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55 code.org Last Updated: 3 years

Success 63% of passed verification steps
Warning 7% of total warning
Errors 30% of total errors, require fast action
Share

Desktop

Mobile

Performance Desktop Score 92%
Best Practices Desktop Score 80%
SEO Desktop Score 73%
Progressive Web App Desktop Score 45%
Performance Mobile Score 46%
Best Practices Mobile Score 73%
SEO Mobile Score 72%
Progressive Web App Mobile Score 50%
Page Authority Authority 70%
Domain Authority Domain Authority 82%
Moz Rank 7.0/10
Bounce Rate Rate 0%
charset Encoding
Great, language/character encoding is specified: UTF-8
Title Tag 50 Characters
LEARN TODAY, BUILD A BRIGHTER TOMORROW. | CODE.ORG
Meta Description 0 Characters
NO DATA
Effective URL 16 Characters
https://code.org
Excerpt Page content
Learn today, build a brighter tomorrow. | Code.org   Your browser is not supported. Please upgrade your browser to one of our supported browsers. You can try viewing the page, but expect functionality to be broke...
Keywords Cloud Density
code19 school10 support6 norsk6 español6 português6 learn5 projects5 about5 amazon5
Keyword Consistency Keyword density is one of the main terms in SEO
Keyword Freq Title Desc Domain H1 H2
code 19
school 10
support 6
norsk 6
español 6
português 6
learn 5
projects 5
about 5
amazon 5
Google Preview Your look like this in google search result
LEARN TODAY, BUILD A BRIGHTER TOMORROW. | CODE.ORG
https://code.org
Learn today, build a brighter tomorrow. | Code.org   Your browser is not supported. Please upgrade your browser to one of our supported browsers. You can try viewing the page, but expect functionality to be broke...
Robots.txt File Detected
http://code.org/robots.txt
Sitemap.xml File No Found
http://code.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: 2019-07-16 / 5 years
Create on: 1999-09-28 / 25 years
Expires on: 2022-09-28 / 19 months 8 days

Amazon Registrar, Inc. ,US
Registrar Whois Server: whois.registrar.amazon.com
Registrar URL: registrar.amazon.com

Nameservers
NS-1497.AWSDNS-59.ORG
NS-1652.AWSDNS-14.CO.UK
NS-269.AWSDNS-33.COM
NS-678.AWSDNS-20.NET
Page Size Code & Text Ratio
Document Size: ~139.57 KB
Code Size: ~48.46 KB
Text Size: ~91.12 KB Ratio: 65.28%

Social Data

Delicious Total: 0
Facebook Total: 652,262
Google Total: 0
Linkedin Total: 0
Pinterest Total: 4
Stumbleupon Total: 0
Tumblr Total: 0
Vk Total: 0

Estimation Traffic and Earnings

43,295
Unique Visits
Daily
80,095
Pages Views
Daily
$78
Income
Daily
1,212,260
Unique Visits
Monthly
2,282,708
Pages Views
Monthly
$1,950
Income
Monthly
14,027,580
Unique Visits
Yearly
26,911,920
Pages Views
Yearly
$20,592
Income
Yearly

