If you’re replacing a camera, a studio, and a presenter with an AI avatar, the shortlist is two names: Synthesia and HeyGen. They look similar in a demo and cost similar money, but they’re built for different buyers — one for the L&D team, one for the marketing team.
The 15-second answer
- Corporate training, compliance, many languages: Synthesia ($18/mo).
- Marketing, product demos, your own likeness: HeyGen ($29/mo).
Side by side
| Synthesia | HeyGen | |
|---|---|---|
| Paid from | $18/mo | $29/mo |
| Built for | Enterprise L&D | Marketing & creators |
| Avatar library | 230+ | Large, high realism |
| Languages | 140+ | Strong + video translate |
| Personal avatar (your likeness) | Yes (custom) | Core strength |
| Compliance | SOC 2 | — |
| Templates | Yes, extensive | Fewer |
| API | Yes | Yes, developer-friendly |
Pricing is indicative and changes often — check each tool’s site for current plans.
Synthesia — the enterprise standard
Synthesia is what large organisations buy, and the reasons are unglamorous: SOC 2 compliance, 230+ stock avatars, 140+ languages, and a template system that lets a non-designer produce an on-brand training module without help. If your job is turning a policy document into a course that 4,000 employees will watch in eleven languages, this is the tool — and at $18/mo it’s also the cheaper of the two.
Where it’s weaker: the output can feel corporate. That’s fine for internal comms and a liability for social content.
HeyGen — the realism and likeness play
HeyGen pushes harder on avatar realism and, critically, on personal avatars — cloning your own face and voice so the video is recognisably youat scale. Its video-translate feature (re-voicing existing footage into another language with matched lip sync) is the standout trick, and the API is the friendlier of the two if you’re generating video programmatically.
It’s the pick for founder-led marketing, personalised sales outreach, product demos, and localising content you’ve already filmed.
How to decide
- Compliance/procurement will review this → Synthesia (SOC 2).
- Training content in many languages → Synthesia.
- I want videos that look like me → HeyGen.
- Translating existing footage → HeyGen (video translate).
- Generating video from code/at volume → HeyGen API.
- Non-designers must self-serve → Synthesia templates.
The bottom line
Synthesia is the safer enterprise purchase; HeyGen is the better creative one. If the video is about the company, Synthesia. If the video is about a person, HeyGen. Both have free tiers — make one short video in each before committing, because avatar quality is very much a matter of taste. See the full ranking on our best AI avatar generators page.
Comparing something else? Build any pair on our comparison pages, or browse every category in the best of 2026 rankings.