UST/VSQX Lip Sync Generator

A browser-based tool that automatically creates lip-sync animation videos from UST, USTX, and VSQX singing synthesis project files. Users upload custom mouth shape images for vowels and closed-mouth states, then import their project file and optional audio or background layer. The tool generates precise timing data and exports videos in multiple formats including WebM with transparency, MP4, MOV, MKV, and GIF.

All processing happens locally in the browser with no backend or file uploads. The maker says it was built with Claude Code. Features include multi-track project support, character-specific mouth shape overrides, real-time audio preview, responsive design, dark mode, and support for multiple languages.