Grand Finale

3D fireworks simulator that syncs to your music — free forever.

Built with OpenAI and Claude by vibe-coder Chris Pirillo, Grand Finale fires 43 real shell types over a waterfront scene with smoke physics and speed-of-sound boom delays, all synced to music loaded from a file or your microphone. Holiday palettes for July 4th, New Year's, and more are baked in; MP4 export, no watermarks, no account required.