About Isochronic Tones
The Isochronic Oracle is Mindspace's interactive isochronic tone explorer: seven tappable frequency wheels, one for each brainwave band from Epsilon through Lambda. Mindspace (mindspace.music) is a sound wellbeing platform created by composer Rob Hulford, pairing each tone with ambient music, nature soundscapes and solfeggio informed listening to support sleep, focus, relaxation and mindful living.
In summary, each brainwave band — Epsilon, Delta, Theta, Alpha, Beta, Gamma and Lambda — is widely searched and associated in wellness culture with states ranging from deep stillness to peak mental clarity. Isochronic tones pulse on and off at each frequency and play comfortably through any speaker, so every tone can be explored without headphones before choosing how to listen, framed as popular wellness-culture associations rather than clinical claims.
Isochronic Oracle · Epsilon
The Epsilon Range
Epsilon sits below standard delta — the slowest range explored in sound-healing practice, associated with profound stillness rather than everyday listening. Tap any frequency on the wheel, then press play to listen.
Epsilon Frequency Range — All Frequencies (0.1 Hz to 0.4 Hz)
Epsilon sits below standard delta — the slowest range explored in sound-healing practice, associated with profound stillness rather than everyday listening.
0.1 Hz — Epsilon — Wave Period 10.00s
Primarily used for: A sense of whole-body resonance, A felt sense of heart-body coherence, A deep, coherent stillness, Explored in advanced meditation practice.
After 15+ minutes of listening: The lowest edge of epsilon sits below what most EEG equipment measures, explored in specialist meditation and sound-healing practice as a slow pulsed tone rather than a mainstream clinical tool. It is associated with a profound sense of stillness — a genuinely exploratory frequency, used by advanced practitioners rather than everyday listening.
0.2 Hz — Epsilon — Wave Period 5.00s
Primarily used for: An ultra-slow, ordered stillness, A sense of deep inner synchrony, Deep extended silence, A sense of complete stillness.
After 15+ minutes of listening: 0.2 Hz is associated in sound-healing practice with deep, extended silence, the pulse slow enough to barely register as rhythm at all. As with the rest of this range, it reflects specialist exploration rather than settled clinical measurement.
0.3 Hz — Epsilon — Wave Period 3.33s
Primarily used for: Explored in deep contemplative states, A sense of suspended stillness, Explored for a sense of ecstatic, mystical oneness, Associated with profound rest.
After 15+ minutes of listening: 0.3 Hz is associated with a settled, grounded quiet, its slow on-off pulse explored in advanced contemplative practice. It sits within the epsilon range popularised in sound-healing circles, below standard clinical EEG classification.
0.4 Hz — Epsilon — Wave Period 2.50s
Primarily used for: Deep meditative absorption, A gentle suspension at the threshold of standard delta, Deep suspended awareness, Explored for out-of-body-like states of awareness.
After 15+ minutes of listening: 0.4 Hz sits at the threshold where epsilon meets standard delta, its pulse associated in practice with the deepest stage of winding down before sleep. It is often used as a bridge frequency — moving from epsilon's profound stillness into delta's more familiar sleep range.
Tap any frequency on the wheel to explore it in full — then press play to listen.
Plays comfortably through any speaker — Bluetooth, laptop or phone. Headphones are optional and can feel intense up close.
Isochronic Oracle · Delta
The Delta Range
Delta is the slowest of the standard EEG bands — associated with deep, dreamless sleep and the body's most restorative states. Tap any frequency on the wheel, then press play to listen.
Delta Frequency Range — All Frequencies (0.5 Hz to 3.5 Hz)
Delta is the slowest of the standard EEG bands — associated with deep, dreamless sleep and the body's most restorative states.
0.5 Hz — Delta — Wave Period 2.00s
Primarily used for: A slow, settled quality of mind, Deep restorative sleep atmosphere, A sense of physical calm, A steadier mood afterward.
After 15+ minutes of listening: The lowest edge of delta is associated in sound-healing practice with easing into sleep, its slow pulse offering something steadier to settle into than silence alone. It is typically used at the very start of a wind-down, as the body begins to let go.
0.75 Hz — Delta — Wave Period 1.33s
Primarily used for: An atmosphere associated with deep processing and rest, Associated with preparing for deep, slow-wave sleep, A calm, settled body, A quieting of mental busyness.
