According to the interview on the September issue of Animedia. Appmon is trying to "take off from the original digimon". Meaning, many seasons of Digimon from the past are sharing similar concepts as the first season: Digimon adventure. In Digimon Universe Applimonster, since they are taking place in a more modern world, with popular daily use of smart phone apps as concept, they are trying to create this series base of that, and not follow what "Digimon series usually do". Such as Haru is opposite of Taichi, he's not hot headed or active in sport. Instead he likes to read with good grades, and search for solutions during battles. Each appmon are "buddy up" (they are not using the term "partner digimon") depends on each characters' favorite app. Haru loves to search for solutions therefore Gatchamon is an appmon come from a search app. And Torajiro uses music app often, therefore he's buddy up with musicmon.
Just like xros wars, the level system are naming differently from previous generation of digimon series.