What is a chakra?
The word chakra comes from Sanskrit, meaning wheel or circle. In traditional Indian medicine and yogic practice, the seven chakras are described as centres of energy that correspond to major nerve plexuses and organ systems in the body. Each is associated with a specific emotional and psychological domain: survival and safety, creativity and desire, personal power, love and connection, expression and truth, intuition and clarity, and expanded awareness.
Modern research into the biofield — the measurable electromagnetic field generated by living systems — provides a scientific context for what ancient traditions described intuitively. The heart's electromagnetic field, measured by the HeartMath Institute, extends several feet outside the body. The biofield of the entire body is measurable. The idea that different frequencies interact with different aspects of this field isn't mysticism — it's biophysics.
The seven chakras and their frequencies
Each chakra corresponds to one of the ancient solfeggio frequencies:
Root — 396 Hz — Safety and foundation
The base of the spine. Associated with survival, security, and the felt sense of being grounded. When this centre is blocked, it shows up as chronic anxiety, financial fear, and a pervasive sense that the ground might give way. 396 Hz is the frequency of liberation from fear.
Sacral — 417 Hz — Creativity and flow
Below the navel. Associated with creative energy, desire, and the capacity for change. 417 Hz supports the release of old patterns and the opening of new possibilities.
Solar Plexus — 528 Hz — Confidence and power
The stomach area. Personal power, self-worth, and the ability to act from a place of authority rather than fear. 528 Hz is sometimes called the “miracle tone” — associated in research with DNA repair and transformation.
Heart — 639 Hz — Love and connection
The centre of the chest. The frequency of the heart — connection, harmony, and coherence between thought and feeling. This is the frequency every Harmonic 639 session is built on. Research from the HeartMath Institute shows that the heart generates an electromagnetic field 60 times stronger than the brain's — and that the state of this field affects both the person and the people around them.
Throat — 741 Hz — Expression and truth
The throat. The capacity to speak clearly, express authentically, and live in alignment with what you actually believe. 741 Hz supports clarity of expression and the release of what isn't true.
Third Eye — 852 Hz — Intuition and vision
Between the brows. Inner knowing, pattern recognition, and the capacity to see beyond the immediately obvious. Associated with the capacity to hold a vision of what you want before it exists.
Crown — 963 Hz — Expanded awareness
The top of the head. The frequency associated with the highest states of awareness and the sense of connection to something larger than the individual self.
Why we chose 639 Hz
639 Hz — the heart frequency — is the foundation of everything in Harmonic 639 because coherence starts in the heart. When the heart is in a coherent state, everything else follows: thinking clears, decisions improve, and the other centres become more accessible. You can't force your way into Solar Plexus confidence from a place of Root insecurity. But you can use heart coherence as the foundation and let everything else build from there.
All 168 sessions in Harmonic 639 are tuned to 639 Hz. The seven areas of the app — Worthiness, Confidence, Receiving, Momentum, Manifestation, Attraction, and Success Identity — each correspond to one of the chakras. The heart frequency is the carrier signal. The journey is the direction.
→ Why 639 Hz specifically
→ What heart coherence actually is
→ Explore the seven areas in the app
