The 妖怪ウォッチ4　アーク連動アプリ is an official companion app designed to interact with the PlayStation®4 game, 妖怪ウォッチ4++. With this app, players can sync their toys and accessories to unlock items and rewards within the game.

Using the app, players can scan Yokai Arks, Yokai Sacred Swords, and Yokai Y-Medals to acquire various in-game items. It requires a PlayStation™Network account (free registration) and both the PlayStation®4 and the mobile device need to be connected to the same network (home Wi-Fi). Additionally, the mobile device must have NFC reading capabilities, and the app is compatible with iOS 13.0 and above.

For any inquiries regarding the app, players are advised to contact the support team through the designated in-game support channel in 妖怪ウォッチ4++.