HeyGen

HeyGen is the closest competitor to Synthesia in the AI avatar video space, and in several areas — particularly video translation — it leads the market. Its Video Translation feature can dub any video into 40+ languages, synchronising lip movements to match the new language while preserving the original speaker’s voice quality.

The free tier gives 1 credit (approximately 1 minute of video). Creator ($24/mo) gives 15 credits/month and access to most features. Business ($120/mo) unlocks more credits, 4K resolution, and team collaboration.

HeyGen’s avatars are among the most realistic available — including hyper-realistic Expressive Avatars that replicate natural facial expressions. Custom avatar creation (cloning yourself) requires a 2-minute video recording. The Streaming Avatar API lets developers embed real-time interactive avatars into their own applications — a feature used for customer service bots, virtual tutors, and sales tools.

Pros: Best video translation with voice preservation, hyper-realistic avatar quality, real-time Streaming Avatar API, good language coverage.
Cons: Expensive per-credit pricing limits heavy use, free tier is very limited, custom avatar creation takes processing time.

Best for: Global businesses needing multilingual video content, online educators, sales teams, and developers building interactive avatar applications.