Do unused Draftbit credits roll over?

Each grant of credits is its own lot with its own expiry date, and the Credits page under Billing lists every active lot with the date it expires.

Monthly subscriptions grant their credits at the start of each billing period, including the credits from a monthly credit package. Anything you don’t spend carries over and stays usable until one year after that period started, so credits from a quiet month are still there when a bigger build comes along.

Yearly subscriptions grant twelve months of credits up front, and they expire at the end of that yearly term. One-time purchases expire one year after purchase, the 3,000 signup credits expire one year after signup, and credits earned through challenges on the Earn Credits page expire one year after you claim them. The one exception is credits added when you import a Draftbit Classic app, which expire 72 hours after the import.

Spending always takes from the lot that expires soonest, so buying a top-up never causes older credits to go unused. Your balance only counts credits that have not expired. An upgrade that restarts your billing cycle has its own rules for credits, described in the plan change answer.