Prezident 21 is an interactive website, created by the Czech mathematician and political activist Karel Janeček and his think tank, Institute H21, used to familiarise voters with a proposed system to select a presidential candidate for the 2018 Czech presidential election.
[2] Participants were allowed to nominate anyone except for the software creator, Janeček.
Over 3,000 people participated in the first few hours of the website's creation, after which Šimon Pánek was in first place.
[3] Zeman's poor result was said to be most likely due to the fact that his supporters were less active on the Internet.
[4] By April 2017, Michal Horáček had taken the lead, and was then overtaken by Jiří Drahoš.