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Real-time pitch trace on a piano roll. Use it for free-form ear training or to run vocal exercises against a moving target.

The view

• The piano keyboard on the left shows the pitch range; scale notes are color-coded by degree (Do, Re, Mi…) with solfège labels.
• Your pitch trace draws as a continuous line scrolling left as time advances.
• The vertical playhead on the right marks "now". Drag the canvas to scrub back through history; use the Re-capture button to jump to the playhead.

Controls

• Start / Stop — toggles mic capture and the trace.
• Clear — wipes pitch history.
• Restart (circle-arrow icon) — when an exercise or rolling key is on, restarts from beginning without clearing trace.

Sidebar

• Root note + scale type — your tonal center and mode (Major, Minor, Pentatonic, Blues, Dorian, etc.).
• Root drone — sustained reference tone. Optional Play as chord for triad context.
• Rolling key — automatically advances the root through a range as exercises complete (semitone / whole tone / scale degree steps; ascending or descending).
• Exercise mode — when on, draws target notes ahead of the playhead. Choose from ladders, tonic-return patterns, triads, sevenths, and intervals (semitone through fifth, up and down).
• Show solfège — print Do/Re/Mi labels on the targets.

A clean rotary metronome with subdivisions, accent patterns, tap tempo, skip-pattern training, timed practice sessions, and a mic listen-back mode that tells you how on-beat you actually are.

The dial

• Drag anywhere on the outer ring to change BPM (≈5° per BPM step). Mouse wheel works too.
• Tap inside the inner circle to start/stop.
• Click the BPM number to type a tempo directly. Use the − / + buttons for fine adjustment.
• The outer ring is the bar visualization — one segment per beat (or per subdivision when set higher), filling smoothly as the bar progresses, with a glow on each beat hit. Accent beats render in magenta.
• Tap-tempo pill: tap repeatedly in time and the BPM updates from your tap median.

Sidebar

• Time signature — 2/4 through 12/8.
• Subdivision — quarters, eighths, triplets, sixteenths, sextuplets. Adds quieter sub-clicks within each beat.
• Accent pattern — tap a beat number to cycle regular → accent → silent.
• Click timbre — Woodblock, Click, Beep, or Cowbell (all synthesized).
• Skip pattern — play N bars, then mute for M bars. Practice keeping the beat without the click.

Practice sessions

Toggle Practice mode in the sidebar and set the session and interval lengths (e.g. 10-min session, 1-min intervals). Then on the page:

1. Start session → 5-second countdown, then the metronome begins.
2. A distinct two-tone chime plays at every interval transition.
3. The progress bar fills smoothly through each interval; the time-remaining countdown sits beneath it.
4. Stop ends the session and the metronome. Restart resets and runs the 5-second countdown again. The session auto-completes at the end of the configured duration.

Hears your hits via the mic (drum pad, claps, taps) and plots them against the beat grid in real time. Designed for percussion practice; works with anything percussive.

Setup

1. Toggle Listen back on (under the dial or in the sidebar). Allow mic access when asked.
2. Wear headphones so the metronome's own click doesn't bleed into the mic.
3. Calibrate roundtrip latency once (see below). Default is 12 ms.

What you see

• Vertical ticks — beat positions. Magenta = accent, dashed = silent / skipped bar.
• Subdivision grid — subtle lines between beats: quarter > eighth > sixteenth (always on). Toggle Triplets in the panel header for the 8th-triplet grid (dashed magenta).
• Waveform — what the mic is hearing right now, mirrored above and below the time axis.
• Threshold band — the lighter horizontal band shows your sensitivity threshold; signals poking above it are detected as hits. Higher sensitivity = narrower band.
• Hit dots — your detected hits, color-coded:

• FLAM marker — when two hits land within ~80 ms of each other (typical drum-flam mistake when the sticks aren't perfectly synced), a small yellow dot + "FLAM" label appears at the bottom of the panel.

Stats

• On grid — % of hits within ±35 ms of any grid line (including silent beats — the most important metric for keeping time when the click is muted).
• Click sync — % of hits within ±35 ms of an audible beat. Compares only against the clicks you actually hear.
• Hit rate — fraction of expected beats you registered a hit for.

