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90 khanacademy.org Last Updated: 2 years

Success 78% of passed verification steps

Warning 7% of total warning

Errors 15% of total errors, require fast action

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 | FREE ONLINE COURSES, LESSONS & PRACTICE

Meta Description 101 Characters

You can learn anything. Expert-created content and resources for every course and level. Always free.

Effective URL 27 Characters

https://www.khanacademy.org

Excerpt Page content

Khan Academy | Free 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 | FREE ONLINE COURSES, LESSONS & PRACTICE

https://www.khanacademy.org

You can learn anything. Expert-created content and resources for every course and level. Always free.

Robots.txt File Detected

http://khanacademy.org/robots.txt

Sitemap.xml File Detected

http://khanacademy.org/sitemap.xml

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 / 2 years

Create on: 2006-03-14 / 15 years

Expires on: 2024-03-14 / 31 months 29 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

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

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

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

Avoids an excessive DOM size 823 elements

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

Only Registered Users

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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

Type	Name	Value	Class	TTL
A	khanacademy.org	99.86.230.49	IN	59
A	khanacademy.org	99.86.230.97	IN	59
A	khanacademy.org	99.86.230.55	IN	59
A	khanacademy.org	99.86.230.88	IN	59
NS	khanacademy.org	ns-1664.awsdns-16.co.uk	IN	86400
NS	khanacademy.org	ns-1489.awsdns-58.org	IN	86400
NS	khanacademy.org	ns-798.awsdns-35.net	IN	86400
NS	khanacademy.org	ns-125.awsdns-15.com	IN	86400
MX	khanacademy.org	aspmx.l.google.com	IN	300
MX	khanacademy.org	alt1.aspmx.l.google.com	IN	300
MX	khanacademy.org	aspmx2.googlemail.com	IN	300
MX	khanacademy.org	aspmx3.googlemail.com	IN	300
MX	khanacademy.org	alt2.aspmx.l.google.com	IN	300
TXT	khanacademy.org	google-site-verification=SprWzGYoIdXdFrUCSyBhXJtHzFjE8FAQNlTamgKenhU	IN	300
TXT	khanacademy.org	globalsign-domain-verification=qV_5Us2mt6FO1Ig5hnG4kYHESYAxuH5-qZ0cRXC-Ig	IN	300
TXT	khanacademy.org	google-site-verification=sHrvDlgokhtbjBWsn8Dhu616EFRRv8GD0C1AU4_1gl4	IN	300
TXT	khanacademy.org	_globalsign-domain-verification=e70UZqvudGByIeilV8oO0gubBZi0P7QLakTxKub-zS	IN	300
TXT	khanacademy.org	google-site-verification=Jiabx8hC-zV0E8-hAj40dHCY_oWNIvfqkNe7VFnGbCs	IN	300
TXT	khanacademy.org	_globalsign-domain-verification=Prrz12gznJzJiHaajX3CnPfpqK6hhLae0miMSZ_BGa	IN	300
TXT	khanacademy.org	facebook-domain-verification=8kvuco8ljlv8t1aedswjypctrp1pk3	IN	300
TXT	khanacademy.org	google-site-verification=JML6gcy7DbE1dA3JB9W4O6EB9uQ8bpOlJTyniVCgd-o	IN	300
TXT	khanacademy.org	spf2.0/pra include:_spf.google.com include:sendgrid.net include:aspmx.sailthru.com include:mailgun.org include:_netblocks.khanacademy.org -all	IN	300
TXT	khanacademy.org	google-site-verification=y1w1HGdtmQcg92Uy4JtubYkFtDDshCwmDXTFCgjpr-Y	IN	300
TXT	khanacademy.org	botify-site-verification=sGRcFNKzIkHzx1jtsQ7YkiT8hgWB6RiU	IN	300
TXT	khanacademy.org	v=spf1 include:_spf.google.com include:sendgrid.net include:aspmx.sailthru.com include:mailgun.org include:_netblocks.khanacademy.org -all	IN	300

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90 khanacademy.org Last Updated: 2 years

Desktop

Mobile

Estimation Traffic and Earnings

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Technologies

Google App Engine

Google Tag Manager

Varnish

PWA - Manifest

Desktop

Mobile

Speed And Optimization Tips

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Alexa Rank

0

Information Server

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