Nightingale – open-source karaoke app that works with any song on your computer 4 months ago
It’s a desktop app for mostly non-technical users, so bundling the runtime is a deliberate tradeoff to reduce setup friction and machine-specific breakage.
That said, an optional “use system environment if available” mode could make sense for advanced users. A PR for that would be welcome, as long as it also handles the real complexity involved: platform differences, Python package compatibility, GPU backends, and missing system/compiler flags.