Online MIDI Tools

Check that a keyboard, controller or synth works.

Plug in any MIDI device and see everything it sends, live: notes, velocity, chords, knobs, pedals, pitch bend and MIDI clock. Send test notes back to check the other direction.

• Names the chord you hold, and General MIDI drums on channel 10
• Velocity chart, every CC with its name, clock tempo
• Raw message log with hex bytes, ready to copy

Musical tennis for two.

What you play flies across the court; what reaches you, you play back in time. Play against the robo pianist, a friend on the same keyboard, or anyone online.

• Single player, two players and Clash modes
• Online matches with a link, spectators welcome
• MIDI keyboard or computer keys

Open a .mid file and see it as a piano roll.

Drop in any MIDI file to see every track as a piano roll, listen with real instrument sounds, mute and solo tracks, and change the tempo.

• Piano roll for every track
• Sampled instruments
• Tempo, mute and solo

Your computer keyboard as a MIDI controller.

Play notes into your DAW, synth or any MIDI app from the computer keyboard, mouse or touch screen. With velocity, sustain, pitch bend, a mod wheel and General MIDI program changes.

• Sends to any MIDI output, or plays its own sound
• Pitch bend and mod wheels, sustain pedal, velocity by key position
• MIDI thru: route a hardware keyboard to another port

Play anything and see what chord it is.

Hold a chord on your MIDI keyboard or click it in, and get its name, inversion and the scales it fits, with the notes spelled correctly for the key.

• Inversions and slash chords
• Correct spelling in every key
• Scales that fit

Chord progressions with smooth voice leading.

Pick a key and a style, from pop to film to jazz, and get progressions that sound good, voiced smoothly. Drag the result into your DAW as a MIDI file.

• Styles from classical to EDM
• Smooth voice leading
• Export as .mid

Euclidean rhythms and polyrhythms.

Spread hits evenly over a loop to get tresillo, clave and four-on-the-floor, then layer rings into polyrhythms. Play them out to your drum machine or export MIDI.

• Euclidean rings
• Polyrhythms like 3:2 and 4:3
• MIDI out and .mid export

See inside a MIDI file, byte by byte.

Open a .mid file and hover over any byte to see what it means: headers, tracks, delta times, running status, meta events. The best way to learn the format, and to find out why a file won't play.

• Every byte explained in plain words
• Tempo, time and key signatures, instruments, piano roll
• Finds broken files and says what is wrong

Render MIDI files to WAV or MP3.

Turn a MIDI file into an audio file with real instrument sounds. Choose a sound set, set the tempo and download.

• WAV and MP3
• General MIDI sound sets
• Runs in your browser

Turn a recording into notes.

Record yourself singing or playing, or open an audio file, and get the notes back as MIDI you can edit, with pitch bends.

• Voice and instruments
• Polyphonic detection
• Export as .mid

Send MIDI between computers over the internet.

Join a room and route MIDI between browsers and machines anywhere. Play a friend's synth from your keyboard, or jam across cities.

• Rooms with a link
• Timing kept steady
• Native app for DAWs later

Video lessons with a shared keyboard.

A video call with a piano keyboard built in. The student hears exactly what the teacher plays, as clean notes instead of compressed audio.

• Video and MIDI together
• Both keyboards on screen
• Made for lessons

Visuals that play along with your music.

MIDI-reactive visuals for DJs and VJs. Feed it MIDI from a DAW, drum machine or controller and mix GPU-generated scenes live on two decks, the way you mix tracks. Locks to MIDI clock, and an Auto mode runs the show for you.

• Two decks of 12 shader scenes with a crossfader, color modes and FX
• Follows notes, drums and MIDI clock; MIDI learn for every control
• Separate output window for the projector; Auto, Simple and Pro modes

A composing companion for students and working composers.

Pick a form, from a minuet to a musical number, and build it with harmony suggestions, melody development, counterpoint, orchestration and theatre timing, all on one timeline.

• Harmonise a melody in six styles, chorale to jazz
• Voice leading that avoids parallels
• 54 form templates, sheet music, MusicXML and MIDI export

Your Mac trackpad as a MIDI controller.

Turn the trackpad into an expressive XY controller for your DAW and synths: slide, press and draw to send notes and control changes.

• XY pads and faders
• Multi-touch
• Works with any DAW

Play a phrase and the computer answers.

A duet partner that listens to what you play and answers in your own style. It learns as you play, so the longer you jam, the more it sounds like you.

• Call and response
• Learns from your playing
• MIDI keyboard or computer keys