Synthesia generates AI avatars reading scripts. Runway generates AI cinema. They solve completely different problems. Most teams that do serious video work buy both.
The 30-second comparison
| Synthesia | Runway | |
|---|---|---|
| Output type | Avatar talking-head videos | Scenic AI video (text/image-to-video) |
| Entry price | $22/mo Starter | $15/mo Standard |
| Best for | Training, corporate, explainers | Ads, creative, film B-roll |
| Languages | 140+ | English-led |
| Editing tools | Lightweight | Director-level |
| Avatar library | 230+ | None (different product) |
When Synthesia wins
Talking-head explainers. Anything where someone needs to read a script to camera.
Multilingual content. 140+ languages with quality lip-sync.
L&D and corporate training. Built for the use case.
Compliance and consent flows. Stricter content controls than Runway.
When Runway wins
Cinematic AI video. Gen-4 model produces 5-10 second clips that are genuinely usable in ads and film.
Director-level control. Camera moves, motion brush, lip sync overlays.
Creative iteration. Designed for the "20 versions of this shot" workflow.
Stock-quality B-roll. Generate scenes without licensing stock footage.
The verdict
- Training videos → Synthesia
- Marketing explainers → Synthesia
- Ads and creative → Runway
- Film B-roll → Runway
- Both — most serious video teams
For the marketing-AI landscape: HeyGen vs Synthesia and The 15 best AI agents of 2026.