Slate

I don't think most people need another calendar. I also don't think most people need another infinite to-do list.

A calendar has one job: time. It's great at fixed commitments: the flight, the call at 14:00, the dentist. It's much worse at holding ordinary work. Put "write proposal" on Tuesday from 9 to 10:30, and the calendar believes you. It draws a rectangle. Then Tuesday arrives, the call before it runs over, and the rectangle stops describing the day. The work didn't change. The drawing did.

A to-do list has the opposite problem. It accepts almost anything, which is great for capture, but it never decides what deserves this week. So people add dates to force some order, except most of those dates aren't deadlines, they're guesses wearing formal clothes. "Wednesday" usually just meant I hope the week has room for this by then. The app treats that hope like a promise, and when Wednesday arrives and the task isn't done, it calls it overdue. That word is too heavy for what actually happened: you guessed wrong about your own week, which is one of the most ordinary things a person can do.

Slate takes a simpler position: if a task belongs on Wednesday, put it on Wednesday, not as a fake deadline, not as a time block, just as a placement. The week is laid out as days, and moving a task when Wednesday changes isn't task hygiene, it's planning. Work that isn't ready yet, the fuzzy, half-formed stuff, waits in an Idea Backlog instead of cluttering a day it doesn't belong to yet.

Scheduling is what you do when the constraints are known. Planning is what you do while they're still arriving. Slate is built for the second one: a workbench for the week, not a calendar and not a list.