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ScalerbyPlugin Boutique
 Scaler by Plugin Boutique is a Virtual Instrument and a Virtual Effect Audio Plugin. It functions as a VST Plugin, an Audio Units Plugin and an AAX Plugin.
Scaler Scaler Scaler Scaler
Product Scaler
Developer Plugin Boutique
Price (MSRP)
Type / Tags
Plug-in, App & Soundware Format(s)
UtilityStand-alone utility / application
Operating System Availability
Download Released
Downloads Released
System Requirements
Windows 7 and later (32 and 64-bit compatible)
Downloads Released
System Requirements
OS X 10.7 and later (32 and 64-bit compatible)
Miscellaneous Information
Copy ProtectionKey File
Max. 6 items
Latest Version Changes [view all]


Scaler is a unique and inspirational MIDI effect that makes finding chords and progressions intuitive and fun. With note detection, scale selection and chord suggestions, Scaler is a comprehensive but easy-to-use toolbox that will help anyone make better music.

A first of its kind, Scaler can determine what key and scale you're in and suggest chords that match your music, or it can inspire a tune from scratch by providing a set of initial chords in an unexplored key. With the onboard bank of 1,728 scales and modes including genre and artist presets, there's more than enough to keep the juices flowing.

Once you've determined a scale, Scaler lays out basic diatonic chords for you to audition, and lets you take things further with dozens of chord variations and voicings to try out. Theory buffs can also get an insight into each chord's harmonic function.

Ready to put together a progression? Simply drag and drop chords into Scaler's sequencer, change up octaves and inversions, and record or drag the progression into your DAW.


  • Discover your music's key and explore alternative scales and chord sets.
  • Choose from hundreds of keys, and get the harmonic flavours of pro artists.
  • Easily audition chords and find alternative voicings and common substitutions.
  • Quickly build intelligent progressions by dragging chords into Scaler's chord sequencer.
  • Drag chords and progressions from anywhere in the plugin out to your DAW.


  • Discover your track's current scale with MIDI keyboard or piano roll note detection.
  • Get an insight into the emotional content of matching scales.
  • 12 keys across 12 scales and modes giving you a total of 144 options to choose from.
  • 12 unique voicing types giving you a potential 1,728 Scales and modes.
  • Over 50 artist chord sets from the likes of Carl Cox, MJ Cole, CeCe Rogers and Mike Huckaby.
  • Over 50 genre and mood-based chord sets such as Chill, Drum & Bass, Jazz, Soundtrack, EDM...
  • Check how closely a given scale matches your detected input.
  • Keep an eye on notes and chords going through Scaler with real-time visual feedback.
  • Visualise the chosen scale as highlighted notes on Scaler's piano keyboard.
  • Audition chords from your chosen scale with a choice of four sounds.
  • Play and record one-finger chords using Scaler's Bind MIDI function.
  • Assign any VST / AU instrument to Scaler to control your favourite synths.


  • See the basic diatonic chords that can be built from your chosen scale.
  • Browse Chord Variations for each note to get suspended chords, extended chords, dominant sevenths and jazz chords.
  • Quickly get a sense of each chord's harmonic function in progressions.
  • Discover chord substitutions that lend variety to your progressions.
  • Experiment with different chord voicings to spread notes across the keyboard.
  • Mix and match from hundreds of artist and genre-based chord sets.


  • Drag and drop chords from your palette into Scaler's Progression Builder.
  • Transpose and invert chords for even more voicing styles.
  • Audition your progressions and make changes with drag-and-drop.
  • Save your own chord sets to the preset bank for later use.
  • Export MIDI to your DAW simply by dragging and dropping.

System Requirements


  • OS X 10.7 and later (32 and 64-bit compatible).

Formats: :

  • AAX.
  • Audio Units (AU).
  • VST.


  • Windows 7 and later (32 and 64-bit compatible).

Formats: :

  • AAX.
  • VST.
Latest User Reviews Average user rating of 4.00 from 1 review

Reviewed By mtelesha
August 23, 2018

I have gone from a skeptical person of all the "skip music theory cheating apps" to finding Scaler makes me a better musician. Main use is to see what chord I am playing and make sure it actually is an 11th with a 5b. I also like lining up my chord progressions and then playing around with different fill chords. Sure I do 90% of my playing by well playing, but when I am digging in with Scaler I am expanding what I am playing on the keyboard due to Scaler.

Also makes it super easy to build chords in a DAW quickly. I record 2 tracks with one being the raw MIDI from my controller and the 2nd track is Scaler playing chords to the track. Remind me when I would record bass direct and re-map the bass into an amp later.

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Average user rating of 4.00 from 1 review

Plugin Boutique
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