貼るカウントダウン - カレンダー連動の予定表示ウィジェット is a productivity app by tsubushiro.work with 1+ downloads (about 4 estimated). +2 installs in the last 7 days. Install growth, rank history, SDKs and ad networks.
From the store listing: “A widget app that displays a countdown timer on your home screen, integrating with your calendar to show the remaining time until an appointment. It also automatically tracks rescheduling. Unnecessary appointments can be filtered out.”