After 15+ minutes of listening: Around 0.75 Hz is associated with the drift between deep relaxation and the first stages of sleep. In practice this steady pulse is often chosen for the transitional minutes before sleep proper, as breathing slows and the body softens.
1 Hz — Delta — Wave Period 1.00s
Primarily used for: Associated with easing into sleep, A relaxed, settled body, A sense of easing stress, A calming presence in the body.
After 15+ minutes of listening: 1 Hz sits in the heart of the delta range most associated in wellness culture with deep, dreamless sleep. Its once-a-second pulse is commonly used for maintaining sleep through the night, played quietly through a speaker across the room.
1.5 Hz — Delta — Wave Period 0.67s
Primarily used for: Pre-sleep drowsiness, A sense of the body settling, A closeness to deep, slow-wave rest, Supports the drift toward sleep.
After 15+ minutes of listening: 1.5 Hz is associated in sound-healing practice with the restorative depth of sleep, where the body is thought to do much of its physical recovery. It is often used during longer overnight sessions aimed at deep, unbroken rest.
2 Hz — Delta — Wave Period 0.50s
Primarily used for: Associated with deep, slow-wave sleep, Easing pre-sleep anxiety, A settled, calm body, Associated with longer, deeper sleep.
After 15+ minutes of listening: 2 Hz is popularly associated with recuperative, repair-focused sleep — the kind of rest sought after physical exertion or during recovery. In practice it is chosen for nights where the goal is restoration rather than simply hours of sleep.
2.5 Hz — Delta — Wave Period 0.40s
Primarily used for: A sense of easing anxiety and physical slowing, A gentle disconnection from outside distraction, A sense of releasing stress, A calmer, more even mood.
After 15+ minutes of listening: 2.5 Hz is associated in wellness culture with a sense of whole-body renewal and calm. It sits toward the upper-middle of delta and is often used as a steady overnight anchor for deep, restorative stillness.
3 Hz — Delta — Wave Period 0.33s
Primarily used for: Associated with supporting slow-wave sleep, Deep physical relaxation, A settled, quiet body, An easier transition into deep sleep.
After 15+ minutes of listening: 3 Hz is associated with a grounded, settled kind of rest, its clearly audible pulse often reached for to quiet an overstimulated nervous system before or during sleep. It is a popular choice for those who find the very lowest frequencies too subtle to notice.
3.5 Hz — Delta — Wave Period 0.29s
Primarily used for: Associated with easing the transition into deeper sleep, A quieting of an overactive mind, A drifting, hypnagogic drowsiness, Deep, undisturbed sleep cycles.
After 15+ minutes of listening: 3.5 Hz sits at the threshold where delta meets theta, its pulse associated in practice with the gentle descent from meditative rest into deeper sleep. It is often used as a bridge frequency — a touch quicker and more present than the deep-delta tones below it.
Tap any frequency on the wheel to explore it in full — then press play to listen.
Plays comfortably through any speaker — Bluetooth, laptop or phone. Headphones are optional and can feel intense up close.
Isochronic Oracle · Theta
The Theta Range
Theta is the band linked in wellness culture to deep meditation, light sleep and vivid dreaming — a slower, more inward state than the everyday waking mind. Tap any frequency on the wheel, then press play to listen.
Theta Frequency Range — All Frequencies (4 Hz to 7.83 Hz)
Theta is the band linked in wellness culture to deep meditation, light sleep and vivid dreaming — a slower, more inward state than the everyday waking mind.
4 Hz — Theta — Wave Period 0.25s
Primarily used for: Deep meditative stillness, Vivid dreaming states, A settled, drifting mind, Gentle emotional release.
After 15+ minutes of listening: The low end of theta is associated in sound-healing practice with the drifting, dreamlike state just before sleep or in deep meditation. Its steady, clearly felt pulse is often used to ease into a longer meditation session or as a bridge toward sleep.
4.5 Hz — Theta — Wave Period 0.22s
Primarily used for: Restorative meditative stillness, Deep inward focus, A quiet, drifting calm, Easing a busy mind.
After 15+ minutes of listening: 4.5 Hz sits deep in the theta range most associated with restorative meditative stillness. In practice it is chosen for longer, uninterrupted meditation sessions where the aim is deep inward focus, the pulse a gentle anchor for attention.
