Do a 10-minute house reset meeting and frame it as removing the need for reminders: "I don't want to be anyone's parent, so let's make this automatic." Try: "Can we agree on clear 'done by' times and a board that tracks itself? If we miss, there's a simple make-up so it's fair and not personal." Then set standards in one sentence per task so no one argues later: dishes = all dishes washed, dried, and counters/wipe sink; trash = empty all bins, new liners, take to curb; floors = vacuum+mop common areas; bathroom = toilet, sink, mirror, shower. Use due-by windows instead of exact times to fit schedules, like dishes done by 10 pm daily, trash out by the night before pickup, floors by Saturday, bathroom by Sunday, with a 12-hour grace window if someone's shift runs late.
Make it visible and rotating without thought: print a 4-week grid with names and dates, laminate it, and stick it on the fridge with a magnet that advances one square every Sunday night. Next to it, put a simple checklist with boxes for each chore and a spot to initial/date when it's done; if the box isn't checked by the deadline, it's an automatic miss. Automate reminders so no person nags: set recurring calendar events or a scheduled message in your group chat that posts "Trash due by tonight" and "Rotate magnet now" every week. Allow swaps, but only if the swap is posted in the chat before the deadline so it's recorded. Consequences that stay chill: a miss means you do the chore first thing the next morning plus one 10-minute make-up from a preagreed list (wipe stovetop, clean microwave, quick hallway vacuum); two misses in a month means you take the least popular chore for the next rotation. If money is tight, avoid fines; if you all prefer a tiny stake, a $2 household-supplies jar per miss works because it benefits everyone. Do a 5-minute Sunday night "tick and flip" where you check boxes, move the magnet, and add any make-up tasks—process handles accountability, not a roommate.
