Bravo Nota — Chord Recognition · Tuner

Three tools, one app

Built for musicians who care about precision.

No course-ware, no gamification, no streaks. Just three tools you actually use, engineered to studio standards.

01 / TRANSCRIBE

Chord Recognition

Drop in a file or hit record. A 170-class neural model returns a timestamped chord timeline.

170 chord classes — maj, min, dim, aug, sus, 6, 7, maj7, m7, dim7, hdim7, m(maj7)

02 / TUNE

Tuner

Chromatic, guitar, violin presets. ±1 cent precision. A4 calibration from 415 to 466 Hz.

±1 cent precision · 415–466 Hz reference

03 / KEEP TIME

Metronome

Sub-1ms drift over hours. 2/4 to 12/8 plus custom. Per-beat accents, background audio.

<1ms drift · 5 click sounds · per-beat accents

Bravo Nota timeline showing detected chords with confidence

01 — Chord Recognition

A timeline you can actually trust.

Run any audio through the on-device model and get back a sorted chord track with confidence scores per segment. Toggle Advanced for a 14-pass TTA ensemble that votes across pitch shifts, tempo stretches, and EQ cuts.

↳ 170-class vocabularyTriads, sixths, sevenths, half-diminished, minor-major7, suspended — not just majors and minors.
↳ File or live recordingDrop an MP3/WAV/M4A from Files, or capture live via the mic. Works offline.
↳ Advanced TTA mode14-pass ensemble: pitch shifts × tempo stretches × EQ cuts. Majority vote. Per-segment agreement score.
↳ On-device, alwaysNo upload. No queue. No server-side cost passed back to you. Audio is processed in memory and discarded.

Live preview

What the timeline produces. Each row is a stable chord segment with start time, duration, and the model's agreement score.

File · jazzy.mp3 · 1:51
83 segments · advanced mode

02 — Tuner

Cent-accurate, instrument-aware.

A YIN-pitch-detection backbone with hysteresis on the display so the needle sits still when the note is stable, instead of dancing for stage cred.

↳ Chromatic, guitar, violin presetsSwitch tuning context to filter notes outside the instrument's range.
↳ ±1 cent precisionSub-cent frequency resolution with stable hold across short detunes.
↳ A4 calibration 415–466 HzFor period instruments, baroque pitch (A=415), or band-specific reference.
↳ Signal level meterVisual dB readout so you know when the mic gain is right before you lock in.

Bravo Nota Tuner screen tuning to E3 with cent meter

03 — Metronome

Won't drift. Won't choke under load.

Built on a sample-accurate audio scheduler instead of timer callbacks. The clicks land on the beat even when the device is under heavy load or backgrounded.

↳ Sub-1ms driftSample-accurate scheduling, not setTimeout. Verified over multi-hour sessions.
↳ 2/4 through 12/8 + customCompound, simple, and arbitrary meter — define your own time signatures.
↳ Per-beat accentsMark any beat as accent, normal, or silent. Build practice patterns per measure.
↳ Background audio + tap tempoKeeps clicking when the screen locks. Tap tempo with smoothing for noisy taps.

— BPM Tap 4× to set

Privacy

Your audio stays on your iPhone.

No analytics. No ads. No microphone audio or imported file ever leaves your device — we don't have a server to send it to.

Read the full privacy policy.

×Zero analytics SDKs.

×Zero advertising trackers.

×No account, no login, no email.

×Audio processed in memory, never written to disk.

×No data sharing — there's nothing to share.

Support

Direct line, no ticket queue.

One person makes this app. If you have a question, a bug, or a feature request, write directly.

Email

[email protected]

Bug reports, requests, anything else. Replies within 48 hours.

FAQ

Read common answers →

Tuning for drop D, why a chord might be wrong, offline behavior, more.