Technologies

PWA - Manifest

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

Desktop

Desktop Screenshot
Avoid non-composited animations 1 animated element found
Animations which are not composited can be janky and increase CLS
Avoid chaining critical requests 5 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
Time to Interactive 2.0 s
Time to interactive is the amount of time it takes for the page to become fully interactive
First Meaningful Paint 0.9 s
First Meaningful Paint measures when the primary content of a page is visible
Minimizes main-thread work 1.0 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
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
First CPU Idle 1.5 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/).
Remove unused JavaScript Potential savings of 221 KiB
Remove unused JavaScript to reduce bytes consumed by network activity
Speed Index 1.3 s
Speed Index shows how quickly the contents of a page are visibly populated
JavaScript execution time 0.4 s
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this
Includes front-end JavaScript libraries with known security vulnerabilities 8 vulnerabilities detected
Some third-party scripts may contain known security vulnerabilities that are easily identified and exploited by attackers
Remove unused CSS Potential savings of 109 KiB
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
Eliminate render-blocking resources Potential savings of 460 ms
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles
First Contentful Paint 0.9 s
First Contentful Paint marks the time at which the first text or image is painted
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
Largest Contentful Paint 1.5 s
Largest Contentful Paint marks the time at which the largest text or image is painted
Keep request counts low and transfer sizes small 40 requests • 1,013 KiB
To set budgets for the quantity and size of page resources, add a budget.json file
Properly size images Potential savings of 26 KiB
Serve images that are appropriately-sized to save cellular data and improve load time
Avoids an excessive DOM size 603 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)
User Timing marks and measures 1 user timing
Consider instrumenting your app with the User Timing API to measure your app's real-world performance during key user experiences
Initial server response time was short Root document took 70 ms
Keep the server response time for the main document short because all other requests depend on it
Web app manifest or service worker do not meet the installability requirements 1 reason
Service worker is the technology that enables your app to use many Progressive Web App features, such as offline, add to homescreen, and push notifications. With proper service worker and manifest implementations, browsers can proactively prompt users to add your app to their homescreen, which can lead to higher engagement
Max Potential First Input Delay 190 ms
The maximum potential First Input Delay that your users could experience is the duration of the longest task
Minimize third-party usage Third-party code blocked the main thread for 60 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
Avoid large layout shifts 1 element found
These DOM elements contribute most to the CLS of the page.
Avoid long main-thread tasks 3 long tasks found
Lists the longest tasks on the main thread, useful for identifying worst contributors to input delay
Defer offscreen images Potential savings of 12 KiB
Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive
Total Blocking Time 20 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds
Serve images in next-gen formats Potential savings of 55 KiB
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 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
Largest Contentful Paint element 1 element found
This is the largest contentful element painted within the viewport
Avoid serving legacy JavaScript to modern browsers Potential savings of 0 KiB
Polyfills and transforms enable legacy browsers to use new JavaScript features. However, many aren't necessary for modern browsers. For your bundled JavaScript, adopt a modern script deployment strategy using module/nomodule feature detection to reduce the amount of code shipped to modern browsers, while retaining support for legacy browsers
Avoids enormous network payloads Total size was 1,013 KiB
Large network payloads cost users real money and are highly correlated with long load times
Serve static assets with an efficient cache policy 16 resources found
A long cache lifetime can speed up repeat visits to your page

Mobile

Mobile Screenshot
First Contentful Paint 3.4 s
First Contentful Paint marks the time at which the first text or image is painted
Total Blocking Time 460 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds
First Meaningful Paint 3.4 s
First Meaningful Paint measures when the primary content of a page is visible
Avoids enormous network payloads Total size was 1,462 KiB
Large network payloads cost users real money and are highly correlated with long load times
Time to Interactive 9.0 s
Time to interactive is the amount of time it takes for the page to become fully interactive
Initial server response time was short Root document took 40 ms
Keep the server response time for the main document short because all other requests depend on it
Serve static assets with an efficient cache policy 17 resources found
A long cache lifetime can speed up repeat visits to your page
Largest Contentful Paint 9.5 s
Largest Contentful Paint marks the time at which the largest text or image is painted
Reduce JavaScript execution time 1.5 s
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this
Avoid non-composited animations 1 animated element found
Animations which are not composited can be janky and increase CLS
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
Max Potential First Input Delay 350 ms
The maximum potential First Input Delay that your users could experience is the duration of the longest task
User Timing marks and measures 1 user timing
Consider instrumenting your app with the User Timing API to measure your app's real-world performance during key user experiences
Serve images in next-gen formats Potential savings of 183 KiB
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
Avoids an excessive DOM size 603 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)
Defer offscreen images Potential savings of 18 KiB
Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive
Eliminate render-blocking resources Potential savings of 2,410 ms
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles
Remove unused CSS Potential savings of 109 KiB
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
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
Minimize main-thread work 3.1 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
Avoid chaining critical requests 5 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
Web app manifest or service worker do not meet the installability requirements 1 reason
Service worker is the technology that enables your app to use many Progressive Web App features, such as offline, add to homescreen, and push notifications. With proper service worker and manifest implementations, browsers can proactively prompt users to add your app to their homescreen, which can lead to higher engagement
First Contentful Paint (3G) 6803 ms
First Contentful Paint 3G marks the time at which the first text or image is painted while on a 3G network
Remove unused JavaScript Potential savings of 221 KiB
Remove unused JavaScript to reduce bytes consumed by network activity
Avoid long main-thread tasks 5 long tasks found
Lists the longest tasks on the main thread, useful for identifying worst contributors to input delay
Tap targets are not sized appropriately 46% 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
Estimated Input Latency 60 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
Keep request counts low and transfer sizes small 39 requests • 1,462 KiB
To set budgets for the quantity and size of page resources, add a budget.json file
Avoid serving legacy JavaScript to modern browsers Potential savings of 0 KiB
Polyfills and transforms enable legacy browsers to use new JavaScript features. However, many aren't necessary for modern browsers. For your bundled JavaScript, adopt a modern script deployment strategy using module/nomodule feature detection to reduce the amount of code shipped to modern browsers, while retaining support for legacy browsers
Speed Index 5.5 s
Speed Index shows how quickly the contents of a page are visibly populated
Document uses legible font sizes 100% 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
Reduce the impact of third-party code Third-party code blocked the main thread for 300 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
First CPU Idle 6.6 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/).
Cumulative Layout Shift 0.002
Cumulative Layout Shift measures the movement of visible elements within the viewport
Largest Contentful Paint element 1 element found
This is the largest contentful element painted within the viewport
Avoid large layout shifts 1 element found
These DOM elements contribute most to the CLS of the page.
Includes front-end JavaScript libraries with known security vulnerabilities 8 vulnerabilities detected
Some third-party scripts may contain known security vulnerabilities that are easily identified and exploited by attackers

