Try 639 Player Plus free — no subscription, no commitment. Retune your first 20 songs and experience the harmonizing, connecting resonance of real-time 639hz tuning.

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What is 639hz?
639hz is one of the ancient Solfeggio frequencies, known for its powerful ability to harmonize relationships and deepen human connection. Often called the frequency of connection, it is associated with improving communication, resolving conflict, rebuilding trust, and cultivating compassion. Listeners use it for healing relationships, opening the heart, fostering empathy, and restoring harmony in their personal and professional lives.

What you get when you unlock:
✅ Unlimited real-time 639hz retuning of your entire local music library
✅ No ads — not now, not ever
✅ Zero data collection or tracking
✅ Android Auto support — your retuned music in your car
✅ Background playback — music keeps playing when your screen is off
✅ Sleep timer — set it and drift off to harmonizing frequencies
✅ Custom playlists — organize your library your way
✅ Shuffle, Repeat, and full playback control
✅ Yours forever — no subscription, no hidden fees

Want more frequencies?
Unlock additional Solfeggio frequencies individually or as a complete bundle.

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No third-party SDKs watching your listening habits.
Your music stays yours.

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Download 639 Player Plus free today — 20 retunes on us.