Synthesia vs HeyGen is the comparison every marketer, and content team runs into the moment they decide to replace live-action video with an AI avatar. Both platforms turn a script into a talking presenter in minutes, both start at $29/month, and both claim to be the best AI avatar generator on the market but they’re built for genuinely different jobs. Synthesia leans into predictable, minute-based billing, ISO-certified compliance, and SCORM (Sharable Content Object Reference Model)-ready training content, while HeyGen leans into a massive stock avatar library, gesture-driven Avatar IV/V realism, and flexible monthly credits.
If you’re trying to figure out which one actually fits your workflow not just which one has the flashier demo reel this breakdown covers verified 2026 data on avatar counts, custom digital twin pricing, credit math, language coverage, and compliance so you can make the call with real numbers instead of marketing copy.
Synthesia vs HeyGen: Data at a Glance
Every avatar, credit, and compliance figure below carries a “verified as of” date. Confirm live-shifting cells against each vendor’s pricing page before you buy.
| Metric | Synthesia | HeyGen |
|---|---|---|
| Stock avatars (entry tier) | 9 (Free) | 500+ (Free / Creator) |
| Stock avatars (top tier) | 240+ (Enterprise) | 700+ (largely flat) |
| Custom avatar / digital twin cost | $1,000/yr add-on (Studio Avatar, annual plans only) | 1 twin bundled at Business ($149/mo + $20/seat); extra slots ~$29/mo |
| Premium avatar credit cost | N/A (flat minute allocation) | 20 credits/min (Avatar IV/V) |
| Legacy avatar credit cost | N/A | ~3 credits/min (Avatar III) |
| Languages supported | 140+ (some sources 120+; confirm live) | 175+ |
| Max export resolution | Tier-dependent (confirm live) | 1080p (Creator/Pro), 4K (Business) |
| SOC 2 Type II | Yes | Yes |
| GDPR | Yes | Yes |
| ISO 27001 / 42001 | Yes | Not published |
| HIPAA / BAA | Not published | Not published |
| Entry paid tier price | $29/mo (Starter) | $29/mo (Creator) |
| SCORM export | Enterprise tier only | Not a core listed feature (verify) |
What is Synthesia?
Synthesia is an AI avatar video platform built for enterprise training and multilingual content, billed on a minute-based model rather than credits. Free tier includes 9 stock avatars; paid tiers scale to 240+ on Enterprise. A custom Studio Avatar costs $1,000/year as an annual-only add-on, separate from lower-fidelity Personal Avatars (3–5 slots depending on tier). Language support is cited at 140+ (some sources report 120+; confirm live). Plans start at $29/month (Starter), with SCORM export and 1-click translation gated to Enterprise. Synthesia suits teams prioritizing predictable costs, LMS integration, and certified data governance over gesture-heavy avatar realism.
What is HeyGen?
HeyGen is an AI avatar video platform offering a large stock library (500+ on Free/Creator, up to 700+) and motion-transfer avatars (Avatar IV/V) billed via Premium Credits 20 credits/minute for premium models, ~3 credits/minute for legacy Avatar III. One custom digital twin is bundled into the $149/month Business plan (+$20/seat); extra twin slots cost ~$29/month each. HeyGen supports 175+ languages, with lip-synced translation billed at 5–10 credits/minute. Export resolution reaches 1080p on Creator/Pro and 4K on Business. Entry paid tier starts at $29/month (Creator).
Stock Avatar Library Size: Tiered Ladder vs Flat Library
Will your plan tier give enough avatar variety, or is the headline number gated behind a higher price?
- Synthesia’s avatar count is tier-gated
- 9 free, 125+ on Starter, 180+ on Creator, and 240+ on Enterprise. HeyGen instead offers a large stock library, cited between 500+ and 700+, available from its free and Creator tiers upward with little tier gating.
The older “230+” figure in casual comparisons is stale. Current 2026 sourcing shows 240+ stock avatars at the Enterprise tier. So Synthesia buyers should read the number as a ladder, not a flat promise. HeyGen buyers get the big library early, but should verify exact per-tier access at publish time, since library nuances are less consistently documented than Synthesia’s.
Does Synthesia’s free plan include enough avatars for testing?
The free plan gives 9 avatars and watermarked output. That is enough to judge avatar realism and lip-sync. It is not enough to publish. Use it as a trial, then move to a paid tier for a clean export.
Is HeyGen’s library available on every paid tier?
HeyGen exposes 500+ stock avatars from the free tier and grows toward 700+ on paid plans. Access is largely flat, which helps small teams. Confirm the exact tier gating on the live pricing page, as counts shift.
