Quantic Heartz retunes the music you already listen to from 440 Hz to 432 Hz, live, while it plays. Streaming apps, video apps and your own files keep their tempo, and one tap switches back.

WHAT IT DOES
• Real-time retuning from A=440 to A=432 (−31.8 cents), tempo unchanged
• Works with music and video apps that allow it, such as YouTube, YouTube Music, Deezer and Tidal. A few apps block retuning (at the moment for example Spotify); they keep playing normally and the app tells you
• Live Hz counter: watch the tuning glide from 440.0 to 432.0
• Measured, not assumed: a gold check appears once the retuning is measured on your phone (−31.8 cents)
• Q widget for your home screen: double-tap to switch 432 on or off
• Built-in 432 Hz player for your own music files
• Available in 20 languages

WHY 432 HZ
432 Hz is an alternative concert pitch, the reference frequency for the note A, that some musicians and listeners choose. Some listeners describe it as warmer and softer. Instead of searching for a "432Hz version" of every song or converting files one by one, hear your own library and your favourite apps at 432 Hz, and decide for yourself.

HOW IT WORKS
Android lets an app capture the audio other apps play. Quantic Heartz retunes that audio on your phone and plays it back while the original is muted.
• One-time setup (about a minute): the app guides you through three steps in Android's settings (Developer options, Wireless debugging, a pairing code). This gives Quantic Heartz two Android permissions: to see which app is playing, so exactly that app is retuned, and to start 432 without Android asking every time. Wireless debugging is switched off again afterwards. You can undo the setup any time in the app, and uninstalling removes it too.
• Without the setup you can use the built-in 432 Hz player for your own music files. Retuning other apps needs the setup.
Some apps block audio capture; they keep playing at their normal tuning, never twice. Calls are not retuned.

PRIVACY
Audio is processed only on your phone and is never recorded, stored or sent. While 432 is on, Android shows its standard indicator that audio is being captured. Account and subscription data and optional diagnostic reports are described in our privacy policy: quanticheartz.io/privacy

WHY THE AUDIO PERMISSION
Android requires the audio recording permission for any app that captures playback audio. Quantic Heartz never records you: the microphone is only used when you tap the dictation button in "Report a problem", where Android turns your words into text.

ONE ACCOUNT FOR MAC AND PHONE
Quantic Heartz also runs on the Mac. Already a member? Sign in with the same account.

PLANS
Monthly or yearly, each with a 7-day free trial (you're only charged after the 7 days), or a one-time lifetime purchase. Lifetime means lifetime. Manage or cancel your subscription any time in Google Play.

Quantic Heartz is an audio tool. It is not a medical device and does not diagnose, treat, cure or prevent any medical condition.

Questions or feedback: support@quanticheartz.io