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AI Video Generation

Best AI Video Generators: Runway, Synthesia, HeyGen and Descript Compared

Which AI video tool fits your project? We compare generative video, avatar presenters and AI editing tools.

By AI Resource Hub Editorial TeamUpdated 2 min read
On this page
  1. Quick recommendations
  2. Runway
  3. Synthesia
  4. HeyGen
  5. Descript
  6. Our view
  7. Before you pay
  8. Related guides

How we compare tools: product facts (features, plans, platforms) come from each company's official website and documentation at the time of review. Sections marked Our view are editorial judgement. Plans and features change often, so check the official pricing pages before you buy.

"Best AI video generator" depends on what you're making. These tools solve different problems, so start with the type of video.

Quick recommendations

You want to…ConsiderWhy
Generate cinematic clips from text or imagesRunwayLeading generative video and editing tools
Make training videos with a presenterSynthesiaAvatar presenters, many languages, business focus
Translate your videos or make marketing avatar videosHeyGenVideo translation with lip sync, custom avatars
Edit podcasts, tutorials and talking-head videosDescriptEdit video by editing the transcript

Runway

Best for creators and agencies who need original footage: B-roll, visual effects, concept videos. Clips are short and work best combined in an editor. Uses credits, which go quickly with retries. Runway details.

Synthesia

Best for organisations producing training, onboarding and explainer videos, especially in several languages. Updating a video means editing the script. Synthesia details.

HeyGen

Best for marketers and creators who want avatar videos or to translate existing videos into other languages. HeyGen details.

Descript

Best if you film real people – yourself, interviews, podcasts. AI features speed up editing rather than generating footage. Descript details.

Our view

For most YouTubers and small businesses, recording real video and editing with an AI-assisted editor gives the most authentic results. Use generative tools for supporting visuals, and avatar tools when you need scalable training or translation.

Before you pay

  1. Use free plans to make one real video.
  2. Count how many credits or minutes it actually took.
  3. Check commercial-use rights and watermark rules for your plan.
  4. Check consent rules for avatars and voice cloning.

Frequently asked questions

What is the best free AI video generator?

Several tools have limited free plans. The best one depends on whether you need generated footage, avatars or editing.

Can AI create a whole YouTube video?

It can help with each stage, but a good video still needs a strong script, editing and your own perspective.

AI Resource Hub Editorial Team

Our editors research AI tools using official documentation and reliable reporting, and update guides when products change. Read our editorial policy to see how we work. Editorial policy.

Tools in this guide

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