Speed And Optimization Tips

Website speed has a huge impact on performance, affecting user experience, conversion rates and even rankings. ‪‬‬By reducing page load-times, users are less likely to get distracted and the search engines are more likely to reward you by ranking you
Title Website
Congratulations! Your title is optimized
Description Website
Warning! Your description is not optimized
Robots.txt
Congratulations! Your site have a robots.txt file
Sitemap.xml
Warning! Not found a sitemap file for your website
SSL Secure
Congratulations! Your site have Support to HTTPS
Headings
Congratulations! You are using your H1 and H2 tags in your site
Blacklist
Congratulations! Your site is not listed in a blacklist
W3C Validator
Warning! Your site have errors W3C
Accelerated Mobile Pages (AMP)
Warning! Your site not have AMP Version
Domain Authority
Congratulations! Your Domain Authority is good
GZIP Compress
Warning! Your site not is compressed, this can make slower response for the visitors
Favicon
Congratulations! Your website appears to have a favicon.
Broken Links
Congratulations! You not have broken links View links
First 20 Links Relationship HTTP Status
one of our supported browsers Internal Link 200
http://code.org Internal Link 301
Learn Internal Link 301
Teach Internal Link 301
Projects Internal Link 301
Stats Internal Link 301
Help Us Internal Link 301
About Internal Link 301
Sprite Lab Internal Link 301
Artist Internal Link 301
App Lab Internal Link 301
Game Lab Internal Link 301
Dance Party Internal Link 301
View all projects... Internal Link 301
Sign in Internal Link 301
Help and support Internal Link 301
Report a problem Internal Link 200
Elementary School Internal Link 301
Middle School Internal Link 301
High School Internal Link 301

Alexa Rank

1,829

Global Rank

843

United States
Traffic
Search

Domain Available

Domain (TDL) and Typo Status
code.co Already Registered
code.us Already Registered
code.com Already Registered
code.org Already Registered
code.net Already Registered
cde.org Already Registered
dode.org Already Registered
rode.org Already Registered

