A habit tracker is a grid of small boxes and a slightly irrational unwillingness to break a run of filled ones. That is the whole mechanism, and it is why the format has survived every productivity fashion of the last decade. These are blank sheets rather than a system: write your own habits down the side, fill a box each day you do one, and keep the page somewhere you will actually see it. Fewer habits tracked properly beats a full page tracked for nine days.
Monthly habit grids with a blank habit column and 31 day columns, weekly layouts for a shorter commitment, and a single-habit sheet with larger boxes for one thing you are serious about. Boxes are sized for a check, a cross or a color fill. Printed black on white, one tracker per US Letter page.
Most people who stick with it track three to five. A page with twelve rows looks impressive on day one and turns into an accusation by day ten. If you want to add a habit, the usual advice is to wait until an existing one no longer needs tracking.
What happens when I miss a day?
Leave the box empty and fill the next one. The gap is information, not a verdict, and the common failure mode is abandoning the whole page after a single miss. Some people mark missed days with a dot rather than nothing, so that a deliberate skip looks different from a forgotten one.
Monthly grid or weekly layout?
A monthly grid shows patterns — that the gaps cluster at weekends, for instance — which is the most useful thing a tracker tells you. Weekly layouts have bigger boxes and less commitment, so they suit a new habit or anyone who finds a 31-column grid daunting.
Do these have dates printed on them?
No, they are undated with blank day columns, so you can start on any day of any month and print the same sheet again next month. That also means one file stays useful indefinitely rather than expiring at the end of a year.