Music-reactive flashlightSoonDiscoTorch
Turn music into light.
DiscoTorch turns your phone's flashlight into a real music visualizer. Point it at a room, start Beat Sync, and it listens through your microphone, runs the incoming audio through an on-device FFT and adaptive beat detector, and fires the torch on every real onset it finds — not a fixed blink rate. Bass Pulse and Volume Reactive key off low-end energy and overall loudness instead of individual beats, and Strobe is a manual, safety-gated fixed-rate mode for when you just want a strobe. The beat detection itself never needs a network connection or an account — the App is ad-supported, which is the only reason it talks to the network at all.
How it works
Pick a mode — Beat Sync, Bass Pulse, Volume Reactive, or manual Strobe.
Hold your phone near the music (through a speaker, not headphones) and let it listen.
The flashlight fires in real time as DiscoTorch detects beats, bass hits, or loudness — entirely on-device.
Why people try DiscoTorch
Real beat detection, not a blink timer
An on-device FFT and adaptive threshold pick out real onsets from your room's own audio — an eighth-note hi-hat pattern reads as one, not a fixed pulse.
Four modes, one flashlight
Beat Sync, Bass Pulse, and Volume Reactive each key off a different signal in the music; Strobe is a manual, fixed-rate mode for when you just want a strobe.
Real brightness control where hardware allows
On devices that support it, a brightness ceiling scales how hard each flash hits — a loud beat flashes brighter than a quiet one, never faked with rapid pulsing.
A hard safety ceiling on flash rate
Flashing is capped at 10 times per second and Strobe sits behind an explicit acknowledgement, keeping the app below the band most associated with photosensitive seizure risk.
Your flashlight, on the beat.
No account, no data leaving your phone beyond what powers the ads — your microphone audio is analyzed live and never recorded.