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zeptocore

A handmade, handheld sample player.

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Details

zeptocore is an open-source handheld device for playing with samples, designed as a simple, tactile, and immediate tool for shaping sound in real time. it plays stereo 16-bit audio at 44.1 kHz from an sd card, organizing up to 256 samples across 16 banks, and pairs this with a set of built-in effects, a realtime sequencer, and a single-cycle wavetable bass voice. the interface is intentionally minimal and hands-on, encouraging experimentation through modes like jump, mash, and bass, while supporting midi, clock sync, and usb connectivity. powered by two aaa batteries or usb-c and built with a small onboard speaker, it’s meant to be portable, hackable, and fun—something you can pick up and play immediately, but also modify and extend as you like.

Videos

7 videos

Specifications

  • manage audio with zeptocore.com
  • mono or stereo playback of 16-bit (internal 32-bit) audio files @ 44.1 kHz sampling rate
  • SD-card storage for gigabytes of samples, recalling up to 256 audio files across 16 banks
  • powered by two AAA batteries for up to 4 hours or powered by USB-C
  • tempo-synced with a selectable BPM between 60 and 300
  • loaded with 16 real-time effects like timestretching, delay, distortion, fuzz, tapestop, resonant filters, etc.
  • realtime sequencer with optional quantization and performance-oriented controls
  • MIDI (in + out) over USB for syncing with DAWs and external gear
  • sync-compatible with any gear that has a clock input/output signal
  • built-in speaker for portable playback
  • open-source, wonderfully hackable (GitHub)

Customer feedback Reviews 4.9 / 5 68 reviews

rasterkid

fast loud tactile. exactly what i wanted

lisamakesnoise

Built-in speaker sounded like a novelty on paper but I use it constantly. Sit on the couch, load some samples, start chopping. Super immediate little machine.

plasticsnare

nice bit of kit :)

A. Miller

Open source was a huge reason I bought it. The fact that the firmware keeps evolving makes the Zeptocore feel like a living instrument instead of finished hardware.

marrow.fm

zeptocore feels like a sketchbook for drums. really into it

nate404

Honestly the random sequencer + random effects combo feels like having a tiny collaborator in your hand. It keeps throwing out ideas I would never program myself.

ChrisFromLeeds

Love that the sequencer doesn’t force everything into a boring grid. You can record something slightly crooked and it actually keeps the feel.

seasonofdasickness

Honestly, I haven’t used it much. I can tell you that it has a lot of capabilities distorting and mangling samples. And the stereo output sounds really nice. I’m interested in pushing it further. Whenever I break it out I have to have the manual next to me because I haven’t learned the workflow yet.

I haven’t used it enough to have a definitive answer but it’s fun and I’m interested in learning the workflow better and seeing how I can push it further.

risjdowding

Thanks - yes - really enjoying it, just starting to learn all the functions.

risjdowding

Really enjoying playing it - thanks.

Free_Selection9330

Got mine last month ....dope a.f

risjdowding

I made the zeptocore, and I'm really enjoying it.

mxbrady

the retriggering is SO satisfying. hold one pad, hit another, instant rhythmic nonsense. Add reverse or repeat and it gets out of control very quickly :)

Emily R

This is what I want from portable music gear: turn it on, hit buttons, make something strange. No laptop ceremony required.

jwarin

Having everything I loved about Zeptocore in a little virtual box...Christmas came early kind of vibes.

jasonp1978

Was expecting a quirky little sampler. Was not expecting a sequencer, bass mode, MIDI, randomization, timestretch and sixteen fx hiding in there too??

plusbeats

It's fun, but as you write, more of a playback machine than a sampler. Comes with huge library of breaks

Yes

coffeeandcables

Loaded my own drum folders onto the SD card and this thing immediately became ten times more personal. Feels less like a gadget and more like an instrument you grow into.

dontslepiskrueger

hey zach, i love this lil thing!

Dan W.

The MASH mode alone sold me. Being able to throw fuzz, loss, repeat, reverse, tapestop etc. onto a sample without stopping to think is just FUN.

royalbuse

I really love your module and the zeptocore!

sarah_82

tiny speaker, batteries, 256 samples, weird effects everywhere. basically a little pocket chaos machine and i mean that as a compliment

rajateresidentlien

I'm still thoroughly impressed with zeptocore

vaman99

oh yeah, i have the zeptocore and it is an amazing design +function and it works great w/ the pom series (16,170,&400)

jackaevret

Just got the zeptocore and I gotta say it’s amazing.

liot23amaste

Hi Zack, I am really enjoying the Pilocore and Zeptocore, I still have a lot to learn.