Calibration

Audio output and mic input have a roundtrip latency that varies per device. Calibration measures it and subtracts it from your stats so an "on the click" hit reads as 0 ms.

1. Open the Latency field in the sidebar's Listen Back section.
2. Click Calibrate. The mic auto-enables (if off), the metronome auto-starts (if stopped), and the detector listens at maximum sensitivity for 5 s.
3. Use speakers, not headphones for calibration — the mic needs to actually hear the metronome.
4. Don't tap anything during the 5 s window. The median delta between scheduled clicks and detected onsets becomes your latency value.
5. You can also type a value manually if you know your setup's latency.

Big interactive, color-coded wheel of all 12 keys. Click any sector to set the tonic — the wheel highlights its three diatonic neighbors (I / IV / V or i / VI / VII) and updates the key-signature staff in the center.

The wheel

• Outer ring — major-key tonics, with the sharp/flat count printed on the rim.
• Middle ring — relative minors.
• Inner ring — leading-tone diminished chord of each major (passive reference).
• Click a sector to switch the active key and hear its tonic chord. Click on the major ring for a major key, the minor ring for a minor key.
• The selected key's diatonic region (I, IV, V across all rings) is outlined in magenta.

Center hub

• Selected key name + treble-clef key signature.
• Seven diatonic chord buttons (I, ii, iii, IV, V, vi, vii°) — click any to play it. On mobile they appear under the wheel.

Sound

• Voicing — Triad or 7th chord.
• Articulation — Block (all notes at once) or Arpeggio (one after another).
• Volume — independent of the metronome's volume.

Theory overlays

Toggle these in the sidebar to make extra harmony obvious:

• Secondary dominants — V/X labels on the chords that resolve into each diatonic chord (e.g. V/ii, V/V).
• Tritone substitutions — ♭II labels on the alternate dominants a tritone away from each V.
• Parallel key — dashed line linking the current tonic to its parallel-mode counterpart (same letter, opposite mode).

A chromatic instrument tuner for guitar, bass, ukulele, and violin — plus a free-form chromatic mode that snaps to the nearest semitone. Pick a tuning preset, play a string, and watch the cents strip lock onto green.

Getting started

1. Pick your instrument in the sidebar (Guitar, Bass 4-string, Bass 5-string, Ukulele, Violin, or Chromatic).
2. Pick a tuning if your instrument supports more than one — Standard, Drop D, Half-step, DADGAD, Open D, Open G, Low-G ukulele, etc.
3. Press Start and allow microphone access when prompted.
4. Pluck an open string. The big note letter shows the closest target; the cents strip shows how far off you are.

Reading the display

• Big note letter — the target string the tuner is matching against. Octave subscript (e.g. D₃) tells you which octave that target is in.
• Color coding — green when you're within ±5¢ ("in tune"), amber when you're within ±15¢ ("close"), red when you're further off.
• Cents strip — −50¢ on the left, +50¢ on the right. The thin emerald band in the middle is the in-tune zone. The colored marker glides as your pitch changes; play steady to settle it.
• String row — each string is a circular pad. The active one gets a colored ring; once you hold a string in tune for about half a second it earns a green check.

Auto vs manual

• Auto-detect (default) — the tuner snaps to whichever string you actually play, by absolute cents distance. Good for running through your strings one by one.
• Manual — tap a string in the row (or toggle the switch in the sidebar) to lock onto a specific target. Useful when a string is detuned more than a semitone off and the auto-snap keeps picking a neighbor.

Reference pitch

A4 defaults to 440 Hz. Use the slider or the chips (440 / 441 / 442 / 443 / 432) to match an orchestra or a baroque ensemble; the slider goes from 415 Hz (early-music pitch) up to 446 Hz.

Chromatic mode

Pick Chromatic as the instrument when you want to tune anything else — a piano, a tin whistle, a kazoo, a singing voice. The string row hides; the tuner snaps to the nearest semitone of the 12-note chromatic scale at the chosen A4 reference.

All audio processing happens in your browser. The mic stream is analyzed locally — nothing is recorded, uploaded, or sent to any server. Your settings (root note, exercise type, BPM, etc.) are stored in your browser's localStorage and never leave your device.