VS
Head-to-Head Comparison
HeyGen vs Stable Diffusion
An honest, side-by-side breakdown of pricing, features, and security — so you can pick the right tool.
Published Last updated
- HeyGen starts at US$29/mo and Stable Diffusion at £40/mo — published in different currencies, so not a like-for-like figure.
- On privacy, Stable Diffusion offers a no-training-on-your-data policy where HeyGen does not.
- HeyGen is best for teams building AI video into their products; Stable Diffusion for developers who want open-source AI image generation.
HeyGen
AI Video
8.0/ 10
Free · Free tier
Best for teams building AI video into their products
Visit HeyGenSee all AI Video →
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 →Some “Visit” links are affiliate links. How we earn →
Feature comparison
| Feature | HeyGen | Stable Diffusion |
|---|---|---|
| CompareMyAI score | 8.0 / 10 | 7.5 / 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 | Yes |
Certifications may only cover business or enterprise plans. Check the vendor’s trust page for your plan.
HeyGen comes out ahead — and you can try it free.
Try HeyGen freeAffiliate link · how we earn
Pricing
Price checked with vendor on
FreeFree
CreatorUS$29/mo ≈£21.79/mo
Enterprise—
Pro - 100,000 credits/moUS$4,300/mo ≈£3,231.61/mo
Self-hosted (free)Free
Brand Studio TrialFree
Enterprise—
Always check the provider's site for the latest pricing.
Pros & cons
HeyGen
Pros
- +SOC 2 Type II certified with a dedicated Data Protection Officer
- +175 languages with AI lip-sync — broadest language support in category
- +Free tier includes 3 videos and a custom digital twin
- +API access from Creator tier for workflow automation
Cons
- −Uses user content to train models by default — opt-out required
- −Credit costs for Avatar IV/V are 20× higher than Avatar III
- −Business tier at £117/mo is expensive for smaller teams
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
Our take— HeyGen wins
Based on our comparison of published pricing, features, and compliance data, HeyGen scores 8.0/10 to Stable Diffusion's 7.5/10. HeyGen pulls ahead with enterprise-grade readiness. Stable Diffusion counters with a no-training-on-your-data policy. Pick HeyGen if you need enterprise-grade readiness; pick Stable Diffusion if a no-training-on-your-data policy matters.
Frequently asked questions
Does HeyGen train on your data?
Based on published vendor information, HeyGen may use your data to help train its models. Training is sometimes opt-out, or switched off on paid and business plans, so review the privacy settings in your account.
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.
Are HeyGen and Stable Diffusion GDPR compliant?
Based on published vendor information, both HeyGen and Stable Diffusion state they are GDPR compliant. Vendor-level compliance does not remove your own obligations when you process personal data through either tool.
Do HeyGen and Stable Diffusion have a free tier?
Yes — both HeyGen and Stable Diffusion offer a free tier, so you can try each one before committing to a paid plan. Free tiers usually come with usage limits.
Which has an API, HeyGen or Stable Diffusion?
Both HeyGen and Stable Diffusion offer API access, so developers can build either into their own products and workflows.