A month on one grid — tick the days, watch the streaks, take it away as a picture or a spreadsheet
A habit grid works for a reason that has little to do with willpower. Marking a day turns an intention into a record, and a record is something a person can be honest with in a way they cannot be with a vague sense of how the month has gone. The rows are deliberately unforgiving: a blank square is not an accusation, but it is not nothing either, and the pattern that builds across four weeks says more than any single day ever could.
The streak is the part that does the work, and also the part that misleads. Watching a run of days grow is a genuine motivator — the reluctance to break a long chain is well documented, and it is the mechanism behind everything from language apps to the calendar Jerry Seinfeld is said to have used. But a streak also makes a single missed day feel like a failure of the whole enterprise, which is precisely backwards. Someone who manages a habit on five days out of seven for a year has done it two hundred and sixty times; someone who abandons it after breaking a twelve-day run has done it twelve. That is why the grid here keeps both the current run and the best one, and counts the total separately.
What to track is worth some thought. Habits that are specific and finishable — thirty minutes of reading, one walk, no alcohol today — mark cleanly and honestly. Vague ones such as "be productive" cannot be marked without lying to yourself, and a tracker full of half-truths is worse than none. Fewer rows also beat more: three or four habits attended to properly will outrun a dozen tracked carelessly, and the ones that stick tend to be those attached to something already happening at a fixed time of day.