Both let you turn a script into a video of a realistic presenter. The differences show up in avatar realism, multi-language, and pricing flexibility.
HeyGen wins on avatar realism, custom-avatar workflow, and the freshest features. Synthesia wins on enterprise compliance, language coverage, and stability at scale.
Pick HeyGen if you want the most natural-looking avatars and the best self-clone workflow for marketing and creator work.
Pick Synthesia if you are an enterprise L&D or comms team that needs SOC 2, 140+ languages, and a stable template library.
Yes, both support custom avatars. HeyGen's flow is faster and cheaper; Synthesia's is more controlled and gated.
Both are strong. HeyGen tends to edge ahead on tone matching; Synthesia is more consistent across rare languages.
HeyGen is the default for short-form ad creative. Synthesia is rarely used for ads because it is positioned for internal video.