Nighthawk Tube
Meditation oscillator scope
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
One purchase, forever. No subscription, no account, no ads, no network at all. Two tones meet inside a glowing vacuum tube: what you see is exactly what you hear.
Nighthawk Tube is a stereo oscillator meditation instrument.
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.
WAVES — morph each side independently from sine through triangle and saw to pulse; the dials wear their waveforms and colors.
BEAM — place the pair in the stereo field: SPLIT sends one tone to each ear, FUSE sums both into both ears so the beat pulses even on speakers, and ORBIT circles between the two in phase with the rotating scope — at a slow drift, or paced at six breaths a minute.
PRESETS — dial a brainwave band, the diatonic chakra scale, or the Cousto planetary tones. Every preset declares its chakra and cites where its numbers came from.
TIMER — set a 1, 5, 10, 15, 20 or 30 minute session; the sound fades to silence when time is up.
The free version plays 5-minute demo sessions, a few times a day. A single $2.99 purchase unlocks Pro — the full session timer and the preset library, forever.
Headphones recommended. No account, no ads, no data collected.
Ratings & Reviews
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Added presets along with documentation on each frequency in the preset.
The developer, river.io llc, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
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Information
- Seller
- river.io llc
- Size
- 3.6 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
9+
- 9+
- Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Nighthawk Tube Full Version $2.99
- Copyright
- © 2026 river.io llc