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Head-to-Head Comparison
Stable Diffusion vs Synthesia
An honest, side-by-side breakdown of pricing, features, and security — so you can pick the right tool.
Published Last updated
- Synthesia is cheaper to start — £23/mo versus £40/mo for Stable Diffusion.
- Stable Diffusion is best for developers who want open-source AI image generation; Synthesia for teams building AI video into their products.
Stable Diffusion
AI Image
7.5/ 10
Free · Free tier
Best for developers who want open-source AI image generation
Visit Stable DiffusionSee all AI Image Generators →
Synthesia
AI Video
8.1/ 10
Free · Free tier
Best for teams building AI video into their products
Visit SynthesiaSee all AI Video →Some “Visit” links are affiliate links. How we earn →
Feature comparison
| Feature | Stable Diffusion | Synthesia |
|---|---|---|
| CompareMyAI score | 7.5 / 10 | 8.1 / 10 |
| Free tier | ||
| API access | ||
| Open source | ||
| Enterprise ready | ||
| GDPR compliant | ||
| Vendor holds SOC 2 | ||
| Vendor holds ISO 27001 | ||
| MFA supported | ||
| Trains on your data |
Certifications may only cover business or enterprise plans. Check the vendor’s trust page for your plan.
Synthesia comes out ahead — and you can try it free.
Try Synthesia freeAffiliate link · how we earn
Pricing
Price checked with vendor on
Self-hosted (free)Free
Brand Studio TrialFree
Enterprise—
FreeFree
Enterprise—
Always check the provider's site for the latest pricing.
Pros & cons
Stable Diffusion
Pros
- +Open source and free to run locally
- +Maximum privacy — no data leaves your machine
- +Highly customisable with community models
Cons
- −Technical setup required
- −No managed hosted version
- −Quality depends heavily on prompt skill and model choice
Synthesia
Pros
- +Professional AI avatar videos
- +140+ languages
- +No filming required
- +Good for corporate training and eLearning
- +SOC2 certified
Cons
- −Expensive for small teams
- −Avatar realism still has uncanny valley moments
- −Limited creative flexibility
Our take— Synthesia wins
Based on our comparison of published pricing, features, and compliance data, Synthesia scores 8.1/10 to Stable Diffusion's 7.5/10. Synthesia pulls ahead with enterprise-grade readiness. Stable Diffusion counters with an open-source codebase. Pick Synthesia if you need enterprise-grade readiness; pick Stable Diffusion if you need an open-source codebase.
Frequently asked questions
Which is cheaper, Stable Diffusion or Synthesia?
Synthesia is cheaper to start, with its lowest paid plan at £23/mo versus £40/mo for Stable Diffusion. These are each vendor's published prices and can change, so check before you buy.
Does Stable Diffusion train on your data?
Based on published vendor information, Stable Diffusion does not train its models on your data. Policies can differ by plan and change over time, so it is worth confirming the current terms on the vendor's site.
Does Synthesia train on your data?
Based on published vendor information, Synthesia does not train its models on your data. Policies can differ by plan and change over time, so it is worth confirming the current terms on the vendor's site.
Are Stable Diffusion and Synthesia GDPR compliant?
Based on published vendor information, both Stable Diffusion and Synthesia state they are GDPR compliant. Vendor-level compliance does not remove your own obligations when you process personal data through either tool.
Do Stable Diffusion and Synthesia have a free tier?
Yes — both Stable Diffusion and Synthesia offer a free tier, so you can try each one before committing to a paid plan. Free tiers usually come with usage limits.