How it adapts

It reads what your hands actually did

KeyFu is a piano practice app for iPhone and iPad that plans from what your hands actually played. It fits your goal, your time, your keyboard and your hands today.

What it changes

It moves with how you played

a notch faster · a notch slower · the stuck hand alone

Playing something right once is not the same as owning it.

The tempo picks up when chords land in time and gives you room when they don't. An exercise that held steady can come back a notch faster.

When a spot keeps catching, help comes in steps: a notch slower, the stuck hand alone, then no beat until it runs clean. The coach says what changed.

Fatigue

It eases off when you tire

Late in a session your hands stop responding the way they did at the start.

The Let’s ease off card: your hands have been working hard, and the next one, “Four chords, one 7th each”, is demanding; below it, Take a short break, Swap in 1 – 5 – 6m – 4 block chords, and Continue as planned — Before each exercise: a break, something lighter, or on as planned

KeyFu treats that as information, not failure. Before each exercise it checks how you’re doing; if it’s too much, “Let’s ease off” offers a break or something lighter.

Continue as planned plays it anyway, and Take it easy on my hands in Settings makes sessions lighter, with earlier breaks.

Pick a library exercise that is a bit much today, and it starts at its slowest tempo while the coach says why.

Your time and your keys

It fits your time and your keyboard

5 to 30 minutes · 25 to 88 keys

Today’s session is sized to the minutes you pick, and its exercises stay inside the keys you have.

Change time puts the plan together again for a new length, so nothing is simply cut off the end.

Tell KeyFu your keyboard’s size, from 25 to 88 keys. An exercise that needs more says so, and octave buttons are followed.

Which keyboards work with an iPad or iPhone

The skill chart

Six skills, and the honest gaps

Six skills, each in its own place on the wheel.

Your skills: KeyFu says Timing is leading, Ear is your next win, and your goal leans on Chord moves, Chord shapes and Low notes; the six-part wheel with rings around those three; and the list of all six skills, each with its level in words, how fresh it is and this week’s minutes — Six skills, your goal’s rings, and where this week went

Timing: Staying with the beat, not just near it.
Chord moves: The changes a song is built on.
Ear: Recognizing what you hear before you find it.
Chord shapes: Getting the shape under your fingers.
Hand sync: Both hands landing together.
Low notes: The low part a song stands on, usually played by your left hand.

Three views sit over the same wheel. Level says how far along each skill is, in words; Freshness, how well it is holding; This week, your minutes.

Your goal puts a ring around the skills it leans on. The ring is never part of the fill, so changing your goal takes nothing away.

A skill KeyFu has not measured yet stays an empty outline, and its row says which exercise fills it in. Empty means not measured yet.

Your skills, in the app manual

Where it runs

Practice works without a connection

When a chord is not fully down at the line, the roll waits for you, and that wait happens on the device itself.

The roll waiting at the line: the 6m · Am chord drawn as three hollow gold outlines with finger numbers, the coach’s note that the roll waits quietly for the whole shape, and the keys A, C and E outlined on the keyboard below — The roll waits for the whole chord

It works the same with the Wi-Fi down as with it up, because reading what you played never waits on the internet.

If the coach can’t be reached, practice carries on without him. What matters while your hands are on the keys never depends on a connection.

Pricing

Start free

Core practice stays free.

Free for everyone: the exercise library and its ready-made routines, any exercise you pick, and one session a week planned for you. Setting your own goals stays free forever.

KeyFu Pro plans the right session every time you sit down and lets you build your own routines.

The beta is free, and the beta list gets a discounted first year of KeyFu Pro.

Join the beta

Invitations go out in small waves. KeyFu is free during the beta.

We send one confirmation email, then invitations in small waves. Without the tick we use your address only for the beta and the launch (privacy).

You need an iPhone or iPad and a keyboard that connects by USB or Bluetooth MIDI — most digital pianos do. What one session looks like.