cs50.io


Tags Whois Backlink & Rankings Speed Safety Headers Similar Sites Keywords H Tags
Tags Whois Rank Speed Safety Headers Similar Sites Keywords H Tags

cs50.io Website Info

cs50.io (CS50.io is the online platform offering Harvard's famous CS50 course, designed to teach foundational computer science concepts, programming languages, and problem-solving skills through engaging lectures, problem sets, and projects suitable for learners at all levels.) was registered first at 2011-09-07 06:56:11. DNS looks Active and website looks Accessable. Domain Moz Rank is 4.2 and SEMRush Rank is 425,313. According to Google, website speed score is 61/100 and AVERAGE. Website looks safe for children. We detected the website language as en.
cs50.io


cs50.io Website Tags

Domain Status:
✓ Active
Is Site Accessable?:
✓ Yes
SSL(https):
✓ Yes
Accessable Url:
https://www.cs50.io
Title:
CS50.io - Harvard's Introduction to Computer Science
Description:
Join CS50.io for Harvard's renowned Introduction to Computer Science course online. Learn programming, problem-solving, and software development skills with comprehensive resources and assessments.
Categories :
Internet Services, Information Technology
External Links:
5
Internal Links:
4
Mobile Friendly?:
✓ Yes
Canonical URL:
[Not Set]
Language:
en
XML Sitemap:
✗ No
robots.txt:
✗ No
Favicon:
✓ Yes

cs50.io Domain & Whois Details

Refresh
Domain Create Date:
2011-09-07 06:56:11
Domain Age:
13 years, 9 months, 26 days
Domain Expire Date:
2023-09-07T06:56:11Z
Domain Last Update Date:
2023-09-07T06:56:11Z
Domain Owner:
http://key-systems.net - Key-Systems GmbH - Registrant REDACTED FOR PRIVACY - Admin REDACTED FOR PRIVACY - Tech REDACTED FOR PRIVACY -
Server Type:
nginx/1.22.1
Nameservers:
ns-1160.awsdns-17.org - ns-1873.awsdns-42.co.uk - ns-241.awsdns-30.com - ns-517.awsdns-00.net -
Hosting Location:
Country:United States, City:Seattle, Isp:Amazon.com, Inc., Org:AWS Global Accelerator (GLOBAL)
IP:
75.2.60.5

cs50.io Backlinks & Rankings

Moz Rank:
4.2
MozRank is developed by SEOmoz similar to Google Pagerank and scaled 10-point measurement.
Moz DA:
34
Moz Domain Authority (DA) is a search engine ranking score developed by Moz that predicts how well a website will rank on search engine result pages. Domain Authority scores range from one to 100, with higher scores corresponding to greater likelihood of ranking.
Moz PA:
42
Moz Page Authority (PA) is Page Authority (PA) is a score developed by Moz that predicts how well a specific page will rank on search engine result pages (SERP). Page Authority scores range from one to 100, with higher scores corresponding to a greater ability to rank.
MOZ Total Links:
1,140
Number of total links (equity or nonequity or not, internal or external) to the URL.
MOZ External Links:
767
Number of external equity links to the URL.
SEMRush Rank:
425,313
Semrush Rank is a proprietary score that lets you find the domains that are getting the most traffic from organic search.
SEMRush Traffic:
3,230
Number of users expected to visit the website during the following month.
SEMRush Costs:
885
Estimated price of organic keywords in Google AdWords.
SEMRush URL Links:
1,398
Number of links to URL according to SemRush.
SEMRush Website Links:
2,076
Number of links to the website according to SemRush.
SEMRush Domain Links:
33,120
Number of links to SemRush Domain.
SEMRush Keywords In Top 100:
3,284
Number of keywords where site in Google's organic search top 100.

cs50.io Social Media

Facebook Comments:
62
Facebook Shares:
56
Facebook Reactions:
357

cs50.io Website Speed (Desktop)

