· design

Synthesia vs HeyGen

On what the policies say, Synthesia is the better choice for your data: graded B against HeyGen's D.

Grades read the plan most people are on. Each company's full entry has every plan, every clause and the archived copy it was read from.

Synthesia

Synthesia's policy answers the question for your face and voice — a closed list of purposes, then destruction. For your scripts and finished videos it defers to an agreement your employer signed.

Verdict

By default: Does not train on you by default
The way out: No opt-out in the policy
What B means: Off by default. Training happens only if you opt in, or not at all.
Last checked: 5 Oct 2026

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HeyGen

HeyGen trains on your input to make its avatar models more accurate. The opt-out exists and runs through an email address.

Verdict

By default: Trains on you by default
The way out: Opt out by contacting support
What D means: On by default. An opt-out exists, but you have to go looking for it.
Last checked: 5 Oct 2026

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Synthesia: every plan

Synthesia · what each plan can refuse · checked 5 Oct 2026

2 PLANS

Plan

Exposure

Trains

Opt-out path

Retention

De-identified

Human review

Your likeness (Biometric Data)

17 / 100

Nothing to switch off

Not stated

Unknown

How the score is made17 / 100 · the rubric

Default13 / 50

Training happens only if you opt in

Way out0 / 33

Nothing is on, so nothing needs refusing

Paywall0 / 4

No paywall on the control

Scope0 / 4

One kind of data is in scope

Human review2 / 4

The policy does not say whether people read it

De-identified2 / 2

Nothing is said about de-identification

Scripts, uploads and finished videos (Customer Data)

UNCLEAR

Not established, see below

Not stated

—

Not established

EVERY CELL ABOVE IS SOURCED FROM A QUOTED CLAUSE OR A DOCUMENTED SEARCH · SEE THE EVIDENCE ABOVE

EXPOSURE IS SCORED 0–100 ON ONE AXIS, HOW HARD IT IS TO STOP THIS PLAN TRAINING ON YOU. THE GRADE IS THE BAND IT FALLS IN: A 0–10 · B 11–25 · C 26–45 · D 46–60 · E 61–80 · F 81–100. HOW THE SCORE IS SET

Your likeness (Biometric Data)TRAINS: NO

OPT-OUT: Nothing to switch off
RETENTION: Not stated
EXPOSURE: 17 / 100
DE-IDENTIFIED: Not stated
HUMAN REVIEW: Unknown

Scripts, uploads and finished videos (Customer Data)UNCLEAR

OPT-OUT: Not established
RETENTION: Not stated
EXPOSURE: —
DE-IDENTIFIED: —
HUMAN REVIEW: Not established

HeyGen: every plan

HeyGen · what each plan can refuse · checked 5 Oct 2026

1 PLAN

Plan

Exposure

Trains

Opt-out path

Retention

De-identified

Human review

All plans

55 / 100

YES

Contact support

Not stated

Unknown

How the score is made55 / 100 · the rubric

Default32 / 50

On by default, with a way out

Way out18 / 33

Refusing means writing to the company

Paywall0 / 4

No paywall on the control

Scope1 / 4

2 kinds of data are in scope

Human review2 / 4

The policy does not say whether people read it

De-identified2 / 2

Nothing is said about de-identification

EVERY CELL ABOVE IS SOURCED FROM A QUOTED CLAUSE OR A DOCUMENTED SEARCH · SEE THE EVIDENCE ABOVE

All plansTRAINS: YES

OPT-OUT: Contact support
RETENTION: Not stated
EXPOSURE: 55 / 100
DE-IDENTIFIED: Not stated
HUMAN REVIEW: Unknown

Every grade on this page is the one on the company's own entry, read from a dated, archived copy of its policy. Nothing here is computed separately. How grades are set · All comparisons