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Free · In the browser · No account
Turn on your microphone and RepoDrum calls every stroke as it lands — perfect, early, or late. Underneath: the 40 PAS rudiments, a real metronome, and spaced repetition that resurfaces what you’re about to forget.
No account. No install. Your pad, your browser.
No mic · No signup · Eight taps
Before you give this page another thirty seconds, prove the idea to yourself. A click plays at 80 BPM. You tap along. The machine tells you the truth about every single tap — the same truth it tells you about every stroke once your mic is on.
Ink frame — inside ±40 ms
Amber frame — early or late, in signed milliseconds
Four clicks to listen, eight taps to score
Spacebar on desktop · tap the pad on touch
anatomy of a stroke — the note approaches; the strike: −12 ms, early; it becomes data: the stroke lands just inside the groove ring; the coach speaks: “you're reaching. let the click come to you.”
anatomy of a stroke
the note approaches
412 ms to the line
the strike
−12 ms · early
every stroke is called as it lands
it becomes data
early lands inside the ring
you're reaching. let the click come to you. this happens live, on every stroke →
The method
Not an infinite content library — a sequence a teacher would actually assign, two weeks at a time, with clear stop conditions so you never practice a mistake.
The Personal Drum Troupe
Unison strikes, grip comfort, even tone. Stop the moment you hear a flam. When every limb sounds like one drummer, you have built the troupe.
Metric Projection
Walk-and-sing drills, off-beat clicks, gap drills. Project the beat instead of reacting to it — the metronome confirms your time, it does not create it.
Real World Options
Singles, doubles, paradiddles, short scripted loops. Rudiments are words; patterns are sentences. Build enough vocabulary to have options in real music.
Self-Evaluation Loop
Record 30 seconds and listen back. One unified thud, or a ka-thunk? Find one specific thing to fix, fix it, record again. This skill is the whole game.
The full library holds all 40 PAS Essential Rudiments Browse the rudiments →
The loop
With your mic on, every hit is judged as it lands — perfect, early, or late, in milliseconds.
Your timing spread, per hand. Watch the left hand drag in real numbers instead of vibes.
SM-2 spaced repetition resurfaces the rudiments about to decay and builds tomorrow’s session from what actually happened today.
…and back to hear. Every session, the loop tightens.
Built by a drummer
I’m learning drums the adult way: a practice pad on the kitchen table and no teacher within earshot. I built RepoDrum because I couldn’t tell whether my singles were clean or I’d just stopped hearing the flams — I wanted a teacher’s ear at home. Nobody endorses it and there are no testimonials, because it’s new; if you use it, you’re early. It’s the practice room I wanted for myself, and it’s free.
— Dustin, RepoDrum