MartinK

zeptocore is one of those instruments where you press one button to see what happens... then suddenly an hour is gone. The jump/retrigger stuff is insanely immediate.

akzt

Thx for doing this I got the device yesterday and played a lot with it and love it already :) <3

redy

Your zeptocore is sick

rooftoabotz

Otherwise I love the thing.

sche

Thank you so much for making this awesome project open source, allowing me to make my own instrument out of it.

sche

I just recently came about zeptocore and I must say I am really impressed by it.

lithpop

Thanks for making the zeptocore, It's amazing!

gar3215

Sill love the Zeptocore just trying to figure out how to use it to it's full potential.

ayhsking

I recognize you're a one-person team, and I'm so, so impressed with the idea of Zeptocore, and adore much about the Zeptocade size and layout.

ayhsking

To begin with, I wanted to say I love the sound of the Zeptocore, and love the full-sized design of the Zeptocade, and absolutely love the performance effects so much.

g7

I hope you won't give up on this project, despite you've invented some new cool things (like zeptocore and the other awesome stuff you did).

madaie

I am very impressed with the zeptocore and am going to make a zeptoboard for myself.

elory

The Zeptocore is even more amazing!

borntutelers

Love the zeptocore.

quidsakura

And thanks for these amazing little machines.

quidsakura

I just want to start off by saying I absolutely love my pikocore and my zeptocore.

nen.iwato

Either way you're doing some absolutely amazing work.

nen.iwato

I love the older pocket operators but i always wished for something similar with more customization and features like the Zeptocore has.

osbot

Zeptocore was a lot of fun and seeing you progress on it from here was even more cool!

chad.hornto

I got a zeptocore from you about two months ago, and I’m a big fan of the hardware, the workflow, and your overall project (love all the web-based tools, btw).

wilersonal

This thing is awesome, you should be proud

bavar

Track using zeptocore, thanks again for this awesome tool!

alkn_niklas

Firstof all I would like to thank you for two amazing music devices!

rd

I appreciate your trying to fix this, I've had my Zeptocore for over a week now and I'm really enjoying it!

Audiowanderer

Playing with the new zeptocore lately. Love its randomization functions, its built in effects and form factor. Here some experiments with flamenco samples. Enjoy

If you like adding randomness to your music to expect the unexpected, the zeptocore is for you

anre

Really amazing inspiring device that is unlike any other, fantastic job.

dve1987mont

I love this thing so far, and I have only scratched the surface.

serairisli

I really love this machine

SubparCurmudgeon

Zeptocore is amazing

lamjmes

Zeptocore is fantastic btw, what a fun bit of gear.

hinze.having

First of all congrats on the launch of the Zeptocore I really love the concept and execution!

qubmoe

Hello Zack, i just received the zeptocore. its a pretty awesome unit.

imonjohnnicholasgeorg

Great fun to build and play… I just put my new Zeptocore together last night and it’s very cool.

zndavid

I am really really impressed.

rajateresidentlien

i just checked out the midi functionality through usb, too, that is a beautiful addition!

rajateresidentlien

really sounding great :D will report back if i find more, but sounding beautiful overall :)

rajateresidentlien

other than that, really enjoying sync, creating tracks for weeklybeats and for fun

rajateresidentlien

these new features are so great: that's brilliant how you have separate sequencing for the bassline, effects, and sample-jumps!

rajateresidentlien

I LOVE changing the quantization across a set of chained sequences! that is beautiful! <3

rajateresidentlien

This Is So Much Fun! <3

rajateresidentlien

i LOVE all the other effects.

rajateresidentlien

i absolutely LOVE the way when i turn the knobs, the LEDs respond by drawing interesting shapes

Field notes

Stories featuring zeptocore

All field notes
Updates · Sep 18, 2026 Zeptocore v8: MIDI slicing and a new visualizer Zeptocore v8 adds USB MIDI slice triggering and a live performance visualizer. Sample jumps and saves are more reliable too. Events · Sep 17, 2026 See you at Punk Rock Flea Market I'll be in Seattle on Friday, September 25, with special Zeptocores and homemade buttons. Come say hello from 2–8 PM. Community · Aug 13, 2026 smol frens Nyblcore was my first hardware device. These tiny synthesizers and DIY kits helped me figure out what a small instrument could be.

Trial download

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Installer compatibility

Firmware

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Normal latency works best for most people. Lower-latency builds respond faster but leave less CPU bandwidth for effects.

Clock mode
Response latency