Left: water 氵, right: to climb 登 (The volcano 癶 spits bean 豆, let's climb up)
Mnemonic
(In dirty water, the dirt settles down & a clean fraction rises up:) When water is climbing, it becomes clear. (Beforehand, in the water 氵 the view 罒 of insects 虫 was only indistinct, as if wrapped up 勹, due to the impurity 濁)
The app has many other functions, such as character selection according to difficulty, practice programs, handwriting recognition and success statistics!