Runway Gen-4 vs Synthesia
Last updated: November 2026
Runway's flagship 2026 video model with cross-shot character consistency, world models, and the most mature creator toolchain in the category. Compare it with Synthesia: The enterprise leader for AI avatar video — 240+ stock avatars, personal avatars, 1000+ voices, 160+ language dubbing, and a polished business workflow.
Quick Overview
| Runway Gen-4 | Synthesia | |
|---|---|---|
| Price | $15/month | $29/month |
| Type | Closed source | Closed source |
| Free Option | Yes | Yes |
Detailed Comparison
Run this comparison yourself
Same prompt, same aspect ratio — only the model changes. Run it on each one and judge the difference on your own screen.
Test prompt · Aspect ratio 16:9
A red fox trots through fresh knee-deep snow at dawn. The camera tracks low beside it at the same speed, snow kicking up from its paws, breath visible in the cold air, warm golden backlight through bare birch trees.
Runway Gen-4 isn't on Imgo — copy the prompt to test it there.
Synthesia isn't on Imgo — copy the prompt to test it there.
- Run it on Seedance 2.0 instead
Which One Should You Choose?
Choose Runway Gen-4 if you need
- •Agencies producing premium ad and brand films end-to-end
- •Editorial teams that want a single tool for shot, motion, and finishing
- •Studios needing reliable character continuity across cuts
Choose Synthesia if you need
- •Learning & Development teams producing onboarding and training video at scale
- •Internal comms and HR video that needs to ship in many languages
- •Sales and customer-success teams personalizing outreach video