How pricing works
BookNPC has two kinds of books, priced differently. The books you bring are free to listen to with your device's voice, always. On them, you pay only for optional per-book upgrades: a full cast (a one-time, page-by-page analysis that gives each character a voice), translation into another language (the same analysis, at a higher price per page), and studio cloud audio (GPU rendering, billed by the finished audio-hour). Mix them however you like, and switch any time. The catalog of ready-made classics is a separate free lane that credits never touch: you get 60 minutes of listening a day, 30 more for each short ad you watch, or no limit at all with the ad-free plan.