If you’ve ever converted a favorite song to 432 Hz, there’s a question worth asking:
What tuning did that recording actually start at?
Most converters assume the original recording was at 440 Hz, and thus apply the adjustment based on that starting point.
But some recordings sit above it or below it, making the starting point wrong and the entire adjustment misses the desired destination.
That fundamental problem inspired us to turn HZ Detect into more than just a music analyzer. On Windows and Mac, HZ Detect can analyze your entire music library, then calculate the proper conversion for each song, so that every conversion lands exactly like you want it to be.
Why measuring first matters
Imagine a recording tuned to A4 = 442 Hz. Apply the fixed adjustment intended to take 440 Hz down to 432 Hz, and its A4 ends up around 433.96 Hz.
You’ve lowered the pitch, but you haven’t reached 432 Hz.
HZ Detect measures the recording’s tuning before retuning it. That gives it a starting point based on the music itself, rather than an assumption about how it was recorded.
One useful distinction: “432 Hz music” refers to a tuning reference, A4 = 432 Hz. It doesn’t mean every note is 432 Hz. Likewise, HZ Detect’s 528 Hz Solfeggio preset uses A4 = 444 Hz, placing C5 at 528 Hz. The song keeps its melody and relationships between notes.
Your whole music collection
The desktop app can now scan the music folders on your computer and analyze the files in your collection. Instead of checking tracks individually, you can discover which recordings use standard tuning, which use an alternative reference, and which fall somewhere in between.
Then choose your target tuning and convert a song, a batch, or your entire catalog of supported music files. Whether you prefer 432 Hz, a Solfeggio preset, or another available tuning, each conversion starts from the song’s measured reference.
An improved analyzer for files and live music
We’ve also improved the analysis algorithm. You can use HZ Detect with local music files, capture music playing live from another app on your computer, or listen through your microphone.
That lets you investigate both the collection you own and the music you encounter while listening.
Analysis runs on your computer, without uploading your music. Converted files are saved as separate copies, preserving your originals. When a track doesn’t contain enough clear melodic information for a reliable measurement, the app marks it as uncertain rather than guessing.
Conversio
Free to analyze and easy to try
HZ Detect is free to download, and desktop music analysis is 100% free. You can scan your library and use live detection without buying conversion credits.
Once ready to convert, choose 432 Hz or any of the Solfeggio tunings, select the desired output folder and HZ Detect will then save your converted music as WAV or FLAC. Both are lossless formats: WAV provides uncompressed audio, while FLAC keeps file sizes smaller without losing audio quality—giving you flexible options for building a music library in your preferred tuning.
Create an account to get your first five song conversions free. After that, one credit converts one song. Credits never expire and are only used when a conversion succeeds.
The unlimited conversions option include the mobile Pro too! See current pricing.
Start with the music you already love
The desktop apps join the existing HZ Detect mobile apps, web detector, and Chrome extension, adding library analysis and batch conversion to the ways you can explore musical tuning.
You don’t need to replace your favorite artists or rebuild your collection around somebody else’s uploads. Start with a few songs you know well, measure their tuning, and try listening at your preferred reference.
Download HZ Detect for Mac or Windows
I’d love to hear what you discover: does your music collection contain more variation in tuning than you expected?
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