› A free AI video generator is most useful for evaluating a specific task before paying, but free tiers differ sharply in credits, available models, and export conditions.
› Google Flow documents a daily allowance, Runway offers a one-time pool, and Pika's Free account lists no included monthly credits.
› This breakdown draws on official documentation checked on October 18, 2026, marking details that could not be independently verified.
› In short Check whether an allowance renews or is provided only once.