Welcome, this free online educational application lets you tune instruments, convert audio, and compare tuning systems based on 432 Hz, 528 Hz, and 440 Hz.

Use Google Chrome for best performance.
Click the logo to open the guide.

Use is limited to personal, educational, and non-commercial purposes. All tunings belong to their respective authors and are presented for study only. By continuing, you agree to the Terms of Use and License.

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