So the plan holds
Plan the week together on Sunday evening, not in passing during the week. One chore per kid and day is enough; whoever writes everything down ticks nothing off. Kitchen and bathroom need a sentence for when they are done — «floor damp-mopped, drain clear» — or every box becomes an argument. What is on the sheet holds for this one week. Next week a new sheet: no catching up, no debt.
Paper or app
The sheet is enough while everyone is at home and someone keeps the overview. Once photo proof, one-tap confirmation and a weekly report by mail become useful, you continue the same plan in Sackgeld. The start list is identical; you adjust your own chores in the app afterwards. 30 days free, sign-in by e-mail link.