Winner: HeyGen, because its 500+ to 700+ library reaches free and entry-paid users, while Synthesia’s fullest choice sits behind Enterprise.
Custom Avatar and Digital Twin Deployment Cost
What does it really cost, beyond the base plan, to put a photorealistic avatar of a real person into production?
A custom Synthesia Studio Avatar costs $1,000 per year as an annual-only add-on. A HeyGen custom digital twin is bundled into the $149/mo Business plan (plus $20 per seat), with no separate avatar-creation fee at that tier for the first twin.
Synthesia also offers lower-fidelity Personal Avatars, starting with 3 slots on Starter and 5 on Creator, which are distinct from the premium Studio Avatar tier. HeyGen bundles one digital twin into paid plans, but extra custom avatar slots cost around $29/mo or $300/yr each. So “one Business subscription equals unlimited digital twins” is a common false assumption worth flagging.
True 12-month cost for one custom avatar
One Synthesia Studio Avatar: roughly $1,000/yr add-on plus a plan (Starter from $29/mo). One HeyGen digital twin: bundled inside Business at $149/mo, so about $1,788/yr for the plan itself, though it includes team features and 4K.
Winner: HeyGen, because a single bundled twin plus monthly billing beats a $1,000 annual-only add-on for most solo or small-team buyers.
Language and Localization Coverage
Which platform supports more languages for global rollout, and does count vary by tier?
HeyGen supports 175+ languages across paid tiers. Synthesia’s coverage is commonly cited between 120+ and 140+ depending on source and plan. Confirm the live figure on synthesia.io before publishing, since this is a genuine sourcing conflict rather than one settled number.
Delivery differs too. HeyGen bills lip-synced video translation as a credit-metered feature at 5 to 10 credits per minute. Synthesia’s 1-click video translation is gated to Enterprise on some plans, per eesel AI sourcing. That gating matters more to enterprise buyers than the raw language count.
Winner: HeyGen, because 175+ languages and pay-as-you-go translation reach more buyers than Enterprise-gated Synthesia translation.
Pros and Cons of Both Tools
The honest trade-offs on each side.
Synthesia
HeyGen
Who Should Choose Each Tool
Choose Synthesia if…
- ✓You need predictable minute-based budgeting.
- ✓SCORM export and LMS integration matter.
- ✓ISO 27001/42001 certification is required.
- ✓You produce scripted training at scale.
- ✓You want one polished annual spokesperson avatar.
Choose HeyGen if…
- ✓You need several digital twins in one workspace.
- ✓Monthly, flexible billing suits your cash flow.
- ✓Gesture-rich, motion-based avatars matter.
- ✓You want 175+ languages and 4K output.
- ✓Your premium output stays within credit limits.
Imperial AI Tools Verdict
Synthesia and HeyGen solve the same problem in different shapes, so the honest answer is fit, not a blanket winner. Pick Synthesia when you run enterprise training: minute-based billing forecasts cleanly, SCORM plugs into your LMS, and ISO 27001/42001 satisfies procurement. The biggest reason to choose it is predictable cost with certified compliance.
Pick HeyGen when you need several real presenters on camera, flexible monthly billing, gesture-driven Avatar IV realism, and 175+ languages. The biggest reason to choose it is custom-avatar scale without an annual lock-in. A third path works too: run both, using each where it is strongest. One caution binds both tools equally. Neither publishes HIPAA compliance or a BAA, so keep protected health information off both until legal signs off.
Frequently Asked Questions
Both start at $29 per month. For a single custom avatar, Synthesia’s Studio Avatar adds $1,000 per year. HeyGen bundles one digital twin into paid plans, so light custom-avatar users often pay less on HeyGen. Heavy premium output can flip that on credit costs.
Yes. Many teams use Synthesia for structured multilingual training and HeyGen for marketing clips needing gesture range. Export videos as MP4 from either platform. There is no direct migration of custom avatars between them, since each avatar is locked to its own platform.
Switch to HeyGen if you need multiple digital twins, monthly billing, or wider language coverage at 175+. Stay on Synthesia if you rely on SCORM export, ISO certifications, or capped minute costs rather than variable credit burn. Test both free tiers before deciding.
Neither publishes HIPAA (Health Insurance Portability and Accountability Act) compliance or offers a signed Business Associate Agreement as of 2026. Both hold SOC 2 Type II and GDPR. For content involving protected health information, neither tool qualifies without a separately negotiated agreement, so escalate to legal first.
