TempoKey: BPM Analyzer

Know every song's tempo before you walk on stage. TempoKey analyzes an audio file you already own and returns its BPM in seconds — and it always shows two readings, the primary tempo and its half-time or double-time alternative, because that ambiguity is real in almost every library. You choose the one that matches how you count the song. From there it goes straight into a setlist you can reorder, annotate, and read from the stage. WHAT'S INSIDE • Automatic BPM analysis — Import a local audio file through the Files picker or drag and drop, and an on-device engine returns the tempo: Apple's Music Understanding framework on iOS 27, or the built-in DSP engine on earlier systems. Your audio is never uploaded or copied — it stays on your phone. • Dual reading, by design — Every result shows a primary BPM next to its half-time or double-time alternative, for example "87 · or 174". One tap…