Works with Deezer
Listen to Deezer at 432 Hz — or any Solfeggio frequency
Music ReTuner™ retunes whatever you play on Deezer in your browser, live, from standard 440 Hz to 432 Hz, any Solfeggio frequency (174–963 Hz) or your own A4 reference. Deezer Flow, playlists and albums at 432 Hz or any Solfeggio frequency. No downloads, no converted files, your library untouched.
Try 20 tracks free — no sign-up, no card. Then from a few dollars a month, 7-day money-back guarantee.
How it works on Deezer
- Install Music ReTuner for Chrome, Edge, Brave or Firefox and pin it to your toolbar.
- Switch on “All other sites” in the popup once (Chrome asks for permission a single time), then open deezer.com and press play.
- Pick 432 Hz — or any Solfeggio frequency, or a custom A4 — in the popup. The toolbar badge shows the tuning you're on; it follows you across sites and sessions.
- Open the Deezer web player and switch on "All other sites" in the popup — that's it.
- Works with Deezer Free and Premium accounts in the browser.
- Browser only: it can't change the native Deezer apps on phone or desktop.
What you get
432 Hz, Solfeggio, or your own A4
One click for 432 Hz. All nine Solfeggio frequencies. Custom A4 from 200 to 700 Hz.
Every service, one license
YouTube, YouTube Music, Spotify and Apple Music built in — plus Deezer and any other site with sound via “All other sites”.
Pro engine included
Pitch-perfect mode keeps tempo exactly in place; Binaural beat detunes each ear slightly around your target. Chrome & Edge, every plan.
Patented accuracy, 100% private
Built on granted patents for Solfeggio-frequency retuning. Audio is processed in your browser — nothing is recorded or uploaded.
How It Works
Install & Activate The Extension
Install the extension from the relevant store for Chrome, Brave, Edge or FireFox.
Play Music
Open YouTube, YouTube Music, Apple Music, or Spotify and select any song, then start playing it.
Re-Tune In Real Time
Select the desired tuning frequency from the drop down. As soon as you select it, the song will automatically be re-tuned. Play with it as much as you like until you find the optimal tuning frequency for you!
Testimonials
I'm really glad that this Chrome extension exists. I use it almost daily for YouTube. When you set different frequencies, you can immediately hear a change in pitch with music. It takes a bit of getting used to at first, but after just a few seconds, you don't even notice it anymore — you just feel the effect of the frequency. I don't notice any difference when it comes to voices. Best regards from Germany!
Super easy to install and to use! All the Solfeggio frequencies to choose from. Just clicking through the different frequencies is quick and easy. I can listen to the music how I want to. I highly recommend it. Great extension! Love it!
This is a huge step in healing the world. Thank you for this.
Deezer FAQ
Does this change my Deezer account or library?
No. Music ReTuner only changes the audio you hear in the browser, in real time. Your account, playlists, downloads and subscription with Deezer are exactly as before — turn the extension off and everything plays at standard tuning again.
Which frequencies can I choose?
One-click 432 Hz, all nine Solfeggio frequencies (174, 285, 396, 417, 528, 639, 741, 852 and 963 Hz), or any custom A4 reference between 200 and 700 Hz — for example baroque 415 Hz or 444 Hz.
Does the tempo change too?
With the Standard engine the speed shifts very slightly with the pitch (about 1.8% at 432 Hz), which most listeners never notice. Every paid plan also includes the Pro engine's Pitch-perfect mode (Chrome and Edge), which shifts pitch while keeping the tempo exactly the same — ideal for video.
Is it free to try?
Yes — install and retune your next 20 tracks free, no sign-up and no card. After that, plans start at a few dollars a month with a 7-day money-back guarantee. Safari on iPhone, iPad and Mac is a separate app on the App Store.