About ck12.org

Is a reliable website. We determined the efficiency score of the site as %56.
Site Title Free Online Textbooks, Flashcards, Adaptive Practice, Real World Examples, Simulations | CK-12 Found and dmoz title is Ck12.org.
The website's html version is html3, IP Address is and Alexa Rank is 129789
Is the most visited of the United States.
Site Categories : k-12 education, flexbook, oer, curriculum, digital textbooks, ebooks, lesson plan, worksheet, textbook, study guides

Technologies for ck12.org


RATE (Update Weekly)

% 56

HTML size of ck12.org


HTML and text sizes are used in the main page of www.ck12.org like the graph.

- HTML size is 66KB, compressed HTML and Text Size are 53KB and 19KB.

- There is up to 0 percent of the difference between the size of HTML and the compressed HTML size. If you can compress your HTML, you can have a smaller size site.

Security Information

Google Safe Browsing: No Risk
Siteadvisor Rating: Good
WOT Trustworthiness: Excelent
WOT Privacy: none
WOT Child Safety: none

Used Some Html Tags

HTML tags used in the main page of www.ck12.org like the graph

Html Tag % Used
  head 1%1
  img 5%18
  body 1%1
  iframe 1%1
  div 23%84
  a 29%107
  nav 1%2
  br 1%1
  ul 4%13
  li 5%16
  span 31%113
  i 2%5
  section 2%4
  h3 1%3
  h4 1%1

Dmoz Information

Title : Ck12.org

Description : CK12, a non-profit organization launched in 2006, aims to reduce the cost of textbook materials for the K-12 market both in the US and worldwide. Using an open-source, collaborative, and web-based compilation model that can be manifested as an adaptive textbook - termed the "FlexBook", CK12 intends to pioneer the generation and distribution of high quality educational web texts. ...

Categories :

Visited by Browsers

Most using browsers visited this website

Browser % Using
   Chrome 62% 43
   Internet Explorer 12% 8
   Firefox 19% 13
   Safari 6% 4
   Opera 3% 2