Regarding the calendar reminder software suitable for Android phones, you can find many reminders in the mobile phone application market, which can prompt whether the schedule is completed. You can try to use the symbol of dedication.

When using the engagement sign on Android phone, there will be a red dot in front of the schedule reminder for all reminders that are not marked due;

Mark the completed to-do list and present it in the form of deletion line on the dedication sign;

At the same time, you can also check when and what tasks have been completed through the completed list, so that you can see at a glance what you have done.