Sync-3

16B lip-sync model that processes whole shots — not frame-by-frame stitching.

Sync-3 is the latest model from YC W24 startup Sync Labs, featuring 16 billion parameters trained specifically for video lip synchronization. Unlike earlier lip-sync approaches that patch frames one at a time (creating the uncanny stitching artifacts common in dubbed video), Sync-3 processes entire shots holistically, resulting in natural jaw movement, skin tone consistency, and temporal coherence across the full shot. The model handles some of the hardest edge cases in lip sync: close-up shots where mouth detail is scrutinized, occlusions like hands or microphones partially covering the mouth, extreme camera angles, and challenging lighting conditions like direct sun or low-light environments. It supports dubbing in 95+ languages at up to 4K resolution. It's available as a web app, REST API, and an Adobe Premiere plugin for professional post-production workflows. Sync Labs' CTO, Rudrabha Mukhopadhyay, is a recognized researcher in the lip sync space (co-author of the influential Wav2Lip paper). The team has been quietly iterating since their YC batch and Sync-3 represents a significant jump in quality over the previous generation. For content studios doing multi-language localization, this competes directly with Eleven Labs' and HeyGen's dubbing products.

Panel Reviews

The Builder

Developer Perspective

Ship

“The REST API is clean and the Adobe Premiere plugin is a genuine workflow improvement for post-production teams. The 4K support at 95 languages is a strong combo. Pricing is competitive with HeyGen and ElevenLabs Dubbing, and output quality on test footage is noticeably sharper.”

The Skeptic

Reality Check

Skip

“The 'holistic shot' framing is compelling but the demos mostly show frontal, well-lit footage. Real-world test results on challenging profile shots and heavy occlusion are sparse. This market is also brutally competitive — HeyGen, ElevenLabs, and D-ID are all shipping rapidly.”

The Futurist

Big Picture

Ship

“Automatic dubbing at broadcast quality will fundamentally change how media is localized. A 16B model that handles occlusions and extreme angles closes the last remaining gap between AI dubbing and human ADR work. This is infrastructure for the post-language-barrier internet.”

The Creator

Content & Design

Ship

“I've been waiting for a lip-sync tool that doesn't make faces look like rubber. The temporal coherence across a full shot is the key advance here — previous tools always had that weird flickering at shot edges. The Premiere plugin integration is a genuine unlock for video editors.”