Simply Piano ピアノ練習 - 独学で楽しく上達

Why this icon holds up

On 2026-08-11 the vault captured the Simply Piano ピアノ練習 - 独学で楽しく上達 icon (Education, US): 紫色背景，中间是一个白色的迷你键盘，左上角有一个闪光符号。

No earlier vault capture exists yet, so this dated page is the baseline for future diffs.

Tagged as illustration · playful.

Small-size readability

• Contrast: white mark on purple fill — check both dim OLED and bright LCD.
• Silhouette budget: keyboard, keys, sparkle should remain readable after the store’s rounded-square crop.
• illustration detail collapses quickly below ~60px — verify the 60px mental model before trusting the master.
• Internal usability score for this capture: 0.6/100 (heuristic, not a store ranking).

These checks are practical references for designers reviewing Simply Piano ピアノ練習 - 独学で楽しく上達, not authoritative store scores.

Transferable design moves

• Keep keyboard as the primary silhouette before adding secondary ornaments.
• Concentrate the loudest chroma on the identifying shape (white), not the whole purple field.
• This capture’s illustration vocabulary transfers best when the same restraint is applied at export size.