Left: earth 土, right: stingy 啬 (He who constantly turns his gold 金 around 回 is stingy.) - Here: a variant of squeeze 夹 [squeeze 夹 = The husband 夫 is squeezed between two persons 丷 (=2x 人 ), cf. 薔]
The app has many other functions, such as character selection according to difficulty, practice programs, handwriting recognition and success statistics!