See what your eyes can't. The phone amplifies imperceptible motion and color changes in real time. Point at a face — watch blood pumping through skin. Point at anything still — see it vibrate.
Two modes:
Pulse — bandpass 0.7–3 Hz · color amplification · sees heartbeat
Tremor — bandpass 5–25 Hz · motion amplification · sees micro-vibration
Based on Eulerian Video Magnification for Revealing Subtle Changes in the World, Wu et al., MIT CSAIL, SIGGRAPH 2012. Phase-based magnification, Wadhwa et al. 2013. No major consumer platform has ever shipped this.