
FourThirtyTwo
Retune audio to 432 Hz
About
This app allows you to retune audio files to a custom reference pitch, such as 432 Hz. You can compare the original and modified sound before saving or sharing the pitch-shifted copy. All processing is done on-device for privacy and performance.
What's New in FourThirtyTwo
2026.002
September 30, 2026
• More accurate Auto-detect, now covering tunings up to about 452 Hz. • Batch import now opens compressed ZIP files. • Select All in the Music picker for batch imports: a whole library, album or artist in one tap. • Select All in the Library, to share, save or delete many tracks at once. • Smoother and easier on the battery, especially with large Music libraries. • Better-sounding MP3 exports: they're now encoded from the original, not from a compressed copy. • FLAC exports now keep artist, album and artwork. • More accurate file-size estimates for FLAC and ALAC. • Clearer messages when a file can't be opened or a tuning can't be detected. • Fixed: artist, album and artwork from MP3 and FLAC files didn't appear after importing. • Fixed: files saved from a batch conversion had no artist, album or artwork. • Fixed: hertz values were cut off instead of rounded (439.9 Hz showed as 439 Hz). • Fixed: connecting headphones could interrupt audio playing in other apps. • Fixed: the Music picker search cleared when switching between Songs, Artists and Albums. • Fixed: converting a batch again could keep files made with the old tuning, or add tracks to the Library twice. • Fixed: opening a new file while another was previewing could keep the old one playing. • Fixed: the app asked for Music access on first launch instead of when you choose Import from Music.
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FAQ
What is FourThirtyTwo used for?
FourThirtyTwo is used to retune audio files to a reference pitch of 432 Hz or any other custom frequency you choose. It allows you to compare the original and retuned sound before creating a pitch-shifted copy.
Does FourThirtyTwo have ads?
No, FourThirtyTwo does not contain any advertisements. The app is designed to be ad-free, ensuring an uninterrupted user experience.
How much does FourThirtyTwo cost?
FourThirtyTwo is a one-time purchase app priced at $6.99. There are no subscriptions or in-app purchases required to unlock its audio tools.
What audio formats can I import into FourThirtyTwo?
You can import common audio formats including MP3, M4A/AAC, WAV, AIFF, CAF, and FLAC, up to 500 MB per selected file. Apple Music subscription tracks are copy-protected and cannot be retuned.
Can I use FourThirtyTwo offline?
Yes, FourThirtyTwo is a native on-device application. All audio processing happens on your iPhone or iPad, so an internet connection is not required for its core functionality.
What devices does FourThirtyTwo support?
FourThirtyTwo is built for iPhone and iPad. It leverages Apple's native audio and interface frameworks for optimal performance on these devices.
How often is FourThirtyTwo updated?
The latest version of FourThirtyTwo is 2026.002, and it was last updated on September 30, 2026. Updates typically focus on performance improvements and new features.
Is FourThirtyTwo suitable for children?
FourThirtyTwo has an age rating of 4+. Its features are designed for users interested in audio manipulation, and it does not contain any content unsuitable for younger audiences.








