Many people try dozens of complicated todo apps, only to go right back to their todo.txt file.
But it's not easy to open todo.txt, make a change, and save it—especially on smart phones and at the command line. Todo.txt solves that problem.
Todo.txt uses a simple set of rules that make Todo.txt both human and machine-readable. The format supports priorities, creation and completion dates, tags and contexts.
Tags and contexts can be added to your todos with '+' and '@' like this
Do dishes +chores @home
Prioritize todos with '(letters)'
(A) Do dishes +chores @home
(B) Do dishes +chores @home
Complete a todo with an 'x'
x Do dishes +chores @home
That's it. You're not going to find checkboxes, drop-downs, reminders, or date pickers. Simply a text file.