现有定时提醒应用无法设置固定间隔（如每2小时）的重复提醒，需要手动输入每个具体时间点，操作繁琐。
需要定时提醒的移动设备用户
Freemium model: basic features are free, while advanced features (such as custom intervals and multiple reminders) require payment to unlock, or a one-time purchase of $2.99-4.99.
System built-in alarms, Pomodoro-style apps (such as Forest, Focus Keeper), etc., but users have explicitly stated that these do not meet their need for simple interval reminders.
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