Knull's AI work runs on credits. There are three kinds, kept separate so you always know what you're spending on:
| Credit | What it pays for |
|---|---|
| KC — Knull Credits | General AI work: research, writing, analysis, skills. |
| DC — Design Credits | Images, video, creative generation. |
| AC — Ad Credits | Actual ad spend, passed straight through to the platforms (Knull takes no cut). |
Each plan (Free, Starter, Pro, Scale) includes a monthly allocation. You can top up anytime — there's a balance in the top bar that's always one click from a refill — and turn on auto-top-up so you never run dry mid-task. When you're running low, Knull warns you visually and drops a card in your Inbox before anything breaks.