The on-screen keyboard
Played with your finger: the tablet is enough, even on the go.
A domain of the path
White keys and black keys, the groups of two and three, C, then every note, octaves, half steps and whole steps. A voice explains, and you answer on the keyboard.
Completely free, and the tablet is enough: the on-screen keyboard is played with your finger.

What you'll learn
The keyboard is read through its black keys: they come in groups of two and three. C is the white key just to the left of a group of two black keys; F, just to the left of a group of three.
From those two landmarks, you find every white key, first with its name, then without. To the right the sound goes up, to the left it goes down; from one C to the next is an octave.
Then come distances: a half step is the key right next door; a whole step is two half steps. A black key has two names, a sharp and a flat. The last tutorial takes you from the keyboard to the staff, with middle C.
The exercises
In the order the app offers them.
White keys, black keys, groups of two and three, and your first landmark: C.
Interactive tutorials
Find C and F, then every white key, with and without its name.
Interactive tutorials
Rightward goes up, leftward goes down; octaves, and the key right next door.
Interactive tutorials
Half steps, whole steps, sharps and flats: two names for the same black key.
Interactive tutorials
Find a note you were shown, a note you were told, a path — without help.
Interactive tutorials
The keyboard plays, the staff writes: middle C and its first three neighbours.
Interactive tutorials
Each exercise comes in several sequences: “Redo” the same one, or “New sequence” to play another.
What to play on
In Guided mode, the piano waits for you if you slip; in Performance, you play in tempo.
Played with your finger: the tablet is enough, even on the go.
Put the tablet on the music stand: Okyla listens through the microphone, and the sound never leaves the device.
Plugged in over USB, every note is read the moment you play it.
Look for a group of two black keys: C is the white key just to its left. There's one in every octave; middle C is the one near the middle of the keyboard.
No. The tutorials and exercises in this domain are played with your finger, on the on-screen keyboard. A piano or a keyboard can come later.
Because everything else depends on it: to read a note on the staff, you need to know where it is on the keyboard. This domain also teaches the words the app uses afterwards.
Yes, the whole domain, with its exercises. It carries on with the treble clef, whose first chapter is free too.
The path