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Scaler 2

Chord Generator Plugin by Plugin Boutique
£59 / $59
Favorite Utility - Best Audio and MIDI Software - KVR Audio Readers' Choice Awards 2023
Scaler 2 by Plugin Boutique is a Virtual Instrument and a Virtual Effect Audio Plugin for macOS and Windows. It functions as a VST Plugin, an Audio Units Plugin, a VST 3 Plugin and an AAX Plugin.
Windows 7 and later
64-bit compatible only
OS X 10.8 and later (macOS Monterey compatible)
64-bit compatible only

Apple M1 Mac compatibility: Scaler is compatible with M1 machines natively and under Rosetta, we recommend using Rosetta for better stability. For more information, find out how to start Logic using Rosetta.
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My KVR - Groups, Versions, & More
551 KVR members have added Scaler 2 to 433 My KVR groups 662 times.
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+433 in private groups

KVR Rank

Overall: 425   335   419

30-Day: 335; 7-Day: 252; Yesterday: 333

Empower the Composer Within

Scaler 2 is an inspirational and powerful music theory workstation that gives you access to a world of new ideas, expressions and melodies. With powerful detection of MIDI and audio, Scaler 2 can determine what key and scale you're in and suggest chords that match your music. The plugin helps you discover the perfect melody with performance expressions, and can even suggest ways to change from one key to another.

Scaler 2 makes finding chords and progressions intuitive and fun! It's a comprehensive but easy-to-use toolbox that will help anyone make better music.


  • Discover your music's key and explore alternative scales, modes and chord sets.
  • Choose from hundreds of keys and modes, quickly build progressions in the sequencer.
  • Play melodic expressions, phrases, performances, sequences, basslines, melodies and rhythms written by professional musicians across various time signatures.
  • Establish your musical key and scale with audio detection as well as MIDI detection.
  • Create unique chords by searching & selecting from the circle of fifths or by entering note by note on your keyboard in Chord Create / Editor mode.
  • Chord Charts displays a guitar chord diagram for any chord and Fretboard Views allows you to explore the neck of your guitar.
  • Suggest Mode helps you add complexity and artistry to your chord progressions.
  • Discover chord substitutions that lend variety to your progressions and browse chord variations to get suspended, extended, dominant sevenths and jazz chords.
  • Experiment with Voice Grouping to spread notes across the keyboard and keep your chords within a certain range for voice leading.
  • Keys Lock helps you create emotive melodies by locking keys to your chords.
  • Modulation suggestions give you new ways to reach musical destinations.
  • Export MIDI to your DAW simply by dragging and dropping.
  • MIDI Capture lets you perform inside Scaler 2 and then export the results as MIDI.
  • Assign any VST / AU instrument to Scaler 2 to control your favourite synths or use over 45 internal electronic, acoustic and orchestral sounds.
  • Play and record one-finger chords and melodies using Scaler 2's Bind MIDI function.
  • Generate bass lines adapted to your current scale and chords with Bass Mode.
  • Generate melody lines adapted to your current scale and chords with Melody Mode and Sequence Mode.
  • Change keys, performances, melodies and basslines on the fly by MIDI Mapping to your computer keyboard or MIDI Controller.
  • Get more natural-sounding melodies and expressions with the humanise and quantise function.
  • Navigate between modes and pages using keyboard commands or UI buttons.
  • Edit Modes for adjusting length, velocity, inversion, octave, timing and performances more per chord in a pattern.
  • Pad View helps you to arrange and play through multiple patterns and key switch between them.
  • Audition new progressions in context with DAW Sync playback and Auto Play.
  • Use the arpeggio or strum features to perform in real-time and synced to your DAW.
  • Chord editing and moving tools include lasso, drag n drop, replace and insert.
  • Sync multiple instances of Scaler to create a full track. Change one chord in the sync 'leader' and the all Scalers in sync 'follow' mode will respond.
  • Multi Voice Output (Multi MIDI Out) allows you to split each note of chords onto separate channels for complex arrangements.
  • Chords can be played as passages which turns chords into subtle movements and grooves.


  • Over 200 artist chord sets from the likes of Carl Cox, MJ Cole, The Temper Trap, Mitekiss, CeCe Rogers and Mike Huckaby.
  • Over 400 unique genre, common and mood-based chord sets such as Chill, Drum & Bass, Jazz, Cinematic, EDM, Metal.
  • Over 600 chord sets and hundreds of unique scales.
  • Over 500 phrases, performances, sequences, basslines, melodies and rhythms by professional musicians across various time signatures.
  • 45 internal electronic, acoustic and orchestral instruments created by award-winning producers.
  • Over one hundred artist created modulation pathways to get you from one key to another.
  • Over one hundred chord substitutions that lend variety to your progressions.

Latest User Reviews

Average user rating of 4.50 from 2 reviews
Scaler 2

Reviewed By HGC [all]
December 11th, 2020
Version reviewed: 2 on Windows

This plugin is great if you are a beginner in music theory, or want an easy way to implement more complex chords into your production. Great learning tool.

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Scaler 2

Reviewed By mtelesha [all]
August 23rd, 2018
Version reviewed: 1.2 on Windows

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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Comments & Discussion for Plugin Boutique Scaler 2

Discussion: Active
15 July 2022 at 6:45am

Hi all, I made this video review on Scaler, I gotta say that I like it much more than Captain Epic for quick utility to help move the production along quickly. And it has a lot of other useful functions too. I highly recommend it.


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