Do I need a computer or desktop app to edit or create decks?

No, decks can be created and edited within AnkiApp directly on your mobile device—no computer or desktop app required.

However, you may find it more efficient to create and edit flashcards on a desktop computer. The AnkiApp web client is available at: https://web.ankiapp.com. AnkiApp is also available as a native app on Windows and macOS. See https://www.ankiapp.com for download links. The web/desktop apps work seamlessly with AnkiApp on mobile devices.