Refresh
Overall Category:
AVERAGE
The human readable speed "category"
Speed Index:
61
Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric].
Cumulative Layout Shift (CLS):
0.01 (FAST)
The Cumulative Layout Shift (CLS) metric measures how much unexpected layout shifts affect the user experience on a page. These layout shifts occur when content moves around without prior user input. CLS
Time to First Byte (TTFB):
1.398 s (AVERAGE)
TTFB (time to first byte) is the number of milliseconds it takes for a client’s browser to receive the first byte of the response from the web server. Usually, TTFB can be improved with faster hosting and server optimizations. TTFB
First Input Delay (FID):
2 ms (FAST)
First Input Delay (FID) measures the time from when the user interacts with your site for the first time (click a link, tap on a button, etc.) to the time when the browser is able to respond to that interaction. Google recommends keeping FID below 100ms for a good user experience. FID
First Contentful Paint (FCP):
2.298 s (AVERAGE)
FCP (First Contentful Paint) measures the time from a user’s navigation to when the browser renders the first bit of content from the DOM. In other words, FCP marks the time at which the first text or image is painted for the user. According to PageSpeed Insights, FCP should occur in under 2 seconds. FCP
Interaction to Next Paint (INP):
46 ms (FAST)
Interaction to Next Paint (INP) is a web performance metric that measures user interface responsiveness – how quickly a website responds to user interactions like clicks or key presses. Specifically, it measures how much time elapses between a user interaction like a click or key press and the next time the user sees a visual update on the page. INP
Largest Contentful Paint (LCP):
2.641 s (AVERAGE)
Largest Contentful Paint (LCP) is a metric that measures when the largest content in the viewport is rendered. It is used to measure how long it takes for the main content of your webpage to appear on the screen. Everything below 2.5s is considered good LCP time by PageSpeed Insights. LCP
Total Size:
943 KB
Total Size. Large network payloads cost users real money and are highly correlated with long load times.
Server Response Time:
113 ms
Initial server response time. Keep the server response time for the main document short because all other requests depend on it. [Learn more about the Time to First Byte metric](https://developer.chrome.com/docs/lighthouse/performance/time-to-first-byte/).
Final Url:
https://cs50.dev/
Canonicalized and final URL for the document, after following page redirects (if any).
Last Date Checked:
5/26/2023 9:36:33 PM
The last time we checked this website.
Site Speed Check(Full)

cs50.io HTML Resources

Type
Request Count
Size
Total
16
943 KB
Third-party
13
881 KB
Script
7
710 KB
Font
1
106 KB
Stylesheet
2
59 KB
Image
2
56 KB
Document
2
9 KB
Other
2
1 KB
Media
0
0 KB

cs50.io Website Safety

Refresh
Last Check Date:
6/13/2023 5:40:05 AM
Fortiguard:
Information Technology
Mcafee Category:
Internet Services
OpenDNS:
BeFirst
Cloudflare DNS:
OK
MyWot Child Safety:
99

cs50.io HTTP Headers

Refresh
Cache-Control :
no-cache, no-store, must-revalidate
Connection :
keep-alive
Content-Length :
14378
Content-Security-Policy :
frame-ancestors 'self'
Content-Type :
text/html; charset=utf-8
Date :
Sat, 13 May 2023 15:45:19 GMT
expires :
0
Pragma :
no-cache
Server :
nginx/1.22.1
Set-Cookie :
AWSALB=HB6apKAAWKXsJHb/POVTHc0ZAQ7wafJSueEbHE0kB9s
Status :
200 OK
strict-transport-security :
max-age=60


cs50.io W3C HTML Validation Check Now

Last Check Date:
5/27/2023 12:00:00 AM
Errors:
1
Warnings:
0
Info:
0
Check Live:
Check cs50.io HTML Errors

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cs50.io Site Keywords

coding
Computer Science
CS50
harvard
online course
programming
programming tutorials
software development

cs50.io Site H Tags

Check Now
h1
Visual Studio CodeVS Code for CS50

cs50.io Sites with Same Names

Website
Title
Rank
cs50.org cs50.org
CS50 - Harvard University's Introduction to Computer Science
8,398,314
cs50.net cs50.net
CS50: Computer Science Courses and Programs from Harvard | edX
839,440
cs50.me cs50.me
CS50: Introduction to Computer Science - Harvard University
7,673,256
cs50.readthedocs.io cs50.readthedocs.io
CS50 Read the Docs - Comprehensive Documentation for CS50 Courses
517,506
cs50.ly cs50.ly
CS50: Computer Science Courses and Programs from Harvard | edX
45,518,944
cs50.github.io cs50.github.io
CS50 Harvard's Introduction to Computer Science
14,853,727
cs50.com.ua cs50.com.ua
cs50 Веб решения и частная веб разработка - cs50 веб решения
13,354,111
cs50.jp cs50.jp
CS50 for Japanese: コンピュータサイエンスの入門 - 当ウェブサイトは、Creative Commons ライセンスに基づいて管理されています。
11,456,151
cs50.xyz cs50.xyz
cs50.wiki cs50.wiki
CS50 AP
cs50.school cs50.school
cs50.tv cs50.tv
CS50: Computer Science Courses and Programs from Harvard | edX

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