Your fingerboard
Play a piece
Record yourself playing anything. You get feedback on intonation and timing, and you can listen back to each flagged moment. You don't need to enter the music.
In tune within
Beats per bar
Shortest note to time against
One bar of clicks counts you in.
Past performances
Import a drill
Paste a drill from Claude (a code fence around it is fine), or load a .json file. The format is described on the right.
Drill packs
Ready-made rhythm drills for passages from pieces. Adding a pack puts its drills in My drills.
My drills
Reports on other drills
Every drill you finish keeps its last 5 runs. Copy a report and paste it to Claude to talk through what's going wrong.
Drill & report format
Where each note lands (last 20 tries)
Bar = average first landing (left flat, right sharp). % = landings within ±15¢. Consistent bars one side = a habit to fix.
Last 4 weeks
Recent runs
Instant, specific feedback
You improve fastest when you know right away how far off you were and which way. Hearing "something's off" isn't enough.
The needle shows cents sharp or flat. The fingerboard shows roughly how many millimetres to move and in which direction. You also get a warning when you play a wrong note, like F natural instead of F♯.
Scoring the first landing
Real playing gives you no time to fix a note. What counts is where your finger lands before you adjust it.
Each note is scored from the first steady ¼ second you play. In Lock-in mode you then correct the note and hold it in tune, so the last thing you practise is the right spot.
Tightening the target step by step
Mastery learning: pass one level (85% or more) before you tighten the target.
🥉 ±25¢ → 🥈 ±15¢ → 🥇 ±10¢ for each drill. The app suggests the next level for you.
Removing the help over time
Studies of the "guidance hypothesis" show that constant feedback can make you depend on it. Removing it gradually makes the skill stick.
Once you have a medal, turn on Hide fingering (practise remembering where the note is) and Ears first (you only see the needle after you land).
Record yourself and listen back
While you play, your attention is on playing. Listening to a recording afterwards lets you hear what you missed at the time.
The Piece tab records a whole performance and marks the moments worth hearing again. It also finds notes that are consistently sharp or flat, and places where your tempo drifted. Turn those into drills, then record the piece again to see the difference.
Accuracy first, then speed
Speed comes from making small, steady increases once the notes are already clean. Pushing the tempo while notes are still out of tune just practises the mistakes.
Tempo mode plays a metronome. A note only counts if it's in tune and on the beat. The tempo ladder goes up 6% after 3 passed runs in a row, not after one lucky run, and backs off 8% after 2 misses. The coach points out when shifts are making you late.
A path, not a menu
Each skill builds on the ones before it: finger pattern, then position frame, then shift pair, then the full scale. Keys come in the order their positions need: G, A and B♭ fit two octaves in 1st position, C and D need 3rd, E and F need 5th.
Path unlocks a skill once its groundwork is mastered. Mastery means clean runs up and from the top, at the target tempo, with a clean first try on 2 different days. A good session only shows what you can do today; the first try on another day shows what you've kept. Mastered skills come back for review at growing intervals.
Coming down is its own skill
String players play descending passages measurably sharper than ascending ones (Kantorski 1986; Sogin 1989). Going down, each lower finger has to find its spot while the ones above lift.
Every Path skill is scored in both directions, and the ⇣⇡ version starts at the top. The results split your average up and down, and when coming down is weaker, Next up starts you at the top.
Practise the hard part on its own
Break a hard skill into parts, drill the hardest one separately, then put it back in context.
Shift pairs repeat each down-shift on its own, and the guide notes show the classic route (slide the old finger, then drop the new one). From the top then puts the shift back into a scale, starting high so you shift down while you're fresh.
Mixing and spacing your practice
Switching between drills and spreading sessions over several days feels harder at the time, but you remember more.
In Path, "Next up" starts with reviews that are due, in mixed order, then your focus skill in short blocks, then its weakest groundwork. In Free practice, Note Hunt gives you random notes from your positions, picking your weakest notes more often. Short daily sessions build your streak.
Hear the note before you play it
You can only play in tune if you can hear the right note in your head first.
Hear it first plays each note before you play it. The tonic drone helps you hear how each note sounds against the key. Listen for the ring when the tonic, 4th and 5th are in tune.
A 10-minute daily routine
- Tune (30 s): press "Tune from open A" so the app measures against your own tuning.
- Warm up (2 min): one Lock-in run of a drill you already have a medal for, with Hear it first on.
- Main work (4 min): the "Next up" drill. Play slowly, and notice which way each note misses.
- Mix (2 min): Note Hunt in Lock-in mode.
- Test (2 min): the main drill in Flow mode with Hide fingering on. This is the honest test.
Complete 3 runs to fill today's dots. Practise every day to keep your 🔥 streak going.