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★★★★★
Average rating on the App Store. Apple doesn't publish how many ratings each star has.
Where this app stands in Vietnam, updated 26 Oct 2026
Top free
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Top paid · All apps and games
#79 –
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+ Expanded support - now works with YouTube, YouTube Music, Apple Music and Spotify websites within Safari + Set your own desired A4 tuning
Safari browser extension that adds a button to YouTube and YouTube Music websites that enable you to select the desired tuning of the music you are streaming. Break free from 440 Hz tuning and choose between any of the following frequency tunings: 174 Hz (Solfeggio) 285 Hz (Solfeggio) 396 Hz (Solfeggio) 417 Hz (Solfeggio) 432 Hz (Verdi Pitch) 528 Hz (Solfeggio) 639 Hz (Solfeggio) 741 Hz (Solfeggio) 852 Hz (Solfeggio) 963 Hz (Solfeggio)