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Show HN: I built a WebMIDI sequencer to control my hardware synths

Show HN: I built a WebMIDI sequencer to control my hardware synths

3 comments

·December 11, 2025

Hey HN,

I’m an ex-Google engineer trying to get back into music production.

I needed a way to sequence my hardware synths using AI contexts without constantly switching windows, so I built this.

It runs entirely in the browser using WebMIDI. No login required. It connects to your local MIDI devices (if you're on Chrome/Edge) and lets you generate patterns.

Tech stack: [React / WebMIDI API / etc].

Link: www.simplychris.ai/droplets

Code is a bit messy, but it works. Feedback welcome.

vermon

Vibe coded? Asking because it looks very similar to my vibe coded webmidi project which is a beatmatching practice for DJ’s :) https://beat.maido.io/

rcarmo

This is pretty cool in concept. Need to go and get stuff to plug into my laptop to test :)

thenthenthen

Does webmidi works over usb-otg? Then maybe it could run from a phone or tablet!