Record a real room with a phone and two small sensors, then replay the moment in 3D. You can pause, rewind, and fly the camera anywhere inside the memory, like a video game replay of real life.

Everyone who's played Minecraft knows Replay Mod. You record a session, then scrub through time and fly a free camera around the 3D world to relive it from any angle. We asked: what if we could do that with real life? Record a physical space and the people moving through it, then replay the moment in an interactive 3D viewer where you can pause, rewind, and orbit freely. No volumetric video studio, no professional mocap suit. Just an iPhone, two ESP32s, and a laptop. Replay captures a real-world 3D environment and human body motion in real time, then lets you replay it as an interactive 3D scene.