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
Connection: keep-alive
Date: Tue, 02 Mar 2021 16:38:51 GMT
Set-Cookie: AWSALB=a4A8N32AxF3M/2XROKqjUOM82ocgNDz5iainS0XFQG/QMkCK5tVgq2k8yZP4nEpnZcvmxRJRGmGiP38XPq38eTtJNFsyhUIC6qUVh/4HsxJfhm6VIbm8ytAgob4K; Expires=Tue, 09 Mar 2021 16:38:48 GMT; Path=/
Set-Cookie: AWSALBCORS=a4A8N32AxF3M/2XROKqjUOM82ocgNDz5iainS0XFQG/QMkCK5tVgq2k8yZP4nEpnZcvmxRJRGmGiP38XPq38eTtJNFsyhUIC6qUVh/4HsxJfhm6VIbm8ytAgob4K; Expires=Tue, 09 Mar 2021 16:38:48 GMT; Path=/; SameSite=None; Secure
Server: nginx/1.14.0 (Ubuntu)
Cache-Control: public, max-age=14400, s-maxage=7200
Link: ; rel=preload; as=image; media="not all and (-webkit-min-device-pixel-ratio: 2), not all and (min-resolution: 192dpi)";,; rel=preload; as=image; media="(-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi)";
X-XSS-Protection: 1; mode=block
X-Content-Type-Options: nosniff
X-Frame-Options: 
Content-Security-Policy: default-src 'self' https:; frame-src 'self' https: blob:; worker-src 'self' blob: ; child-src blob: ; script-src 'self' https: 'unsafe-inline' https://vaas.acapela-group.com 'unsafe-eval'; style-src 'self' https: 'unsafe-inline'; img-src 'self' https: data: blob:; font-src 'self' https: data:; connect-src 'self' https: https://api.pusherapp.com wss://ws.pusherapp.com wss://*.firebaseio.com http://localhost:8080 https://curriculum.code.org/; media-src 'self' https: http://vaas.acapela-group.com; report-uri //code.org/https/mixed-content; frame-ancestors 'self' http://*.disney.com http://*.diznee.net cuantrix.mx code.org studio.code.org curriculum.code.org codecurricula.com
Content-Encoding: gzip
Content-Language: en
Strict-Transport-Security: max-age=31536000
X-Varnish: 62591664
Via: 1.1 varnish (Varnish/5.2), 1.1 aa041b2846a7af13fb402bb8a3079b43.cloudfront.net (CloudFront)
X-Varnish-Cache: MISS
X-Varnish-Node: ip-10-0-2-22
Accept-Ranges: bytes
Vary: Accept-Encoding,Accept-Language,CloudFront-Viewer-Country,Cookie
X-Cache: Hit from cloudfront
X-Amz-Cf-Pop: ORD53-C3
X-Amz-Cf-Id: CqKwhSyJji0nihmJthp0t97OHfA8e4lYOpIxn_RS_9zuHn_Phz7vBw==
Age: 2158
DNS Records DNS Resource Records associated with a hostname
View DNS Records
Type Name Value Class TTL
A code.org 52.84.55.189 IN 17
NS code.org ns-1497.awsdns-59.org IN 21599
NS code.org ns-1652.awsdns-14.co.uk IN 21599
NS code.org ns-269.awsdns-33.com IN 21599
NS code.org ns-678.awsdns-20.net IN 21599
MX code.org aspmx.l.google.com IN 299
MX code.org aspmx2.googlemail.com IN 299
MX code.org aspmx3.googlemail.com IN 299
MX code.org alt1.aspmx.l.google.com IN 299
MX code.org alt2.aspmx.l.google.com IN 299
TXT code.org MS=ms84680364 IN 299
TXT code.org bugcrowd-verification=4e328e2cf7e9d86a17f10faeceeedd3e IN 299
TXT code.org d1l2ndf1rv58my.cloudfront.net IN 299
TXT code.org facebook-domain-verification=wvqcv3rz5jjrhuaoeyedkmqtyugi7b IN 299
TXT code.org google-site-verification=-E_rSfU2SJ037l6KuAS1LMH7BQ7Lw-Feb1I7JZvVpqI IN 299
TXT code.org google-site-verification=MEP5IUpWIF4sLlOnOyFoy8IB9KA-aZmKBukf30eO4-Y IN 299
TXT code.org google-site-verification=rlD0fAw4zex4U4XrrJn3Zf--QddLebZcb5seIznZ1_4 IN 299
TXT code.org v=spf1 include:amazonses.com include:_spf.google.com include:mail.zendesk.com include:servers.mcsv.net include:aspmx.pardot.com ~all IN 299

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