AI Video Generators Compared: Credits, Privacy and What's Included
Most AI video tools look alike from the outside. The differences are in the fine print: whether your credits disappear, whether your uploads end up training someone's model, and whether the price you see is the price you pay. We read the pages of Runway, Luma and Kling and wrote down what they say. Then we did the same for ourselves, including the parts that don't flatter us.
Where to start
- Privacy
- Credits
- Head to head
- What you pay for
More questions? We also have 100 AI video questions answered.
What we found
| Do credits expire? | May train on your uploads? | Extras | |
|---|---|---|---|
| Runway | Plan credits reset monthly; Max rolls over one month. Credits you buy never expire. | Yes, in its regular terms. | 4K upscaling and audio generation in the plans. |
| Luma | Monthly credits lapse each billing cycle. | Yes, in its regular terms. API and Enterprise have separate terms we haven't read in full. | 4K upscaling, voice and lip sync priced separately. |
| Kling | Membership credits 1 month. Bought credits 2 years. | We couldn't confirm. | Native audio and lip sync. |
| BetterVideo | No. Credits never expire and there's no subscription. | No. | Music or voiceover and the enhancement pass are in the price. Lip sync is 4 or 8 seconds only. |
The sources are Runway's Terms of Use, Runway's pricing page, Luma's Terms of Use, Luma's pricing page and Kling's credits policy.
What this doesn't tell you
Nothing here says one tool makes better video than another. Quality is a separate question, and the only way to answer it is to run your own idea through each. We think ours holds up, and we'd still rather you tested it than took our word for it.
A note on these facts
BetterVideo is independent. We are not affiliated with, endorsed by or sponsored by Runway, Luma, Kling or any other company named here, and their names belong to their owners. We use them only to say which product we mean.
Everything about other companies comes from their own public pages, which we read on October 20, 2026. This is our review of what those pages say, not a claim about how any company behaves in practice, what it intends, or how it treats your data. Where we couldn't confirm something, we say so. Terms, prices and features change without notice, so open the linked source and read the current version before you rely on it. This page is general information and not legal, financial or purchasing advice, and we can't promise it is complete or still current. If something here is wrong, tell us and we will correct it quickly.
Frequently Asked Questions
Quality is subjective and changes with every new model. The terms and the pricing are written down, so anyone can check them.
We re-read the sources when we notice a change and at least every few months. The date at the bottom of each page tells you when we last did.
Try it with one short video
One credit makes a short Full HD video with music or a voiceover. Credits never expire and there's no subscription, so a single test costs you almost nothing.