5 Hz — Theta — Wave Period 0.20s
Primarily used for: A relaxed, floating calm, Supporting visualisation, Creative daydreaming, Easing everyday stress.
After 15+ minutes of listening: Around 5 Hz theta is popularly associated with a relaxed, floating calm often described in meditation practice. It is a common choice for guided visualisation or creative work that benefits from a quiet, unfocused mind.
5.5 Hz — Theta — Wave Period 0.18s
Primarily used for: Gentle emotional processing, Supporting inner reflection, A settled, quiet mind, Easing everyday tension.
After 15+ minutes of listening: 5.5 Hz is associated in wellness culture with gentle emotional processing and inner reflection. It is often used during quiet, unstructured time set aside for journaling or simply sitting with one's thoughts, the pulse playing softly in the background.
6 Hz — Theta — Wave Period 0.17s
Primarily used for: Supporting creative flow, Intuitive thinking, A meditative, easy calm, A relaxed, open awareness.
After 15+ minutes of listening: 6 Hz is a popular choice in sound-healing practice for supporting creative flow and intuitive thinking. It sits toward the upper-middle of theta and is often used during creative work or open-ended problem solving, played through a nearby speaker.
6.5 Hz — Theta — Wave Period 0.15s
Primarily used for: A dreamy, reflective calm, Supporting visualisation practice, Easing mental tension, A settled emotional state.
After 15+ minutes of listening: 6.5 Hz is associated with a dreamy, reflective calm, often reached for during visualisation practice or gentle mindfulness work. It is a popular anchor for sessions focused on mental imagery rather than deep sleep.
7 Hz — Theta — Wave Period 0.14s
Primarily used for: Deep relaxation and calm, Supporting meditation and mindfulness, A quiet, spacious mind, Gentle stress relief.
After 15+ minutes of listening: 7 Hz sits toward the upper edge of theta, its pulse associated in practice with deep relaxation and settled, spacious awareness. It is a widely used frequency for general meditation and mindfulness sessions.
7.83 Hz — Theta — Wave Period 0.13s
Primarily used for: Associated with grounding & nature, A calm, centred presence, Supporting meditation practice, A settled, balanced state.
After 15+ minutes of listening: 7.83 Hz is known as the Schumann resonance — the measured frequency of Earth's own electromagnetic field. In wellness culture it is associated with a sense of grounding and natural balance, and is one of the most searched-for tones in meditation practice.
Tap any frequency on the wheel to explore it in full — then press play to listen.
Plays comfortably through any speaker — Bluetooth, laptop or phone. Headphones are optional and can feel intense up close.
Isochronic Oracle · Alpha
The Alpha Range
Alpha is associated in wellness culture with relaxed alertness — the calm, clear-headed state between drowsiness and active concentration. Tap any frequency on the wheel, then press play to listen.
Alpha Frequency Range — All Frequencies (8 Hz to 12 Hz)
Alpha is associated in wellness culture with relaxed alertness — the calm, clear-headed state between drowsiness and active concentration.
8 Hz — Alpha — Wave Period 0.125s
Primarily used for: Deep relaxation with alert calm, Easing into meditation, A calm, clear mind, Quieting mental chatter.
After 15+ minutes of listening: The low end of alpha is associated in wellness culture with the relaxed, half-awake state often reached in light meditation. It is typically used at the start of a session, as the mind settles from everyday busyness into a calmer rhythm.
8.5 Hz — Alpha — Wave Period 0.118s
Primarily used for: A relaxed, easy focus, Supporting light meditation, A settled, calm mood, Easing everyday tension.
After 15+ minutes of listening: 8.5 Hz sits in the range popularly associated with relaxed, unforced attention. In practice it is often chosen for gentle meditation or simply sitting quietly with a settled mind, the pulse audible enough to gently hold attention.
9 Hz — Alpha — Wave Period 0.111s
Primarily used for: Calm, steady alertness, Supporting learning & recall, A clear, unhurried mind, Gentle stress relief.
After 15+ minutes of listening: 9 Hz is associated in sound-healing practice with steady, unhurried alertness — a state often described as calm but switched on. It is a popular choice for quiet reading, studying, or reflective work played through a desk speaker.
