Keystone

KEYSTONE Precision Metering by Side Key System.

Spectrum & Loudness Analyzer.

Keystone is a spectrum and loudness analyzer built around one idea give you accurate visual information without getting in the way.

No bloat, no unnecessary complexity. Just a clean, fast interface that tells you what your mix is doing.

WHAT IT DOES.

Real-time spectrum analysis in 15, 31 or 62 band modes. Peak and RMS metering. LUFS loudness measurement with momentary, short-term and integrated readings. Mid/Side analysis. Adjustable peak hold. Fully resizable from a small corner panel to a full-width display.

The rendering stays fluid even on dense sessions. CPU footprint is kept minimal by design.

LOUDNESS REFERENCES

Delivery targets selectable directly from the interface no leaving the session.

Streaming YouTube · Spotify · Apple Music · Tidal · Deezer · SoundCloud Broadcast EBU R128 · TV & Radio Cinema Film & Cinematic Custom -14 / -16 / -18 / -23 LUFS + genre presets.

WHO IT'S FOR

Mix engineers who want clean spectral feedback. Mastering engineers checking loudness compliance. Producers who need to read a mix fast without opening a heavy metering suite.

Format

VST3 Windows Standalone — Windows macOS.

Free download. No registration required.

Side Key Audio Tools designed for producers working between technical precision and creative instinct.

https://sidekey.fr/