A smart-device usage guidance app for children that represents screen-time allowances as plums — one plum equals 10 minutes. Children select plums to "use" them, and each plum transitions from whole → bitten → seed over the session duration.
After installation, the caregiver and child enter agreed weekly/daily usage time limits. The app generates numbered icons representing available usage days across a 2-week period.
Selecting a day opens a screen with plums matching that day's target allowance. The current day shows as "이번 사용" (Current Use) and the following day as "다음 사용" (Next Use). The child taps the desired number of plums and presses "사용" (Use) — selected plums change from whole to bitten, then turn into seeds after 10 minutes each. A completion notification appears when the session ends.
Arrow controls let children move plums between "Current Use" and "Next Use," borrowing time from the next day within the same two-day window. Total plum count stays constant; only allocation shifts. Movement is restricted to the two-day window to keep the concept understandable for younger children.
Same as the flexible version but without the arrow mechanism — children can only consume plums assigned to the current day.
