Only the current version so far — new entries appear as the app ships updates.
麻雀符計算 is a tools app by 曽和高志 with 10,000+ downloads (about 36K estimated). +15 installs in the last 7 days. Released Sep 4, 2014. Install growth, rank history, SDKs and ad networks.
From the store listing: “This is an app specializing in mark calculations for people who can play mahjong but are not good at counting numbers.
We aimed for an ultra-simple operation and an easy-to-read and easy-to-understand screen.”