Detel

Detel is probably best described as a combination of a task-list and/or a reminder.
Yet in fact it is neither.
Everyone has tasks that are best when complete. Some keep them in calendars and create reminders for events to ensure their completion.
But some events are a bit tricky when it comes to using reminders, as they don't have a specific time or even date.
Detel is designed to handle such events and will make you enter an interval of days in which your event is relevant instead of entering date and time. It will then gently remind you about your tasks.
There will be no alerts, no sounds, no vibrations, no banners – no indications at all of an upcoming event.
There will only be a badge on your application icon telling you it needs attention.