9.5 Hz — Alpha — Wave Period 0.105s
Primarily used for: A relaxed readiness to focus, Supporting creative flow, An easy, settled calm, A quiet, present mind.
After 15+ minutes of listening: 9.5 Hz is associated with an easy readiness to focus — relaxed but present. It is often reached for before creative work or tasks that benefit from an unforced, open state of mind.
10 Hz — Alpha — Wave Period 0.100s
Primarily used for: Balanced calm and clarity, Popular for focus & study, A centred, grounded mood, Easing performance nerves.
After 15+ minutes of listening: 10 Hz sits at the heart of the alpha range most associated in wellness culture with balanced, clear-headed calm. It is one of the most widely used frequencies for study, light work, or settling nerves before a focused task.
10.5 Hz — Alpha — Wave Period 0.095s
Primarily used for: Bright, easy alertness, Supporting sustained attention, A calm, confident mind, A steady, even mood.
After 15+ minutes of listening: 10.5 Hz is associated with a brighter, more sustained kind of alertness. In practice it is often used for longer stretches of focused work where steady attention matters more than deep calm.
11 Hz — Alpha — Wave Period 0.091s
Primarily used for: Sharp, relaxed focus, Supporting productivity, A clear, energised calm, A settled sense of readiness.
After 15+ minutes of listening: 11 Hz sits toward the upper edge of alpha, associated with a sharper, more energised kind of relaxed focus. It is a popular choice for tackling a task list or getting into a productive rhythm, playing steadily in the background.
12 Hz — Alpha — Wave Period 0.083s
Primarily used for: The edge of alert focus, Supporting active concentration, A crisp, clear mind, A calm, engaged presence.
After 15+ minutes of listening: 12 Hz sits at the threshold where alpha meets beta, associated in practice with crisp, engaged concentration. It is often used as a bridge frequency — more active and present than the deeper alpha tones below it.
Tap any frequency on the wheel to explore it in full — then press play to listen.
Plays comfortably through any speaker — Bluetooth, laptop or phone. Headphones are optional and can feel intense up close.
Isochronic Oracle · Beta
The Beta Range
Beta is associated in wellness culture with active, engaged thinking — the alert, outward-focused state of everyday problem-solving and productivity. Tap any frequency on the wheel, then press play to listen.
Beta Frequency Range — All Frequencies (14 Hz to 28 Hz)
Beta is associated in wellness culture with active, engaged thinking — the alert, outward-focused state of everyday problem-solving and productivity.
14 Hz — Beta — Wave Period 0.071s
Primarily used for: Active, engaged thinking, Supporting practical problem-solving, A clear, focused mind, Steady mental energy.
After 15+ minutes of listening: The low end of beta is associated in wellness culture with everyday alert thinking — the state most people are in during ordinary focused work. It is often used at the start of a work session, as the mind shifts from rest into active engagement.
16 Hz — Beta — Wave Period 0.063s
Primarily used for: Sharper concentration, Supporting task-switching, An alert, engaged mood, A brisk, clear-headed feel.
After 15+ minutes of listening: 16 Hz sits in the range popularly associated with sharper, more sustained concentration. In practice it is often chosen for tasks that involve moving between several things while staying alert, playing from a nearby speaker.
18 Hz — Beta — Wave Period 0.056s
Primarily used for: Quick, active thinking, Supporting analytical work, A sense of mental readiness, An energised, alert mind.
After 15+ minutes of listening: 18 Hz is associated in sound-healing practice with quick, analytical thinking. It is a popular choice for work that calls for precision and an actively engaged mind.
20 Hz — Beta — Wave Period 0.050s
Primarily used for: Heightened alertness, Supporting fast-paced tasks, A crisp, active mind, A sense of mental momentum.
After 15+ minutes of listening: 20 Hz sits at the heart of the beta range most associated with heightened, fast-paced alertness. It is often used for short, high-output bursts of work where mental momentum matters, its pulse clearly audible and driving.
22 Hz — Beta — Wave Period 0.045s
Primarily used for: Sharp external focus, Supporting high-output work, An alert, driven mood, A sense of urgency and pace.
After 15+ minutes of listening: 22 Hz is associated with sharp, outward-directed focus and a driven sense of pace. In practice it is often reached for during demanding, deadline-style work.
24 Hz — Beta — Wave Period 0.042s
Primarily used for: Peak mental engagement, Supporting demanding tasks, A highly alert mind, A sense of drive and energy.
