What does アプリ mean?
アプリ is a Japanese noun meaning “app, application” in English. It is written as アプリ in katakana, and apuri in romaji. This word is part of JLPT N3 vocabulary.
Example sentence
iPadアプリを作るのがこんなに大変だとは思ってもみなかった。
I never thought it'd be this hard to create an iPad app.