"Знаешь" is a free Android application developed by vodnouho that provides users with access to tens of thousands of facts and interesting notes from Wikipedia. The app uses only up-to-date information, which is regularly added by Wikipedia users. It also features illustrations that are loaded from all related articles, making reading more fun than on the actual Wikipedia site.

One of the app's most useful features is the brief summary that pops up when a term mentioned in a note is clicked. Additionally, the app provides links to the articles for users who want to learn more. Sharing is also made easy with the app, as users can send the most interesting notes to their friends via messenger or publish them on their social media pages.

It is worth noting that the app uses materials from the free encyclopedia, wikipedia.org, and its content is available under the CC BY-SA 3.0 license. Overall, "Знаешь" is a great app for anyone looking for a comprehensive Wikipedia reader that is both informative and easy to use.