432, 440, 444: the tuning standards explained

Most modern recordings are referenced to 440 Hz, but some projects target 432 or 444. The problem is that labels are often guessed, not measured.

Here is what those numbers mean:

• 440 Hz: Common modern standard for A4
• 432 Hz: Alternative reference, often claimed but rarely verified
• 444 Hz: Brighter reference sometimes used in orchestral or experimental contexts

Why uploads get mislabeled:

• Pitch shifting is applied without updating metadata
• Uploaders copy labels from other sources
• Platforms do not validate tuning claims

If you care about accuracy, measure first. The hzdetect tool identifies the real reference, including Solfeggio targets, by matching notes against tuning tables.

CTA: Verify at /#detector and retune your own file at /retune.