Shruti

Live tuner

Sing or play a steady note. The default needle uses the nearest keyboard semitone as a quick landmark; rāga-aware practice compares you to Karunattu's 22-śruti target for the selected swara. Within ±5¢ is performance-ready; ±15¢ is workable.

Tampura drone

Sa = C4 (261.63 Hz)

Four-string tampura — Pa / Ṡa / Sa / Sa (octave below). The audio is server-rendered then looped seamlessly in your browser.

Pitch (server-detected via YIN)

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Quick cents from keyboard landmark

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Pick a rāga in practice to grade against its 22-śruti swara.

Mic stays on this device. Audio frames are sent to the server for pitch detection; nothing is stored.

How this works

Your microphone captures ~93 ms frames at 44.1 kHz. Each frame is posted to /api/pitch-detect, which runs YIN (difference function + CMNDF + parabolic interpolation) on the server and returns the fundamental in Hz plus a cents offset. Without a selected rāga, that offset is from the nearest keyboard semitone so you can orient quickly. When a rāga context is present, the tuner reports drift from the swara's 22-śruti position instead.

The pitch-detection algorithm itself lives behind the server boundary — only the result rides the network. The same approach gates the raga grammar and synthesis engines.

Tuner — Karunattu