App Tube

App Tube (アプチューブ, Apu Chūbu) is a video-sharing website operated by L Corp that appears in Digimon Universe Appli Monsters. Users who upload videos to the service are known as "App Tubers" (アプチューバー, Apu Chūbā). Asuka Torajirou is a popular App Tuber who uploads videos under the name "Astra", formed by combining parts of his surname and given name.
List of known App Tubers
Appearances
Anime
Digimon Universe Appli Monsters
Asuka Torajirou becomes interested in making videos after watching an amusing upload on App Tube. With his father's permission, he begins posting comedic videos as Astra and develops a following, including enthusiastic fans among his classmates.
Shinkai Haru and Gatchmon discover that Astra is an Appli Driver after noticing his Appli Drive in one of his videos, leading them to seek him out.
During Astra's competition with another App Tuber, Recomon helps him with his videos. An L-Virus-infected Dogamon begins ruining videos, prompting Musimon and Recomon to undergo AppGattai into Mediamon and defeat him.
Manga
Digimon Universe Appli Monsters
Asuka Torajirou uploads videos to AppTube under the name "Astra" and has gained recognition as an AppTuber.
Video Games
Digimon Universe Appli Monsters
Asuka Torajirou, known online as "Astra", is an AppTuber who frequently searches for material for his videos, even while investigating the Seven Code Appmon with Musimon.
During the subquest "Feeling It or Not? Investigation", Kazuki/Itsuki uses AppTube to track Astra's movements after he leaves without exchanging contact information. His latest upload allows them to identify his location, and a subsequent video leads them to Greenery Park. Astra also attempts to cheer up a crying child by showing him one of his videos, although this proves unsuccessful.
After investigating incidents involving Savemon and Onpamon, Astra proposes filming a battle against Kazuki/Itsuki for his channel. MCmon, who identifies himself as an Astra fan, activates the Remote Cyber Arena for their match. Despite losing, Astra is pleased to have obtained footage and intends to upload it immediately. However, MCmon explains that Appli Driver battle videos are prohibited on AppTube and that only Appli Drivers would be able to see them anyway. The battle is instead streamed by MCmon, while Astra decides to return home to film himself eating macadamia nuts with his nose.