Kapita, a 6-foot-8 forward out of Huntington Prep (W.Va.), is ranked No. 40 in the ESPN 100. He was one of the top prospects still remaining in the 2015 class.
"He chose them because of their style of play and he hit it off with some of the players currently on the team," Huntington coach Arkell Bruce said.
Missouri, Memphis and West Virginia were among the other schools that had been involved with Kapita in recent months.
The Congo native solidified himself as a top-50 prospect with a strong performance at the LeBron James Skills Academy in July. Kapita has a high motor and a very strong upper body that enables him to finish around the rim and make an impact on the glass.
He's missed most of his senior season with a hip injury.
Kapita joins an Arkansas recruiting class that includes another ESPN 100 prospect, point guard Jimmy Whitt (No. 72).