After 15+ minutes of listening: 24 Hz sits toward the upper range of beta, associated with peak mental engagement and a strong sense of drive. It is a popular choice for the most demanding stretches of a task.
26 Hz — Beta — Wave Period 0.038s
Primarily used for: Intense mental activity, Supporting short bursts of output, A wired, alert feeling, A sense of heightened readiness.
After 15+ minutes of listening: 26 Hz is associated with intense, wired alertness — best suited to short bursts rather than sustained use. It is often used briefly, ahead of a task requiring peak readiness.
28 Hz — Beta — Wave Period 0.036s
Primarily used for: The outer edge of beta, Associated with peak alertness, A highly active, engaged mind, A sense of sharp, focused energy.
After 15+ minutes of listening: 28 Hz sits at the threshold where beta meets gamma, associated in practice with the sharpest, most active end of everyday alertness. It is often used as a bridge frequency — more intense and energised than the beta tones below it.
Tap any frequency on the wheel to explore it in full — then press play to listen.
Plays comfortably through any speaker — Bluetooth, laptop or phone. Headphones are optional and can feel intense up close.
Isochronic Oracle · Gamma
The Gamma Range
Gamma is associated in wellness culture with peak mental clarity — the vivid, "locked-in" feeling of full engagement and sharp present-moment focus. Tap any frequency on the wheel, then press play to listen.
Gamma Frequency Range — All Frequencies (30 Hz to 50 Hz)
Gamma is associated in wellness culture with peak mental clarity — the vivid, "locked-in" feeling of full engagement and sharp present-moment focus.
30 Hz — Gamma — Wave Period 0.033s
Primarily used for: A sense of heightened clarity, Supporting peak concentration, An alert, present mind, Quick mental processing.
After 15+ minutes of listening: The low end of gamma is associated in wellness culture with a heightened sense of clarity — sharper and more present than ordinary focus. It is often used at the start of a session aimed at deep, engaged work.
32 Hz — Gamma — Wave Period 0.031s
Primarily used for: Supporting a flow-state feel, A sharp, focused mind, Quick, connected thinking, A sense of mental lock-in.
After 15+ minutes of listening: 32 Hz sits in the range popularly associated with the "locked-in" feeling often described in flow states. In practice it is chosen for tasks that reward sustained, connected concentration, its rapid pulse felt as much as heard.
35 Hz — Gamma — Wave Period 0.029s
Primarily used for: Heightened sensory awareness, Supporting complex problem-solving, A bright, engaged mind, A sense of mental integration.
After 15+ minutes of listening: 35 Hz is associated in sound-healing practice with a bright, integrated quality of attention. It is a popular choice for complex or multi-part problem-solving.
38 Hz — Gamma — Wave Period 0.026s
Primarily used for: A sense of insight and clarity, Supporting deep concentration, An alert, expansive mind, Quick pattern recognition.
After 15+ minutes of listening: 38 Hz sits toward the middle of gamma, associated with moments of insight and quick pattern recognition. It is often used during deep, uninterrupted concentration, playing steadily in the background.
40 Hz — Gamma — Wave Period 0.025s
Primarily used for: Associated with peak cognitive processing, Popular for deep focus work, A sharp, unified mind, A sense of heightened awareness.
After 15+ minutes of listening: 40 Hz is one of the most widely referenced gamma frequencies in wellness culture, associated with peak cognitive processing and a sharp, unified sense of focus. It is a popular anchor for demanding deep-work sessions.
44 Hz — Gamma — Wave Period 0.023s
Primarily used for: Supporting sustained peak focus, A bright, energised mind, A sense of mental sharpness, Quick, fluid thinking.
After 15+ minutes of listening: 44 Hz is associated with sustained, energised focus — a bright and fluid quality of thought. In practice it is often used for longer stretches of high-level work.
46 Hz — Gamma — Wave Period 0.022s
Primarily used for: A sense of expanded awareness, Supporting intense concentration, A vivid, alert mind, A feeling of mental flow.
After 15+ minutes of listening: 46 Hz sits toward the upper edge of gamma, associated with a vivid, expanded quality of awareness. It is a popular choice for short, intensely focused bursts of work.
