Gross Dollar Retention (GDR) - aka Gross Revenue Retention (GRR) - rate is similar to the NDR in that it measures the changes in recurring revenue caused due to shifts within the revenue from existing customers. However, the GDR considers only the total revenue minus any revenue from downgrades or churn and does not account for the revenue from expansion due to upsells, cross-sells, and upgrades. Additionally, the GDR measures the net revenue over time as opposed to a set time period like the NDR.