KB
Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive
Speed Index 5.4 s
Speed Index shows how quickly the contents of a page are visibly populated
First CPU Idle 3.4 s
First CPU Idle marks the first time at which the page's main thread is quiet enough to handle input. [Learn more](https://web.dev/first-cpu-idle).
Avoids enormous network payloads Total size was 1,673 KB
Large network payloads cost users real money and are highly correlated with long load times
Minimize main-thread work 5.3 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
First Contentful Paint 3.4 s
First Contentful Paint marks the time at which the first text or image is painted
Includes front-end JavaScript libraries with known security vulnerabilities 3 vulnerabilities detected
Some third-party scripts may contain known security vulnerabilities that are easily identified and exploited by attackers
Avoid chaining critical requests 6 chains found
The Critical Request Chains below show you what resources are loaded with a high priority. Consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load
Avoids an excessive DOM size 823 elements
A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow)
First Meaningful Paint 3.4 s
First Meaningful Paint measures when the primary content of a page is visible
Keep request counts low and transfer sizes small 155 requests • 1,673 KB
To set budgets for the quantity and size of page resources, add a budget.json file

Speed And Optimization Tips

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Alexa Rank

0

Local Rank: / Users: / PageViews:

Global Rank

Information Server

Response Header HTTP headers carry information about the client browser, the requested page and the server
HTTP/1.1 200 OK
Content-Type: text/html; charset=utf-8
Cache-Control: no-cache
Set-Cookie: fkey=1.0_HdL94xGGQt8M-g==_1577338355; Path=/
X-Frame-Options: SAMEORIGIN
X-Content-Type-Options: nosniff
Set-Cookie: gae_b_id=!$GzGc7LaWYaMFctI-i76l8qJvubw_-9DVimDBBfLZXEk.%q33u2b%1$a2FpZF8zNjQzNjYzMzI3NTM3Njk4MDM5NDYxMzY; expires=Fri, 25 Dec 2020 05:32:35 GMT; httponly; Max-Age=31536000; Path=/; secure
Set-Cookie: ka_session=w5VlRuD5g1CQi81IU829nNLSVnvEc-Sv4YsIIHoJ:1577338355:1577338355:1:; expires=Fri, 25 Dec 2020 05:32:35 GMT; Max-Age=31536000; Path=/
Content-Encoding: gzip
X-Cloud-Trace-Context: 108c01e2007a3e6c13442356f972408b
Server: Google Frontend
Expires: Thu, 26 Dec 2019 05:32:36 GMT
Accept-Ranges: bytes
Via: 1.1 varnish
Accept-Ranges: bytes
Transfer-Encoding: chunked
Accept-Ranges: bytes
Date: Thu, 26 Dec 2019 05:32:36 GMT
Via: 1.1 varnish
Age: 0
Connection: keep-alive
X-Served-By: cache-mdw17379-MDW, cache-jfk8128-JFK
X-Cache: MISS, MISS
X-Cache-Hits: 0, 0
X-Timer: S1577338356.871850,VS0,VE172
Vary: Accept-Encoding
DNS Records DNS Resource Records associated with a hostname
View DNS Records

Comments

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