HeyGen vs Synthesia
Avatar video: the SMB stack or the enterprise default? Scores from the RXed AI Periodic Table v1.0 — identical 20-element scale, deterministic overall. How we audit →
At a glance
Scope = elements of the AI stack in the tool’s stated scope (dashed = honestly out of scope, never a penalty). Quality = how well it scores on what it covers. No single number — both axes, always.
The verdict
HeyGen (Scope 14/20 · Quality 6/10) is the SMB pick — the most complete avatar-video stack for small teams, with a real API, MCP and consent guardrails — as long as you budget for the credit meter, not the sticker price: premium engines and lip-synced translation burn the pool fast. Synthesia (Scope 11/20 · Quality 5/10) is the enterprise default: best-in-class avatar quality, compliance and SCORM/LMS depth, with a thin AI-platform surface behind it — no embeddings, no fine-tuning, no agents, and API access gated behind the Creator tier. Recurring multilingual product and marketing video → HeyGen. Governed corporate training at scale → Synthesia.
Where the quality sits
Family mean over covered elements only — a dash means the family is honestly outside that tool’s scope.
| HeyGen Scope 14/20 · Quality 6/10 audited 2026-07-10 | Synthesia Scope 11/20 · Quality 5/10 audited 2026-07-13 | |
|---|---|---|
| Vendor | HeyGen | Synthesia Limited |
| Origin | US | UK |
| Pricing | Free (3 videos/mo, watermark) · Creator ~€25 ($29/mo, $24 annual) · Pro from ~€42 ($49/mo, credit tiers to $4,300) · Business ~€128 ($149/mo) + ~€17/seat · Enterprise custom · API pay-as-you-go from ~€4 | Free (10 min/mo, watermarked) · Starter ~€27/mo (10 min) · Creator ~€83/mo (30 min, API) · Enterprise custom (typically €8–15k+/yr); credit-based system |
| Pr Prompts | 7 | 6 |
| Em Embeddings | — | — |
| Cx Context | 6 | 7 |
| Tr Tracing | 5 | 4 |
| Lg LLM | 6 | 5 |
| Fc Function calling | 5 | 3 |
| Vx Vector store | — | — |
| Rg RAG | 6 | 6 |
| Gr Guardrails | 7 | 6 |
| Mm Multimodal | 9 | 8 |
| Ag Agents | 8 | 4 |
| Ft Fine-tuning | 7 | — |
| Fw Frameworks & harnesses | 7 | 4 |
| Ev Evaluations | 2 | 3 |
| Sm Small models | 5 | — |
| Ma Multi-agent | — | — |
| Sy Synthetic data | — | — |
| Pc Protocols | 8 | — |
| In Interpretability | — | — |
| Th Thinking models | — | — |
Hover any score for the written reason. Full detail: HeyGen passport → · Synthesia passport →