See how long every card has sat still.

Head to the Trello Power-Up Marketplace, search for “Card Age” and click Add. The settings popup opens on enable with the defaults already filled in — press Save and the badges are live. There is no authorization step and no account to create.

By default the badge counts full days since the card’s last activity — any comment, move or edit resets it. Switch “Measure age from” to card creation and it counts from the day the card was made instead. Either way the Created date on the card back is read from the card’s own Trello id, which carries its creation time.

Yes — open the Power-Up’s settings from the board menu or the board button at any time. Each of the three tiers takes a day count and a colour from Trello’s badge palette. The numbers have to climb (aging fewer days than warn, warn fewer than stale), and aging set to 0 turns that tier off.

Tick them under “Never badge cards in” in the settings popup. Cards in those lists carry no badge however old they get, and they’re left out of the stale count on the board button — handy for a Backlog or a Done list that is supposed to sit still.

Yes. Tiers, colours, the age source and the skipped lists are all stored on the board and shared by every member, so a card that reads red for you reads red for everyone. Change the settings once and the whole board follows.