HeyGen

HeyGen is an AI video generation platform that creates talking avatar videos from text or audio scripts. Users pick from a library of stock avatars or create a custom digital twin from a short video recording, then type a script or upload audio, and HeyGen produces a video of that avatar speaking with synced lip movements and facial expressions. It supports dozens of languages and can dub existing footage into other languages while matching the speaker's lip movements, which has made it popular for localizing training and marketing content.

The main users are marketing teams, sales orgs, corporate learning and development departments, and course creators who need video content at scale without booking a camera crew or talent. Common use cases include personalized outreach videos, product explainers, internal training modules, and multilingual versions of existing videos. It's available as a web app with an API for teams that want to generate avatar videos programmatically, for example personalizing thousands of sales videos with a viewer's name pulled from a spreadsheet.

HeyGen differentiates on lip-sync and facial realism, which is often cited as ahead of competitors like Synthesia and D-ID, and on its interactive avatar feature that lets an avatar respond in real time during a live conversation rather than just reading a pre-written script. It also offers avatar cloning from a short smartphone video, lowering the bar compared to platforms that require a studio shoot.