How to choose an AI video generator
Published · Updated · Sources checked 2026-10-08
"Best AI video generator" isn't one question. A tool that makes stunning 8-second cinematic shots can be the wrong choice for a talking-head training video, and the reverse is true too. Start with the job, then pick the tool.
This guide explains what to check. It does not rank tools. Every video tool on our site is marked NOT YET TESTED until our tests are done.
Results: Video tests are scheduled after our meeting-notes and image tests. We plan to publish first video results in late October 2026 on the job rankings linked below. If the date moves, the ranking pages will say so.
1. Which job are you doing?
| Job | What matters most | Our ranking page |
|---|---|---|
| Cinematic scene, consistent character | Motion quality, the same face across shots, camera control | Cinematic video |
| 15-second social ad | Speed, vertical format, product looks right, commercial rights | Social ads |
| Talking avatar / training video | Lip-sync, script accuracy, languages, editing slides and scenes | Avatar video |
| Animate a product photo | The product stays identical and doesn't warp | Image-to-video |
| Lots of short clips on a budget | Cost per usable clip, not per clip | Cheap AI video |
2. Count usable clips, not clips
Video models fail often: hands melt, text warps, a product changes colour halfway through. Credits get spent on failures too. So the real price is price per attempt ÷ share of attempts you'd actually use. A cheaper tool that needs four tries can cost more than an expensive one that needs one.
When you try a tool, run the same prompt 3 times and count how many you would publish.
3. Free plans differ a lot
Examples from official pricing pages (checked 2026-10-08; these change often):
- Runway: "Free forever" with 125 one-time credits (runwayml.com/pricing).
- HeyGen Free: 3 videos per month, up to 1 minute (heygen.com/pricing).
- Synthesia's free allowance: 10 minutes of video creation or dubbing; the videos carry a Synthesia watermark (synthesia.io/pricing).
- Google Flow lists 50 daily credits on all tiers (labs.google/flow/about).
- Luma's pricing page lists no free tier, and lists "Commercial use" from the Plus plan (lumalabs.ai/pricing).
These are the vendors' descriptions, not our test results.
4. Watermarks and commercial rights
Before you plan a campaign around a free or cheap plan, check:
- Is there a visible watermark? Some tools remove it only on paid plans.
- Does the plan allow commercial use? If the pricing page doesn't say, look in the terms of service. We record "not stated" rather than guess.
- Content labelling rules. In the EU, the AI Act's Article 50 transparency rules require deployers of deep fakes to disclose that content is AI-generated or manipulated, and require providers to mark synthetic output in a machine-readable way (AI Act, Article 50; the page lists 2 August 2026 as the date it applies; checked 2026-10-08). Platforms such as TikTok and YouTube also have their own AI-label settings.
5. People and likeness
Avatar tools and some video tools can make realistic people. Use only your own likeness, licensed stock avatars, or people who have given written consent. Read the tool's acceptable-use policy before you upload anyone's face or voice.
How we test video
- Fixed prompts per job: a character scene, a 15-second product ad, an avatar script and an image-to-video product shot.
- 3 runs per prompt, first 3 outputs kept.
- Measured: time to output, cost per usable clip, failure rate.
- Judged: quality, rated by blind panels who don't know which tool made each clip.
Every clip is archived with its prompt and file hash. Details: how we test AI tools.
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