Three kinds of usage
Build credits cover prompts that plan or generate. Cloud credits cover the backend of the app you build. AI credits cover model calls made by your deployed app.
Free accounts get 5 build credits a day, capped at 30 a month, plus a small monthly cloud and AI allowance. None of it rolls over.
Plan credits and top-ups
Plan credits roll over and expire two months after they are issued. Purchased top-ups last twelve months. Spending always uses plan credits first, so credits you paid for keep their value.
Annual billing costs less per month and raises how much rolls over.
Running out
At zero, new build messages are blocked behind an upgrade or top-up prompt. A message already running finishes, published apps keep serving, and the app's backend and AI calls pause until you top up.