Synthesia survey response: 350 credits is $3.73 to $8.12

One Synthesia Survey Session response costs 350 credits, according to Synthesia's October 1, 2026 plan-change article. Using the prices on Synthesia's pricing page, that is about $3.73 on the Pro annual plan and $8.12 on Starter with monthly billing. Every plan also includes 3 survey responses a month, so the first three are covered before credits are spent.

A Sume question clip is a different thing: one avatar asking one question from a script, with no reply captured. A 15-second question on Standard is $2.76. The comparison only makes sense if you know which of the two you actually need, so the sections below separate them.

Converting 350 credits to dollars

Synthesia does not publish a dollar price per credit. I derived one from the pricing page by dividing each plan price by its monthly credits, the same way for every row. The article lists Pro at 6,000 credits a month and Starter at 1,250. The pricing page lists Starter at $29 monthly or $18 billed yearly, and Pro at $89 monthly or $64 billed yearly.

Why this is an upper-bound sketch

Credits also buy video minutes, so a dollar per credit assumes you spend the whole plan on surveys. Credits that sit unused still cost money, which means the effective price of a response depends on how many responses you actually collect. Treat the table as a ceiling for planning, not a quote.

The Sume side

On Sume you pay per second of finished video. At the catalog rate for Avatar 1.0 without a product image, a 15-second question is $2.76 on Standard ($0.184 a second), $3.68 on Plus and $8.25 on Max. A ten-question interview is ten clips: $27.60 on Standard. You render them once and show them to every respondent.

What you do not get is Synthesia's follow-up behavior. The Sessions launch post says the avatar follows up on responses to dig deeper than a form. A Sume clip is linear. Your own form or app collects the answer, and your own logic picks the next clip, as in the survey-clip pattern.

Rule of thumb

If you expect fewer than 3 responses a month, the included allowance covers it and the credit math is moot. If you expect hundreds, the per-response credit cost dominates and a rendered question set plus a plain form is cheaper but gathers less. Decide whether the follow-up is worth roughly $4 to $8 a respondent.