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MidiSlayer icon

MidiSlayer

Desktop sight-reading trainer that listens to your MIDI keyboard and marks what you play against real notation, in real time.

Chopin's Fantaisie-Impromptu, both hands, in Wait mode. One of the four pieces playable in the free version; the full library is 69 public-domain scores plus your own MusicXML.

Cost / License

  • Freemium (Pay once)
  • Proprietary

Application type

Platforms

  • Mac  macOS 11 or later. Signed and notarized.
  • Windows
  • Linux  64-bit. AppImage, .deb and .rpm builds.
Arpeggios mode: the chord tones appear on the staff with fingering, you play them in order, and each note lights up as it arrives from the keyboard. Ascending, descending or both, one or two octaves.
Practice mode: Ode to Joy in Wait mode. The score holds on the highlighted note until you play it; the combo meter top right rewards clean runs.
+1
Graded Reading in A minor: one note at a time on the staff in the key context of the grade, marked right or wrong the instant it arrives from the keyboard.
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MidiSlayer information

  • Developed by

    GB flagMonoglyph Ltd

  • Licensing

    Proprietary and Freemium product.

  • Pricing

    One time purchase (perpetual license) that costs $50 + free version with limited functionality.

  • Alternatives

    8 alternatives listed

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  • Supported Languages

    • English

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Audio & Music, Education & Reference

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What is MidiSlayer?

MidiSlayer is a desktop sight-reading trainer for pianists. Plug in a MIDI keyboard and the app compares what you play against engraved notation as you play it, marking each note right or wrong at the moment it arrives.

It has nine training modes: Note Flashcards, Graded Reading on a ladder from Initial to Grade 8, Intervals, Chords, Arpeggios, Scales, Key Signatures, Harmony Compass and Chord Progressions. Practice mode adds a public-domain score library of 69 pieces and loads your own MusicXML files. Wait mode holds the score until you play the right note; Tempo mode keeps the clock running whatever you do.

There are also three arcade games with a daily challenge, and a seven-lesson course that starts at what a staff is and ends where the training modes begin.

The app runs natively on macOS, Windows and Linux. MIDI timing is stamped in a native layer and practice data stays in a local database on the machine. After one online activation it works offline.

The free version includes Note Flashcards in full, the whole reading course, a daily game, the entire score library to browse and listen to, and four pieces playable.

Made by Monoglyph Ltd in the UK. In Early Access since August 2026 and updated regularly.