Start with one 30-second script, not a full campaign. Localise it into your three hardest target languages first, because German expansion, Japanese phrasing and Spanish CTA wording often expose different problems.
Do the credit maths per finished variant. HeyGen translation can cost 4, 6 or 10 credits per minute depending on mode, while higher-end avatar modes cost more; that polish is useful, but batch localisation can burn credits quickly.
Treat glossary and pronunciation controls as buying criteria. Synthesia can apply glossary terms for AI Dubbing when a workspace glossary is configured, which helps product-name consistency; still, verify the final audio before approving paid media.
Match the tool to the marketing job. Use HeyGen if customer-facing realism matters most, Synthesia if product marketing overlaps with enablement or compliance, Creatify if you need many UGC-style ad variants, and Vidnoz if budget testing comes first.
Check caption expansion before export. A translated CTA can be longer than the English original, so watch lower thirds, product labels and buttons in every language before you spend credits on a full set.
Use free plans for workflow testing, not final ads. Creatify Free exports with a watermark, while Vidnoz Free is limited to 720p export; both can still help you test product names and CTA accuracy before upgrading.
