Published: December 15, 2025 · Last updated: June 2026
Here is a curated, comprehensive list of plugins specifically designed for generating MIDI chords or chord progressions. We focus on tools that output MIDI data (e.g., for drag-and-drop into DAWs), emphasizing harmonic generation, progression building, and related features. The list draws from 2025–2026 reviews and avoids non-plugin tools (e.g., standalone apps or browser-based generators like Hookpad’s Aria or AIVA).
Pricing and availability verified as of June 2026. Check official sites for current info — some of these products change pricing models or discontinue without notice.
We built LucidHarmony because we saw a gap in this space. We’ve done our best to be objective and fair below. Skip to the end to see where we think the gap is.
Contents
Plugins reviewed: Scaler 3 · Captain Chords · ChordJam · Cthulhu · Spacewalk · Chordz · Ripchord · Tonespace · AudioCipher · MIDI Wizard 2.0 · LANDR Composer · InstaComposer 2 · Liquid Music · Fluid Chords · ChordConverter · World Chord Generator · Pentacom ChordBloom · dBdone AI Chords · Harvest Mini
Analysis: Quick picks · So where does that leave LucidHarmony?
Scaler 3 (Plugin Boutique)
Key features: Analyzes MIDI/audio input for key/scale detection; drag-and-drop chord blocks; progression builder with voicings/inversions; multi-track sequencer; genre/mood presets; MIDI export with roman numeral notation; built-in instruments for preview.
Pros: Intuitive for theory novices; vast library (thousands of chords/progressions); seamless DAW integration; evolves ideas into full tracks.
Cons: Steep learning curve for advanced features; can feel overwhelming for quick sketches.
Pricing: $99 (upgrades from Scaler 2 $49) · Platforms: Mac, Windows (AU, VST3, CLAP, AAX)
Captain Chords (Mixed In Key)
Key features: Drag-and-drop progression builder; 500+ presets from hit songs; rhythm/voicing controls; integrates with Captain Melody/Bass for full song sections; real-time MIDI keyboard input; roman numeral system for transposition.
Pros: Excellent for song structure; genre-specific (pop/EDM focus); editable piano roll; promotes efficient workflow.
Cons: Expensive bundle if needing full Captain suite; UI feels dated compared to newer tools.
Pricing: $99 (standalone); $249 (full Epic bundle) · Platforms: Mac, Windows (AU, VST3, AAX)
ChordJam (Audiomodern)
Key features: One-knob chord generation; built-in sequencer for rhythmic patterns; velocity/inversion randomization; scale/chord type selection; groove presets from pop/EDM; MIDI drag-export.
Pros: Fun, experimental UI; quick randomization yields musical results; great for loops and live jamming.
Cons: Randomization can produce “generic” EDM vibes; limited theory depth for classical/jazz.
Pricing: $49 · Platforms: Mac, Windows (AU, VST3)
Cthulhu (Xfer Records)
Key features: Chord memory mode (triggers full chords from single notes); arpeggiator with rhythmic interpretation; preset chord banks; MIDI input remapping for progressions.
Pros: Affordable and lightweight; excels in electronic genres (techno/house); simple for fast chord triggering.
Cons: Dated interface; less focused on full progressions (more arp/chord trigger).
Pricing: $39 · Platforms: Mac, Windows (AU, VST3)
Spacewalk (Higher Plane)
Key features: Evolving ambient MIDI chord progressions; chord editing/locking/swapping; humanized timing/velocity/voicings via sparseness/suspension/deviation controls; smoothness transitions; interval-aware voice-leading; drag-and-drop MIDI export; 7 character presets.
Pros: Innovative for ambient/organic harmony; user-friendly for non-theory users; sustains creative flow without manual editing.
Cons: Niche focus on ambient/electronic (less versatile for other genres); no explicit cons noted.
Pricing: £15 ($19) one-time · Platforms: Mac (AU, VST3)
Chordz (CodeFN42)
Key features: Keyboard-mapped chords (each key triggers a full chord); customizable chord types/voicings; open-source MIDI processor; inversion and octave controls.
Pros: Completely free; builds music theory intuition; lightweight and beginner-friendly.
Cons: Basic feature set; no built-in sequencer or presets; requires MIDI keyboard for best use.
Pricing: Free · Platforms: Mac, Windows (AU, VST3)
Ripchord (Trackbout)
Key features: Preset-based chord triggering (single note = full chord); import/export custom presets; velocity-sensitive; collaborative preset sharing.
Pros: Free and collaborative; simple one-note triggering; great for live performance or quick ideas.
Cons: Limited to preset playback (less generative); no advanced sequencing.
Pricing: Free · Platforms: Mac, Windows (VST3, standalone)
Tonespace (Mucoder)
Key features: Visual chord grid (click notes for chords); 39 chord types/21 scales; smart scale-fitting; MIDI input/output for synths; standalone mode.
Pros: Free with huge library; visual learning tool; stays in-key automatically.
Cons: Grid UI can slow fast workflows; minimal randomization.
Pricing: Free · Platforms: Mac, Windows, Linux (AU, VST3, standalone)
AudioCipher MIDI Vault
Key features: Text-to-chord generation (e.g., lyrics to progressions); scale/chord type/duration controls; inversion/randomization; BPM/triplet support; vault for saving MIDI/audio with tags.
Pros: Unique text input sparks creativity; vertical building on melodies; easy export/editing in DAW.
Cons: Text feature niche (not always musical); no real-time input analysis.
Pricing: $59.99 · Platforms: Mac, Windows (AU, VST3)
MIDI Wizard 2.0 (Unison Audio)
Key features: AI chord/melody generation by genre/key/tempo; piano roll editor; articulation/glide controls; detects existing progressions for matching ideas; synth preview.
