Auto-Key Music key detection for iPhone

App overview

Auto-Key is a free iPhone app from Antares Audio Technologies LLC that quickly identifies the musical key of any audio source. Designed for both studio environments and mobile use, the app listens to a short audio sample and reports the most probable key along with its diatonic scale, making it simple to determine key information on the fly.

Seamless DAW integration

One standout capability is the ability to transmit the detected key to an Auto-Tune session running on a desktop DAW. This synchronization removes manual entry, helping vocal-tuning and pitch-correction workflows remain precise and uninterrupted.

How to get results

• Tap the Auto-Key icon on the home screen to begin a quick analysis.
• Record a few seconds of sound from a speaker, an acoustic instrument, or a voice.
• Review the returned results, which include the likely key and its diatonic equivalent.

Who benefits most

• Music producers and audio engineers who need fast, accurate key data for tuning and arrangement.
• Musicians and performers wanting to verify the key of songs while rehearsing or playing live.
• Home studio users who want an easy method to prep tracks for pitch correction.

Key features at a glance

• Fast key detection from live audio sources.
• Direct key sharing with Auto-Tune on your computer DAW.
• Simple, no-fuss interface that’s accessible to users at any skill level.

Alternative option

If you’re exploring alternatives, eSound — MP3 Music Player Free is a commonly suggested substitute for basic listening and key-reference tasks.