The week is the unit, not the day
Most planner apps default to a daily list because it's simpler to ship. Weekly planning is harder to build, easier to live with.
The first thing every productivity coach tells you is to plan in time horizons larger than a single day. "Today" is a vanishing object. It shrinks every hour. By 11am you've already lost half of it. By the time you actually sit down to plan, the planning itself feels like one more thing on the list.
The week is more honest. Seven days is enough for the natural rhythms of life (recurring meetings, the cadence of the gym, the rotating dinners with friends) to show up in front of you, but short enough that you can hold the whole thing in your head.
Most task apps treat "this week" as a derived view: a filter on top of a daily list. That sounds the same and isn't. When the week is a derived view, you plan a day at a time and hope it adds up. When the week is the primary view, you plan the week first and let the days fall out of it.
weekkii starts with seven columns. One for each day of your week, side by side, on one screen. Below the columns sits a single inbox for everything that doesn't have a day yet. You drop a task on a day, or you leave it for later. That's the whole interface.
There are no projects, no priorities, no nested folders. Why not? Because we found that adding any of them turned weekkii into a smaller version of Todoist, and Todoist is already the best Todoist. Constraint is the moat. The week-first layout is hard to add to a product whose architecture grew up around lists. We can ship it because it's the only thing we ship.
There's also a small bet underneath this: that fewer features mean less to maintain, less to teach, less to forget. We'd rather build the planner that fits in one screen and one head than the planner that fits in fifty integrations and an admin panel.