Pros: Visually engaging; genre-accurate AI (no internet needed); fun for beat-making.
Cons: Very expensive; AI transparency questionable (may use pre-trained models).
Pricing: $347 (bundle often discounted) · Platforms: Mac, Windows (AU, VST3)
LANDR Composer
Key features: AI mood-based progression generation (e.g., uplifting/dark); MIDI editor for notes/velocity/timing; style presets (trap/EDM/pop); instant drag-export.
Pros: Balances AI speed with manual tweaks; emotionally targeted; modern genre focus.
Cons: AI can feel formulaic; subscription model limits free use.
Pricing: $12/month (or $99/year) · Platforms: Mac, Windows (AU, VST3, AAX)
InstaComposer 2 (W.A. Production)
Key features: AI math/theory-based MIDI generation (5 tracks: chords, melody, etc.); probability/density controls; key/tempo lock; drag to DAW.
Pros: Multi-track output speeds full ideas; adjustable randomness; affordable.
Cons: AI outputs sometimes too “math-y” (less organic); basic UI.
Pricing: $99 (often $39 on sale) · Platforms: Mac, Windows (AU, VST3)
Liquid Music (WaveDNA)
Key features: Shape-drawing for in-key melodies/chords; layer system (key, chords, rhythm); variation/harmony suggestions; preset saving.
Pros: Innovative drawing interface; creates coherent variations; good for non-linear ideas.
Cons: Abstract workflow takes practice; less precise control.
Pricing: $149 · Platforms: Mac, Windows (AU, VST3)
Fluid Chords (Pitch Innovations)
Key features: Intelligent chord bending/pitch shifts; MPE support; preset integration; scale-locked transitions between chords.
Pros: Unique bending effects for expressive MIDI; solves “off-key” issues in progressions.
Cons: Niche (focus on bends over generation); requires MPE hardware for full potential.
Pricing: $99 · Platforms: Mac, Windows (AU, VST3, AAX)
ChordConverter (FeelYourSound)
Key features: Transforms input progressions into arpeggios/basslines/phrases; style presets (jazz/pop); MIDI input/output.
Pros: Automatic variation on existing ideas; lightweight converter tool.
Cons: Dependent on input (not pure generator); limited standalone creation.
Pricing: $49 · Platforms: Mac, Windows (AU, VST3)
World Chord Generator (Mario Nieto)
Key features: Real-time MIDI triggering; 57 scales/modes; voicing/inversion randomization; retrigger for variations.
Pros: Broad scale support for global genres; live-friendly.
Cons: UI feels basic; steep curve for mode selection.
Pricing: $49 · Platforms: Mac, Windows (AU, VST3)
Pentacom ChordBloom
Key features: Split-keyboard control (roots/types via zones); extensions (7ths/9ths); chord memory/recall.
Pros: Intuitive no-theory keyboard mapping; flexible textures.
Cons: Split-zone setup awkward for some; no sequencer.
Pricing: $29 · Platforms: Mac, Windows (AU, VST3)
dBdone AI Chords
Key features: AI key/mood-based progressions; editable voicings; variation generator.
Pros: Quick mood matching; simple export.
Cons: AI lacks depth in complex genres; minimal customization.
Pricing: $49 · Platforms: Mac, Windows (AU, VST3)
Harvest Mini
Key features: Scale-locked randomization for chords/melodies; rhythm tapping; lock/re-roll system.
Pros: Free controlled chaos; natural-feeling output.
Cons: Basic (no advanced theory); limited to scales.
Pricing: Free · Platforms: Mac (AU)
Quick picks
If you’re short on time, here’s who to look at based on what you need:
- Best all-rounder: Scaler 3. Deep feature set, great library, works everywhere. The $99 price tag is justified.
- Best for ambient/cinematic: Spacewalk. Purpose-built for evolving, organic harmony. Cheap too.
- Best free option: Ripchord (chord triggering), Tonespace (visual learning), or Chordz (keyboard mapping).
- Best for EDM/pop production: Captain Chords or ChordJam. Genre presets, quick iteration.
- Best for live performance: Cthulhu or Ripchord. Single-note triggering, lightweight.
- Best for full song sketching: InstaComposer 2. Multi-track output (chords + melody + bass) in one click.
- Most unique workflow: AudioCipher (text-to-chord), Liquid Music (shape-drawing), or Fluid Chords (pitch bending).
So where does that leave LucidHarmony?
None of these plugins do what LucidHarmony does.
Most chord generators work from presets, genre templates, or simple randomization within a scale. They give you chords that are correct — diatonic, in-key, structurally valid. But they don’t give you chords that are interesting in the way a trained composer’s ear would find interesting.
LucidHarmony’s approach is fundamentally different. We trained a transformer neural network on 3,700+ compositions from Bach, Palestrina, Monteverdi, Corelli, and Trecento-era composers — not on pop progressions or genre templates. The model learned harmonic grammar from centuries of practice: how tension builds and resolves, when a borrowed chord surprises without jarring, why a particular voice-leading choice feels inevitable in retrospect.
The result is a generator that produces harmonies with real depth. Not random, not formulaic — genuinely musical progressions that reward repeated listening. You don’t need to know any theory to use it. Click Generate, drag the MIDI to your DAW, assign an instrument. That’s it.
What we intentionally leave out: arpeggiators, audio analysis, genre presets, built-in instruments. Your DAW already does those things. We focused entirely on the one thing no other plugin does — deep harmonic intelligence from the masters, running in real-time on your machine.