Do I need a MIDI keyboard to play Klaviero?

Yes for scored play. Any digital piano, stage piano, synth or controller keyboard with a USB port or MIDI out works, from 25 keys upward. There is an unscored microphone mode for acoustic pianos and a computer-keyboard mode for trying the interface, but the scoring is built for MIDI.

Does Klaviero work on iPad or iPhone?

No. Klaviero reads your keyboard through the Web MIDI API, which no browser on iOS supports, because Apple requires every iOS browser to use Safari's engine. Apple has said it does not plan to implement Web MIDI. There is no workaround.

There is a free tier that needs no card, including pieces across every composer group. Paid monthly, annual and Lifetime Founder plans unlock the full library of 315 pieces.

A rhythm game you play on a real MIDI keyboard

You already own the controller. It has 61 or 88 keys and it is sitting next to your desk.

Klaviero turns it into a game controller without turning the music into a toy. Notes fall down the screen, you play them on your keyboard, and every note gets judged: PERFECT, GREAT, GOOD or MISS. Hit twenty-five in a row and FEVER doubles your score until you drop one. The combo multiplier runs from ×1 to ×6. At the end you get a grade, S down to D, and it is saved against that piece.

The repertoire is not game music. It is 315 classical pieces, 811,562 notes, 24.2 hours of playing, from 27 composers. Bach's Prelude in C is 1,284 notes over 3:46. Liszt's Un Sospiro is 4,144 notes and hits 31.4 notes per second at its densest. Both are in there.

You need a MIDI keyboard and Chrome, Edge, Firefox or Opera on a desktop or laptop. Safari does not support Web MIDI, and neither does any browser on iPhone or iPad, because Apple requires them all to use Safari's engine. Apple has said it does not plan to add it. There is no workaround and we would rather you knew before you signed up than after. Full requirements.

What you need before you start

A MIDI keyboard, connected by USB. Chrome, Edge, Firefox or Opera on a desktop or laptop.

The first time you connect, Chrome will ask permission to use MIDI devices. Say yes. That prompt is Chrome's, not ours, and it has been there since April 2024, when Chrome 124 put the whole Web MIDI API behind it rather than just SysEx.

How the scoring works

Every note has a timing window. Land inside it and you get PERFECT. Land near it and you get GREAT or GOOD. Miss it and the combo resets to zero.

Combo×1 to ×6, climbs as you hold a streak

Feverat 25 consecutive hits, doubles score until you miss

GradeS to D, saved per piece

Practice modethe chart waits for you, score counts ×1

Rhythm modereal time, misses count, score counts ×3

Practice mode is not a lesser mode. It is how you learn the notes. Rhythm mode is where the score means something. You choose per song, along with which hand you play and how many misses restart the piece.

What is in the library

Pieces315, charted with both hands separated

Notes811,562 across the whole library

Music24.2 hours

Composers27, Bach to Debussy

Difficulty5 tiers, one note at a time up to big chords with rapid shifting

You can also drop in your own MIDI file, or an MP3. The MP3 gets transcribed into a playable arrangement in your browser. Nothing is uploaded.

Games that use a MIDI controller, and where this one sits

Most MIDI keyboard games are one of two things. Either they are drum-pad and beat trainers built for producers, or they are hobby projects that do one song.

Klaviero is neither. It is a full classical library with rhythm-game scoring on top, in a browser, with nothing to install. If you want the numbers behind the difficulty tiers, we published them: every chart's note count and peak density is in the measured difficulty ranking.

Start

The free tier includes a piece from every composer group and every mood. No card. You need a MIDI keyboard and one of the four browsers above.

Play now See all 315 pieces