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Top Technologies

Nginx
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Web Frameworks

56 code.org Last Updated: 10 months

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

Desktop

Mobile

Performance Desktop Score 98%
Best Practices Desktop Score 85%
SEO Desktop Score 80%
Progressive Web App Desktop Score 58%
Performance Mobile Score 64%
Best Practices Mobile Score 85%
SEO Mobile Score 79%
Progressive Web App Mobile Score 59%
Page Authority Authority 69%
Domain Authority Domain Authority 84%
Moz Rank 6.9/10
Bounce Rate Rate 0%
Charset Encoding
Great, language/character encoding is specified: UTF-8
Title Tag 52 Characters
LEARN COMPUTER SCIENCE. CHANGE THE WORLD. | CODE.ORG
Meta Description 0 Characters
NO DATA
Effective URL 16 Characters
https://code.org
Excerpt Page content
Learn computer science. Change the world. | 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 bro...
Keywords Cloud Density
code22 school8 hour7 norsk6 português6 support6 español6 about6 projects5 foundation4
Keyword Consistency Keyword density is one of the main terms in SEO
Keyword Freq Title Desc Domain H1 H2
code 22
school 8
hour 7
norsk 6
português 6
support 6
español 6
about 6
projects 5
foundation 4
Google Preview Your look like this in google search result
LEARN COMPUTER SCIENCE. CHANGE THE WORLD. | CODE.ORG
https://code.org
Learn computer science. Change the world. | 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 bro...
Robots.txt File Detected
Sitemap.xml File No Found
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 / 1 year
Create on: 1999-09-28 / 21 years
Expires on: 2022-09-28 / 24 months 11 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: ~131.67 KB
Code Size: ~43.71 KB
Text Size: ~87.96 KB Ratio: 66.80%

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
First Meaningful Paint 0.8 s
First Meaningful Paint measures when the primary content of a page is visible
Keep request counts low and transfer sizes small 40 requests • 949 KB
To set budgets for the quantity and size of page resources, add a budget.json file
Serve static assets with an efficient cache policy 5 resources found
A long cache lifetime can speed up repeat visits to your page
Max Potential First Input Delay 110 ms
The maximum potential First Input Delay that your users could experience is the duration, in milliseconds, of the longest task
Time to Interactive 1.0 s
Time to interactive is the amount of time it takes for the page to become fully interactive
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
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
Remove unused CSS Potential savings of 109 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 21 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
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
Server response times are low (TTFB) Root document took 60 ms
Time To First Byte identifies the time at which your server sends a response
Eliminate render-blocking resources Potential savings of 470 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 30 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 30 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds.
JavaScript execution time 0.2 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
Properly size images Potential savings of 12 KB
Serve images that are appropriately-sized to save cellular data and improve load time
Speed Index 1.0 s
Speed Index shows how quickly the contents of a page are visibly populated
First CPU Idle 1.0 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 914 KB
Large network payloads cost users real money and are highly correlated with long load times
Minimizes main-thread work 0.6 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
First Contentful Paint 0.8 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 2 vulnerabilities detected
Some third-party scripts may contain known security vulnerabilities that are easily identified and exploited by attackers
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
Avoids an excessive DOM size 594 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)

Mobile

Mobile Screenshot
Reduce JavaScript execution time 1.3 s
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this
Defer offscreen images Potential savings of 40 KB
Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive
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
Speed Index 3.9 s
Speed Index shows how quickly the contents of a page are visibly populated
First CPU Idle 5.8 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 976 KB
Large network payloads cost users real money and are highly correlated with long load times
Minimize main-thread work 2.4 s
Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this
First Contentful Paint 3.5 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 2 vulnerabilities detected
Some third-party scripts may contain known security vulnerabilities that are easily identified and exploited by attackers
Avoid chaining critical requests 7 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 594 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 3.5 s
First Meaningful Paint measures when the primary content of a page is visible
Keep request counts low and transfer sizes small 40 requests • 1,011 KB
To set budgets for the quantity and size of page resources, add a budget.json file
Serve static assets with an efficient cache policy 5 resources found
A long cache lifetime can speed up repeat visits to your page
Max Potential First Input Delay 490 ms
The maximum potential First Input Delay that your users could experience is the duration, in milliseconds, of the longest task
Time to Interactive 7.1 s
Time to interactive is the amount of time it takes for the page to become fully interactive
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
Estimated Input Latency 90 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) 6476 ms
First Contentful Paint 3G marks the time at which the first text or image is painted while on a 3G network
Tap targets are not sized appropriately 48% 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 97.17% 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 109 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 67 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
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
Server response times are low (TTFB) Root document took 40 ms
Time To First Byte identifies the time at which your server sends a response
Eliminate render-blocking resources Potential savings of 2,550 ms
Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles
Reduce the impact of third-party code Third-party code blocked the main thread for 370 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 320 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds.

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
Connection: keep-alive
Accept-Ranges: bytes
Cache-Control: public, max-age=14400, s-maxage=7200
Cache-Control: no-cache="set-cookie"
Content-Encoding: gzip
Content-Language: en
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; 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 code.org studio.code.org
Date: Tue, 26 Nov 2019 19:53:09 GMT
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)";
Server: nginx/1.14.0 (Ubuntu)
Strict-Transport-Security: max-age=31536000
Via: 1.1 varnish (Varnish/5.2), 1.1 1653617c8dfc2e48beca446a9a4426a1.cloudfront.net (CloudFront)
X-Content-Type-Options: nosniff
X-Frame-Options:
X-Varnish: 70990910
X-Varnish-Cache: MISS
X-Varnish-Node: ip-10-0-0-38
X-XSS-Protection: 1; mode=block
Vary: Accept-Encoding,Accept-Language,CloudFront-Viewer-Country,Cookie
X-Cache: Hit from cloudfront
X-Amz-Cf-Pop: ORD52-C2
X-Amz-Cf-Id: Q-TTA7fEnBddGre2ydY6eEnTZdZAgio67kYRUPy2aj0PkmW2rwotdQ==
Age: 1197
DNS Records DNS Resource Records associated with a hostname
View DNS Records

Comments

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