iPhone & iPad · Launching soon

Fills that fit your hands. Timing that can't lie.

An endless supply of new drum fills your hands can actually play — and a MIDI kit that tells you, to the millisecond, whether you nailed them.

  • Free generator
  • No account
  • No ads
  • Works offline
DrumFillGenerator practice screen: a one-bar 16th-note fill shown as colour-coded bars with R, L and K sticking under each step, plus Play, Generate and a 106 BPM tempo control.

You've been playing the same four fills for years.

Fill books run out, YouTube lessons don't fit your kit, and practising alone you can't hear when you rush. DrumFillGenerator fixes all three: fresh ideas on demand, sticking that suits your setup, and honest feedback on every hit.

What it does

Two engines and a library, in one practice app.

The generator

New fills that already fit your hands.

Press Generate and get a brand-new linear fill — one drum at a time, in the classic linear style. The app also works out the sticking, so you never end up with crossed hands or a lunge across the kit.

  • Unlimited fills, written to your time signature and subdivision — multi-bar phrases Premium
  • R / L / K sticking under every note, ready to play
  • Loops cleanly — no stutter when the bar comes round
Rhythmic tracking

Find out if you really played it.

Plug a MIDI e-kit into your iPhone or iPad and play along. Every hit is checked against the grid as you play and marked right on the step you struck — so you see rushing and dragging the moment it happens.

  • On time within ±25 ms, early or late out to 80 ms, a miss beyond that
  • A timeline of every hit, plus a history of each loop
  • Slow it down until the bar is all green, then speed it back up
Pattern card while tracking: the steps just played are outlined in green as on-time hits, with a LISTENING indicator.
Hit timeline: a row of coloured ticks, mostly green with a few amber, red and blue.
On time Early / late Miss Wrong drum
The fill library

200 hand-picked fills, free.

When you want someone else's ideas, there's a library of fills transcribed by hand across rock, metal, funk, Latin, fusion, gospel and more. Generate alternates between new fills and the library, so you get both.

  • 4/4 and 3/4, from quarter notes to triplets
  • Includes fills that switch subdivision mid-bar
  • New fills arrive over the air — no app update needed

And also

Everything else you need to practise.

Human feel

Four playback feels, from Robot to Loose — the audio swings, the grid stays exact.

Grid or sheet music

Read each fill as colour-coded steps, or as a classic five-line drum staff Premium.

Metronome & groove

A click on the downbeat, and a groove bar around the fill so you hear it like a song Premium.

Favorites

Star the fills worth keeping, rename them, and reload them any time.

10 languages

English, Ukrainian, German, Spanish, French, Portuguese, Polish, Czech, Japanese, Chinese.

Private & offline

No account, no sign-in. Everything runs on your device, even in airplane mode.

How it works

Set it up. Generate. Practise. Prove it.

01

Set your grid

Choose 4/4 or 3/4, the note values and the drums you want.

02

Generate

Get a fill with the sticking already worked out. Don't like it? Press again.

03

Practise

Loop it at any tempo with the click — and a groove around it Premium.

04

Prove it

Turn on tracking with your MIDI kit and play until the bar is all green.

Generator Setup screen: time signature 4/4 or 3/4, subdivision from quarter notes to triplets, bar count from 1 to 4, and which drums to include.
∞
Fills the generator can write
±25ms
Window for an on-time hit
200
Curated fills, all free
6
Drum voices
4
Playback feels
10
Languages

Pricing

Free to practise. Premium for more range.

The generator, tracking and all 200 fills are free — nothing is time-limited. Premium adds longer phrases and sheet music.

Free

Everything to start

No account, no ads, no trial clock.

  • Unlimited one-bar fills from the generator
  • Rhythmic tracking with a MIDI kit
  • All 200 curated fills
  • Colour-coded grid with R / L / K sticking
  • Metronome, playback feel, favorites, 10 languages
Premium · subscription

Three unlocks

Monthly or yearly, through the App Store.

  • Multi-bar fills — 2, 3 and 4-bar phrases
  • Sheet music view — the classic five-line drum staff
  • Groove context — a groove bar before and after the fill

Full details on the app page.

FAQ

Questions drummers ask.

Do I need an electronic drum kit?

No. Generating, listening, looping and reading fills all work on their own. A MIDI e-kit or pad is only needed for rhythmic tracking — the part that scores your timing.

Which kits work with tracking?

Any drum kit or pad that sends MIDI over USB-C to your iPhone or iPad. Tracking works on one-bar fills.

Can it listen through the microphone?

Not yet. Microphone tracking for acoustic kits is in development and shows as "Soon" in the app.

Does it work on iPad? Offline?

Yes to both. It runs on iPhone and iPad with iOS 26.5 or later, and everything works without a connection. The network is only used to refresh the fill library and show the subscription screen.

How much does it cost?

The app is free, including the generator, tracking and all 200 curated fills. An optional Premium subscription unlocks multi-bar fills, sheet music and groove context.

When does it launch?

The app is finished and on its way to the App Store. Join the waitlist and we'll send one email the day it's out.

Be first on the kit

Get notified when it ships.

One email when DrumFillGenerator hits the App Store. No spam, no drip campaign — just the launch.