Nighthawk Tube: Binaural

Nighthawk Tube is a stereo oscillator meditation instrument.

One purchase, forever. No subscription, no account, no ads, no analytics and no tracking — the app has no network surface of its own; the only traffic it generates is Google Play's own purchase flow.

Two audio oscillators — one in each ear — meet inside a glowing vacuum tube rendered entirely in particles. Their waveforms pour across the glass floor, sum into a slowly rotating interference drum, and trace a live Lissajous figure in phosphor blue-green. What you see is exactly what you hear: the beat between the two tones embosses the drum, the figure turns with their phase, and a meditation figure deep in the tube shows which chakras the current frequencies traditionally touch.

TUNE — one base frequency, a balance knob to mix the pair, and a BEAT knob that dials the difference tone directly, from a half-hertz shimmer to a 120 Hz snarl. The readout shows the beat and the brainwave band it would entrain: delta, theta, alpha, beta, gamma.

BEAM — not a pan, but a continuous morph between two ways of making a beat. SPLIT sends one tone to each ear, so the beat is constructed centrally and needs headphones. FUSE sums both tones into both ears, so the beat pulses acoustically and survives speakers. ORBIT sweeps between them, crossing fully-fused twice per rotation — optionally paced at six breaths a minute.

PRESETS — dial a brainwave band, the diatonic chakra scale, or the Cousto planetary set. Every preset shows its numbers and cites where they came from; the charts disagree with each other constantly, so each one declares its provenance rather than picking a lineage and asserting it.

WAVES — morph each side independently from sine through triangle and saw to pulse; the dials wear their waveforms and colors.

TIMER — set a 1, 5, 10, 15, 20 or 30 minute session. Start one and the bench clears: controls fade, the scene dims to the figure alone, and a phosphor ring drains around the sit. Completed sessions can be added to Health Connect if you grant the optional permission — write-only, never read back, and never recorded for a session you cancel.

OUT — a master level knob and a mute switch, so you can drop the instrument to silence without losing your voicing.

The free version plays 5-minute demo sessions, a few times a day. A single purchase unlocks Pro — the full session timer and the preset library, forever.

Headphones recommended.