.STDL File Extension
File TypeSwift To-Do List Database
This file is saved in a binary format, which requires a specific program to read its contents.
What is an STDL file?
Data file created by Swift To-Do List, a personal organization software used for recording to-do lists; saves a backup of the to-do database, and includes one or more to-do lists which can include one or more tasks; stores the description, priority, type, and due date for each task.