Free to Use

Drum MIDI,
Instantly Generated

Production-ready grooves and fills for any genre — including odd time signatures. Preview, tweak in the built-in editor, then drag MIDI straight into your DAW.

Download for macOS — Free See Features
Deterministic Drums app screenshot

Completely Free Right Now

The current version is fully unlocked — no subscriptions, no account required, no ads. All features, all genres, zero cost. As the project grows, premium features may appear down the line.

× No subscription × No account needed × No ads

Everything You Need to Build Better Drums

From instant generation to fine-grained editing — one app handles it all.

Instant Pattern Generation

Generate grooves and fills in a click. Each generation creates multiple base patterns with 6 deterministic variations each — dozens of unique clips per batch.

11 Genres

Rock, Metal, Djent, Jazz, Electronic, Blues, Hip-Hop, Funk, Reggae, Latin, Pop — curated presets fine-tuned for each style's feel and conventions.

9 Time Signatures, Including Odd Meters

Go beyond 4/4. Full support for odd and compound signatures: 3/4, 5/4, 7/8, 8/8, 9/8, 11/8, 12/8, 13/8 — every pattern generated with correct phrasing for the meter, not just 4/4 with a different bar length.

Drag & Drop to Any DAW

Drag any generated clip directly from the app into your DAW — Ableton, Logic, FL Studio, Reaper, Cubase, or any other. Standard MIDI files, zero friction.

Built-in Drum Editor

Open any pattern in a full grid editor. Toggle steps, adjust velocity with the scroll wheel, add or remove bars, add instruments — then save as a new MIDI clip.

Instant Audio Preview

Listen before you commit. Built-in sampler with real drum sounds lets you preview every generated pattern or edit in real time — no DAW required.

Deep Customization

Control tempo (40–260 BPM), phrase length (1–32 bars), character (tight, aggressive, laid-back, busy), snare beat placement, snare frequency, and which drums to include.

Intelligent Variations

The variation engine applies velocity humanization, ghost notes, accent shifts, kick doubling, hi-hat openings, tom orchestration, and density changes — musically, not randomly.

Generation History

Every generation is saved automatically. Star your favourites, filter by genre or time signature, reload clips, reuse settings, or regenerate with one click.

MIDI Catalogue

Point the app at any folder of existing MIDI files on your machine. Browse, preview, and drag clips from your own library alongside generated patterns — one unified workspace for everything you've collected and everything you create.

Patterns That Actually Sound Right

Each genre uses curated presets matched to its conventions — not generic randomness.

Rock Metal Djent Jazz Electronic Blues Hip-Hop Funk Reggae Latin Pop

From Idea to MIDI in Seconds

1

Pick Your Style

Choose a genre, time signature, tempo, and character. Toggle individual drums on or off.

2

Generate

Hit generate and get a batch of unique grooves and fills — each with multiple variations.

3

Preview & Edit

Listen instantly with the built-in sampler. Open the grid editor to fine-tune any pattern.

4

Drag to DAW

Drag any clip from the app directly into your DAW's timeline. Standard MIDI — works everywhere.

Get Deterministic Drums

Available now for macOS. Windows and Linux builds are in the works.

macOS

DMG · Apple Silicon & Intel

macOS 12 Monterey or later · Apple Silicon & Intel · ~120 MB