Estimate music tempo (BPM) and major/minor key from live audio or imported files. Audio is processed on your device and never uploaded. Includes offline analysis, waveform, playback, confidence and half/double beat controls. No account required. English interface with optional Tapsell banner ads. Wired or Bluetooth devices must provide an Android recording input. Noise, weak beats and changing keys can cause incorrect or ambiguous estimates. Iranian dastgah and microtonal scales are not detected. Keep Tempo open while listening. Privacy: https://tempo.erfouni.ir/privacy.html