Which AI video tools work without a monthly subscription?

Few. Most of the category is subscription-first: Runway starts at $15/month, HeyGen at $29, Synthesia at $18, Pictory at $19. You pay whether or not you publish that month.

Leaxor is pay-as-you-go with no subscription tier at all. Credits cost $0.10 each with a 50-credit ($5) minimum, and they never expire. A finished video costs 15, 30 or 90 credits depending on quality tier — so $1.50 to $9.00 per video, paid only when you make one.

Some subscription tools sell credit top-ups on top of a plan, which is not the same thing: you still pay the monthly floor.

When a subscription is genuinely cheaper: if you publish daily and consistently, a flat monthly fee usually beats per-unit pricing. Pay-as-you-go wins for irregular output, seasonal channels, testing a niche, or anyone who has previously paid for months they didn't use.