Your whole music library, analyzed. Then retuned.
Point HZ Detect at your music folders and it measures the real tuning of every song — 440, 432, or any Solfeggio frequency. Library analysis is free and runs entirely on your computer. When you find songs stuck in standard tuning, retune them to the frequency you prefer.
Add your music folders and HZ Detect scans and measures every track — no upload, no cloud, no per-song cost. Results are cached, so your library only analyzes once. 10,000+ songs? One afternoon. Live detection is built in too: point the mic or capture desktop audio.
The analyzer measures each song's note grid against 440, 432, and all nine Solfeggio anchors — and says "Uncertain" rather than guessing when a track has nothing to measure.
Batch analysis with live progress, results remembered forever, and standard-tuned tracks highlighted in red so you know exactly what to retune.
Converters assume every song is 440 Hz. HZ Detect retunes from each song's measured tuning — so a true-432 track retuned to 528 lands exactly on 528, not somewhere nearby. Originals are never modified; retuned copies are written to the folder you choose.
Try it on your library
The detector, library analysis, and tuning labels are free with no limits. Retuning uses conversion credits — new accounts get 5 free conversions, and packs start at $9.99. See the full pricing.
Sign in with your email — no password — and your Pro unlock and conversion credits follow you across desktop and the mobile app. Everything is processed on your device; your music never leaves your computer.
Signed, notarized, and self-updating. macOS 13+ (Apple Silicon & Intel) and Windows 10/11.