價格：免費
檔案大小：28.5 MB
版本需求：系統需求：iOS 9.0 或以後版本。相容裝置：iPhone、iPad、iPod touch。
支援語言：英語
Green Fee, developed by Susan Elswick, a professor in the social work department at the U of M, is a game-based app that allows users to track their green-living efforts, as well as green-living issues they encounter.
支援平台：iPhone, iPad