50 Hz — Gamma — Wave Period 0.020s
Primarily used for: The outer edge of gamma, Associated with peak mental performance, A highly vivid, alert mind, A sense of complete present-moment focus.
After 15+ minutes of listening: 50 Hz sits at the very top of the gamma range covered here, associated in wellness culture with the most vivid, fully engaged end of mental performance. It is often used as a bridge frequency — brighter and more intense than the gamma tones below it.
Tap any frequency on the wheel to explore it in full — then press play to listen.
Plays comfortably through any speaker — Bluetooth, laptop or phone. Headphones are optional and can feel intense up close.
Isochronic Oracle · Lambda
The Lambda Range
Lambda is a term popularised in sound-healing practice by Dr. Jeffrey D. Thompson's work, sitting above standard clinical EEG bands. It is associated in sound-healing culture with heightened presence and expanded awareness. Tap any frequency on the wheel, then press play to listen.
Lambda Frequency Range — All Frequencies (100 Hz to 200 Hz)
Lambda is a term popularised in sound-healing practice by Dr. Jeffrey D. Thompson's work, sitting above standard clinical EEG bands. It is associated in sound-healing culture with heightened presence and expanded awareness.
100 Hz — Lambda — Wave Period 0.0100s
Primarily used for: A sense of heightened presence, Explored for deep focus in sound-healing practice, A crisp, elevated mood, Associated with expanded awareness.
After 15+ minutes of listening: 100 Hz sits at the entry point of the range popularised by sound-healing pioneer Dr. Jeffrey D. Thompson, sometimes referred to as "Lambda" outside standard clinical EEG terminology. In sound-healing practice its rapid pulse is associated with a heightened, elevated sense of presence.
133 Hz — Lambda — Wave Period 0.0075s
Primarily used for: A feeling of expansive clarity, Popular in sound-healing circles for meditation, A vivid, awake mind, A sense of heightened perception.
After 15+ minutes of listening: 133 Hz is explored in sound-healing circles for its association with expansive clarity and vivid, awake awareness. It sits within Thompson's higher-frequency framework rather than standard clinical EEG classification.
166 Hz — Lambda — Wave Period 0.0060s
Primarily used for: Associated with peak present-moment awareness, Explored for deep meditative states, A bright, unified mind, A sense of expanded consciousness.
After 15+ minutes of listening: 166 Hz is associated in sound-healing practice with a sense of unified, peak present-moment awareness. As with the rest of this range, it reflects popular sound-healing terminology rather than settled clinical science.
200 Hz — Lambda — Wave Period 0.0050s
Primarily used for: The outer edge of the range explored here, Associated with profound stillness in sound-healing practice, A highly vivid, awake mind, A sense of complete presence.
After 15+ minutes of listening: 200 Hz sits at the very top of the range explored here, associated in sound-healing culture with a profound sense of stillness and complete presence. It marks the outer edge of Dr. Jeffrey D. Thompson's higher-frequency framework, popular in sound-healing practice rather than standard clinical EEG.
Tap any frequency on the wheel to explore it in full — then press play to listen.
Plays comfortably through any speaker — Bluetooth, laptop or phone. Headphones are optional and can feel intense up close.
Before You Begin
Setting Up for Sound
A complete setup, one step at a time. Scroll to move through it.
Know your state
Wired, calm, drowsy or irritated — the state your nervous system is in tonight shapes everything that follows.
Choose your frequency
Theta to bridge an active mind towards sleep, or delta once you are already settling. Match it to where you are, not where you want to be.
Any speaker works
Unlike binaural beats, isochronic tones don't need separate ears — a single speaker carries the full effect. A Bluetooth speaker, laptop, or phone speaker all work well.
Headphones are optional
Feel free to use them if you prefer, but the pulsing on-off rhythm can feel intense right up against the ear. Most people find a speaker a few feet away more comfortable.
Set a low, comfortable volume
The sound should sit gently in the background, never demanding your attention.
Set a timer, if your app has one
Useful if you would rather the sound fade out naturally than play through the night.
Choose your layer
Add nature sounds if that feels more comfortable, a full soundscape for something richer, or keep it as a pure isochronic tone for full potency.
Comfort Matters As Much As Frequency
How to Listen for Best Results
Tap any card to reveal why it matters.
✦ The right listening setup should feel easy, comfortable and safe. ✦