Binaural Harmonic Beats
Precise brainwave entrainment. Five bands from Delta to Gamma. One purchase, no subscription.
While similar apps charge €7–15/month, Binaural Harmonic Beats is a one-time €2.49 purchase.
Android only · One-time purchase · Stereo headphones required
The five brainwave bands the app generates
Delta
(0.9 – 4 Hz)
Deep sleep & recovery
Theta
(5 – 7.83 Hz)
Deep meditation & processing
Alpha
(8 – 13 Hz)
Flow state & creativity
Beta
(14 – 27.3 Hz)
Active focus & alertness
Gamma
(33.8 – 50.57 Hz)
Peak performance & insight
How it works
Play two slightly different frequencies: one in each ear. Your brain perceives the difference as a third, rhythmic beat. Your auditory brainstem follows that beat, which is called the frequency-following response. Each band is designed to support a different state, from deep rest to alert focus. In studies the effects are real but modest and vary from person to person, so treat it as support for a state, not a switch.
What you use it for:
- Focus sessions: Beta (14–27.3 Hz) for distraction-free, sustained work. Focus protocol →
- Meditation: Theta, the band most associated with deep meditation, as a steady cue for your practice. Meditation protocol →
- Sleep: Descend from Alpha through Delta to wind down before bed. The evidence for sleep is limited and mixed. Sleep protocol →
- Anxiety: Alpha and Theta, the bands most often tested for anxiety in clinical trials, with modest average benefits. Not a treatment for anxiety disorders. Anxiety protocol →
- More: Stress, ADHD, studying, creativity and more →
Why the frequency difference has to be exact
The beat you hear is the difference between the two tones, so any error in either tone changes the beat. It matters most for slow beats: at a 2 Hz Delta beat, an error of 0.1 Hz is a 5% change. The app is built on Google's Oboe audio library (low-latency C++ architecture with 32-bit floating-point signal processing), so the frequency difference your brain perceives is mathematically accurate, every session.
Subliminal message builder: 100% under your control
Alongside the binaural carrier, you can embed your own affirmations as a subliminal audio layer, written in your own words, saved as named presets, loaded whenever you need them.
Unlike commercial subliminal products, you write and own every word. No pre-loaded messages, no hidden content. Want to verify what you've written? Lower the carrier channels and the affirmations become fully audible.
- Write your affirmations: Type directly in the app, in any language or phrasing.
- Save as presets: Store multiple sets and switch between them by session goal.
- Below the conscious threshold: Calibrated so the subliminal layer is inaudible while binaural carriers play at full volume, but fully audible when you lower them.
- On-device only: No upload, no cloud sync. Your affirmations stay on your phone.
Granular control over every session
Adjust left and right channel volumes independently, dial in the exact Hz difference for your target state, and run timed sessions without manually watching a clock.
- Independent channel control: Adjust left and right volumes separately.
- Frequency targeting: Set the exact Hz difference for your target brainwave state.
- Session timers: Built-in timers so you can close your eyes and let it run.
Switch at any time from settings. No restart required.
"Finally an app that actually generates the frequencies in real time instead of playing pre-recorded files. You can feel the difference."Google Play Store review
Common questions
Do I really need headphones?
Yes. This is the one hard requirement. Binaural beats work by delivering a slightly different frequency to each ear; your brain perceives the difference as a rhythmic beat. Speakers mix both channels before they reach your ears, canceling the effect entirely. Any stereo earbuds work fine.
Is this really a one-time purchase?
Yes. €2.49 once, no subscription, no in-app purchases, no feature unlocks after payment. You get all five bands, the subliminal builder, session timer, and all four visual themes. Everything included with the initial download.
Which band should I start with?
Alpha (10 Hz) is the most accessible starting point: relaxed awareness without drowsiness. Delta (2 Hz) for sleep onset. Beta (18 Hz) for focused analytical work. Theta (6 Hz) for meditation. Gamma (40 Hz) for 20 minutes before a demanding task.
What about the subliminal builder: is it safe?
You write every word. There are no pre-loaded messages, no hidden content. You can verify what's playing by lowering the carrier volume. The affirmations become fully audible. Everything stays on your device, nothing is uploaded.
Available now on Android
One purchase. Every session.
€2.49, no subscription, no recurring charge. Download it once and use it as long as you need it.