非ひ公こう式しきアプリ

noun

unofficial app; non-store app

Refers to a smartphone app distributed outside official app stores like Google Play or the Apple App Store, often via direct download or third-party platforms.

• 非ひ公こう式しきアプリをインストールするときは、セキュリティに注ちゅう意いが必ひつ要ようです。

  When installing an unofficial app, you need to be careful about security.