Focalist is fast, free and cross-platform todo app.
Focalist doesn't slow you down in a separate add or edit screen: managing your list is like editing a document. You can still schedule, set reminders and categorize a task instantly from the quick actions popup.
You shouldn't have to dig around for the next task. The Now view shows you only tasks you can accomplish right now. You can set tasks to show up later, on a particular device, or at a location like a grocery store. You can surface projects by having the top task show up there.
Have your phone pop up a notification when you arrive at any grocery store, telling you to buy bananas. Or at any hardware store, telling you to buy a new drill bit.
Sometimes you really need the space of a larger screen. Tell your task to show only on your laptop.
Coming soon: Get a notification to take the patio cushions in if it's going to rain, or to do gardening if it's sunny.
Break down your tasks into smaller steps, and break those down into even smaller steps. Collapse them when you don't need to see the details. Your lists themselves can also be nested and collapsed to as many levels as you like.
Instantly syncs to all your devices to the cloud. Also syncs notification dismissals, so you never have to deal with duplicate notifications.