Key Finder

Use Everywhere

Available on iPhone, iPad and Mac.

Instant Detection

Detect key in 1 second, even offline.

Lightweight & Fast

Analyze unlimited tracks using batch mode.

Multiple Formats

Use Camelot Wheel or musical notation.

Key Finder detecting musical key instantly from an audio file

Key Finder analyzing multiple tracks in batch mode

	Key Finder	Mixed In Key	Rekordbox
Pricing & Ecosystem
One-Time Purchase Buy once, own forever. No subscription required	$3.99	$58	Free / subscription
One Purchase, All Platforms Mac, iPhone & iPad covered by a single purchase		–	–
Platform Availability
Mac
iPhone		–	–
iPad		–	–
Core Features
Under 1 Second Per Track Results in under a second, on-device		–	–
Batch Mode Analyze your entire library in one session
Write Key to File Embeds detected key into audio file metadata			–
Musical Notation Standard sharps and flats notation

Rated 4.9 out of 5 on the App Store

How fast is the key detection?

Key Finder detects the musical key of any track in under 1 second. The analysis runs entirely on your device, with no upload time or server latency.

Which notation systems are supported?

Key Finder supports Camelot Wheel, standard musical notation (sharps and flats), and Open Key notation. You can switch between them at any time.

Can I analyze multiple tracks at once?

Yes. Batch mode lets you import and analyze your entire music library in one session, with minimal CPU and memory usage so your device stays responsive.

Does it require an internet connection?

No. All key detection happens fully offline, on-device. You can analyze your whole library anywhere, without any connectivity.

Can I save the detected key back to my audio file?

Yes. Key Finder can write the detected key directly into your audio file's metadata, so it shows up in Rekordbox, Serato, Traktor, or any app that reads tags.