How they compare
Hentai Heroes and Pornstar Harem are the same kind of game: free-to-play browser games where you collect characters for your harem, and progress nudges you towards paid boosts.
Hentai Heroes, from Kinkoid since 2016, has the more developed comedic story and hentai-style heroines. Pornstar Harem is simpler collection gameplay (you need 15 characters to move on), with clubs that let you team up and chat with other players.
Hentai Heroes is the better game for most players; Pornstar Harem suits people who want the social side.