Steemit is described as 'A non-censored social platform where users are incentivized to contribute and curate content. The users decide what is valuable by voting, and content regarded valuable is rewarded with money' and is a very popular Social Network in the social & communications category. There are more than 100 alternatives to Steemit, not only websites but also apps for a variety of platforms, including Android, iPhone, Self-Hosted and iPad apps. The best Steemit alternative is Lemmy, which is both free and Open Source. Other great sites and apps similar to Steemit are Reddit, diaspora*, Medium and Gab.
Steemit is modelled on reddit, and the features are pretty much the same. The main differences are that Reddit is used by more people, and that Steemit has a cryptocurrency instead of karma points.