Create your family chart in the app, print it for the fridge, then log chores with Siri or a tap. Kids keep using the page. Parents get the bookkeeping help.
The paper stays. The bookkeeping is ours.
Six is the age the chart starts to work without a fight. Make the bed, brush teeth, pack the backpack, set the table, tidy the play corner, feed the pet, help with dishes on a good night. Big enough to read the words, young enough that the star column should stay simple.
Five to seven. Enough that there is a star to chase, few enough that the page does not feel like homework. The morning routine takes three rows; the rest of the day takes the rest.
Stars are a record, not a currency. Use them to see what happened during the week. If your family pays for bigger extra jobs, keep that rule separate from ordinary family responsibilities.