HeyGen vs Synthesia: Which Should You Pick?

Both tools turn a typed script into a video of a talking avatar, and neither has an output-quality problem in the public record. The real choice is what you get metered on and who is allowed to say no. HeyGen sells a menu: one credit pool, nine published per-minute rates, and a cost that swings twelvefold depending on which avatar model you click. Synthesia sells a meter: two credits per second of finished video, the same rate whichever avatar presents, and a moderation pass on every video before you can download it. One is priced for a team that will optimize; the other for one that needs a predictable budget line.

The per-minute math depends on a choice you make after you pay

HeyGen publishes a per-feature credit rate card, which is unusual here and makes the arithmetic checkable. Creator is $29/mo month-to-month for 600 credits; push those credits through the published rates and one plan produces four separate economies.

Buying shape	Published rate	Minutes for the money	Per finished minute
HeyGen Creator, Avatar III Video Look	4 credits/min	150/mo	$0.19
HeyGen Creator, Avatar IV Photo Look	16 credits/min	37.5/mo	$0.77
HeyGen Creator, Video Agent (standard)	40 credits/min	15/mo	$1.93
HeyGen Creator, Avatar V	48 credits/min	12.5/mo	$2.32
Synthesia Starter, billed annually	2 credits/sec	120/yr for $216	$1.80
Synthesia Creator, billed annually	2 credits/sec	360/yr for $768	$2.13
Synthesia Starter, billed monthly	2 credits/sec	120/yr for $348	$2.90

Same subscription, same $29, a 12x spread across the four HeyGen rows. Nothing on the pricing page tells you which row you land on, and HeyGen says why: its pricing pages "focus on the value and capabilities of each plan rather than specific minute counts."

Synthesia charges one generation rate regardless of avatar. Every second costs 2 credits, so a minute costs 120 whatever avatar presents, and the tier sets the price. Its other published rates sit outside the render itself: AI dubbing runs 120-240 credits a minute per language, API generation 75, bulk personalization 90. The counterintuitive result: Creator costs 18% more per minute than Starter, $2.13 against $1.80. Upgrading buys API access, personal avatars, and interactive video, not volume efficiency. Monthly billing is the expensive mistake — $348 a year against $216 for identical output, split into twelve separately expiring buckets rather than one annual pool.

Retakes move both numbers unevenly. At two HeyGen renders per keeper, a shipped 30-second clip on Avatar IV Photo Look lands near $0.78. Synthesia bills revisions incrementally rather than rebilling the whole video: only new or modified words cost credits, while reordering, punctuation, framing, and pronunciation fixes cost nothing.

A menu versus a meter is also a trade on control

Synthesia moderates "100% of our content," and names politics, religion, health claims, legal advice, financial advice, adult content, hate, misinformation, and real-world violence among restricted topics. There is no pre-approval system, no per-industry list, free users cannot appeal a rejection, and "multiple submissions of rejected content may result in your account being suspended." Its help center concedes that "prior approval of similar or identical content does not guarantee future approval."

Our sources disagree on what that costs in time. Our platform record says moderation "can add manual review delays of 12-24 hours"; the only figure Synthesia publishes is a 24-hour escalation threshold — contact support if a video has sat longer. The shorter half of that range traces to user reports, not to Synthesia. Budget against 24.

HeyGen is not moderation-free, and it is not more transparent here. Its moderation policy makes political content non-permissible and lets HeyGen "temporarily or permanently suspend the user's access," with appeals routed to a published address. What it does not publish is a screening commitment or any review-time figure, and reviewers on Product Hunt and the review sites describe its moderation as strict and opaque. So neither vendor hands a compliance team a number to plan against. Only Synthesia commits in writing to screening everything, which is worse for a deadline and better for an auditor.

Ownership matches; Synthesia’s moderation does not

Rights match at the top and diverge at the bottom. On HeyGen's paid plans "you own all rights in your User Input or User Output," commercial use included, no per-video fee, no expiry. Its free tier is licensed "solely for personal, non-commercial, and internal evaluation purposes," so running a free-plan clip as a live ad is a breach — a trap Synthesia closes mechanically instead, by refusing free-plan downloads. Synthesia's paid position is narrower but more durable: you own your videos, not the avatars inside them, and your license to those stock avatars survives cancellation, so a clip shipped in 2026 does not go unlicensed in 2028.

Two clauses cut in opposite directions. HeyGen claims a "royalty-free, transferable, sublicensable, worldwide and irrevocable" license over Your Content "including to train or otherwise improve" its models; the Synthesia terms we quote carry no equivalent, which is an absence in our sources, not proof of absence. Against that, Synthesia's acceptable-use policy bars using stock avatars in a way "reasonably likely to make viewers think the real-life actor personally holds, endorses, or actually has your stated opinions" absent Enterprise and the actor's written consent — the exact mechanic of a testimonial ad. On HeyGen, any depicted actor "reserves the right to request removal of their likeness" at any time, and honoring it is your job.

Money back favors HeyGen thinly: a discretionary 15-day window on direct purchases, refusable once "a significant amount of credits has already been created." Synthesia is flat — "All purchases are non-cancelable and... non-refundable," forgotten cancellations do not qualify, and stopping auto-renewal takes 30 days' notice. Credit death runs the other way: HeyGen forfeits the unused balance when you cancel or pause, while Synthesia's monthly allowance never accumulates at all. Neither publishes whether a failed or rejected render refunds credits, a gap that costs more on Synthesia, where every video is screened.

Budget two more line items. A Synthesia Studio Avatar is $1,000/year, annual-plan-only, non-refundable once deployed; an extra HeyGen avatar slot is $29/month or $300/year. One HeyGen figure stays unconfirmed: the $24/mo annual Creator rate sits in our platform record dated 2026-09-02 but could not be re-read from page source.

Third-party sentiment splits identically. G2 rates HeyGen 4.8 (~1,900 reviews) against Synthesia's 4.7 (2,375); Trustpilot rates HeyGen 3.7 (3,088 reviews, 18% one-star) against Synthesia's 3.9 (1,820, 13%). On both, the one-star band is billing and policy, not output.

HeyGen for steady volume, Synthesia for screened corporate video

Buy HeyGen if you ship marketing or localization video at steady monthly volume, will check which avatar tier you land on first, and can absorb a forfeited balance. Its 175+ language translation is the strongest single reason to pick it: 6 credits a minute in Speed mode and 10 in Precision, against 4 for a translation with no lip-sync at all. Do not buy HeyGen if your production is seasonal, if you plan to run free-plan output commercially, if you work in politics, or if your L&D team needs SCORM — Synthesia ships LMS-ready exports, and HeyGen's Business tier lists LMS integrations without one. On forfeiture specifically, the HeyGen alternatives that do not void an unused balance is the shorter list.

Buy Synthesia if you make training, onboarding, or internal comms that get script-updated often, you can commit annually, and predictability beats unit price. Do not buy Synthesia if you want UGC-style ad creative, if a blocked render would miss a regulated deadline, if you cannot commit twelve non-refundable months, or if you were budgeting a custom avatar as a one-time cost.

Neither works if the ad depends on a real person holding your real product. That is a marketplace like Billo or Insense, not a better prompt.