Synthesia vs Runway Gen-4: The Complete Comparison
Which video generation tool is right for you? A detailed side-by-side analysis of features, pricing, and performance.
Runway Gen-4 wins for most users due to its free tier and industry-leading character consistency across video clips. Choose Synthesia if you need Training videos. Choose Runway Gen-4 for Professional filmmakers and video producers.
- Price: Synthesia starts at Free, Runway Gen-4 at Free
- Free tier: Both offer free tiers
- Best for: Synthesia → Training videos | Runway Gen-4 → Professional filmmakers and video producers
- Features: 23+ features across 7 categories
- Our pick: Runway Gen-4 for budget-conscious users
Quick Comparison Table
| Feature | Synthesia | Runway Gen-4 |
|---|---|---|
| Vendor | Synthesia | Runway |
| Starting Price | Free | Free |
| Free Tier | Yes | Yes |
| API Access | Yes | Yes |
| Web App | Yes | Yes |
| Mobile App | No | Yes |
| Best For | Training videos | Professional filmmakers and video producers |
What Are We Comparing?
Synthesia
AI video platform for creating presenter videos with digital avatars. Best for training, marketing, and corporate content.
Synthesia creates professional videos featuring AI avatars that speak your script in 140+ languages. It's the leading platform for corporate training, marketing videos, and educational content without needing actors or cameras.
Runway Gen-4
Generate professional AI videos with Runway Gen-4's advanced text-to-video and image-to-video capabilities. Create consistent characters, 4K resolution outputs, and cinema-quality video clips up to 16 seconds.
Runway Gen-4 represents the cutting-edge of AI video generation technology, released in April 2025 with revolutionary capabilities for creating professional-grade video content. The platform transforms text prompts and images into high-fidelity, photorealistic videos with exceptional character consistency, advanced motion control, and 4K resolution output. Gen-4 excels at maintaining coherent storytelling across multiple scenes with consistent characters and objects, making it ideal for narrative-driven projects. Designed for creative professionals and filmmakers, Runway Gen-4 offers advanced editing tools including Aleph for video transformation and Act-Two for character performance capture. The platform generates 5-16 second video clips with cinematic quality, featuring fluid motion, temporal consistency, and detailed visual fidelity. While generation times average 6-7 minutes, the results deliver Hollywood-proven quality suitable for commercial productions, advertisements, and professional content creation workflows.
Synthesia vs Runway Gen-4 Pricing
Here's how the pricing compares between both tools:
Synthesia
Free Tier AvailableRunway Gen-4
Free Tier AvailableFeatures Comparison
Synthesia Features
- ✓ Web App
- ✓ Brand Kit
- ✓ Templates
- ✓ Ai Avatars
- ✓ Api Access
- ✓ Custom Avatars
- ✓ Multi Language
- ✓ Text To Speech
- ✓ Screen Recording
Runway Gen-4 Features
- ✓ Web App
- ✓ Upscaling
- ✓ Api Access
- ✓ Inpainting
- ✓ Mobile App
- ✓ Green Screen
- ✓ Motion Brush
- ✓ Text To Video
- ✓ Image To Video
- ✓ Style Transfer
- ✓ Video To Video
Pros and Cons
Synthesia
Pros
- Realistic AI avatars
- 140+ languages
- Easy to use
- Professional quality
Cons
- Expensive for volume
- Avatar limitations
- Less creative flexibility
- Corporate-focused
Runway Gen-4
Pros
- Industry-leading character consistency across video clips
- 4K resolution output with cinema-quality results
- Advanced editing capabilities with Aleph and Act-Two tools
- 16-second maximum duration longer than competitors
- Hollywood-proven technology used in professional productions
- Exceptional motion control and temporal consistency
Cons
- Slower generation times averaging 6-7 minutes
- Credit-based system can be expensive for heavy usage
- Steeper learning curve for advanced features
Who Should Use Each Tool?
Choose Synthesia if you need:
- Training videos
- Corporate comms
- Educational content
- Marketing
Choose Runway Gen-4 if you need:
- Professional filmmakers and video producers
- Content creators needing character consistency
- Advertising agencies creating commercial content
- Creative professionals in post-production workflows
- Narrative storytellers and animation studios
Final Verdict: Synthesia vs Runway Gen-4
🏆 Winner: Runway Gen-4
After comparing all aspects, Runway Gen-4 comes out slightly ahead for most users. The free tier makes it easy to get started without commitment. Key strength: Industry-leading character consistency across video clips.
Bottom line: Use Synthesia for Training videos. Use Runway Gen-4 for Professional filmmakers and video producers. Both are excellent video generation tools in 2025.
Frequently Asked Questions
What is the difference between Synthesia and Runway Gen-4?
Synthesia is ai video platform for creating presenter videos with digital avatars. best for training, marketing, and corporate content. Runway Gen-4 is generate professional ai videos with runway gen-4's advanced text-to-video and image-to-video capabilities. create consistent characters, 4k resolution outputs, and cinema-quality video clips up to 16 seconds. The main differences are in pricing (Free vs Free), target users, and specific features offered.
Which is better: Synthesia or Runway Gen-4?
Runway Gen-4 is generally better for most users due to its free tier and industry-leading character consistency across video clips. Synthesia is best for Training videos, while Runway Gen-4 shines at Professional filmmakers and video producers.
Is Synthesia free to use?
Yes, Synthesia offers a free tier with limited features. You can upgrade to paid plans starting at Free for more capabilities.
Is Runway Gen-4 free to use?
Yes, Runway Gen-4 offers a free tier with limited features. Paid plans start at Free.
Can I switch from Synthesia to Runway Gen-4?
Yes, you can switch between these tools at any time. Both are standalone services. Consider your specific needs for Training videos vs Professional filmmakers and video producers when deciding.