1. Home
  2. 🎵 Music
  3. DuoBox
DuoBox: Fold Accordion

DuoBox: Fold Accordion

Your Duo is now an accordion

8 ratings
3 reviews
🎬 Entertainment
🎵 Music
Free
In-App Purchases

Details

Released
October 11, 2026
Updated
October 29, 2026

Features

Developer

Aaron Peabody
✨Promote your app ✨
DuoBox: Fold Accordion video #1 for iPhone
DuoBox: Fold Accordion screenshot #2 for iPhone
DuoBox: Fold Accordion screenshot #3 for iPhone
DuoBox: Fold Accordion screenshot #4 for iPhone
DuoBox: Fold Accordion screenshot #5 for iPhone
DuoBox: Fold Accordion screenshot #6 for iPhone
iphone
iphoneDuo
ipad
🧾$4.99
In-App Purchase↘︎
⭐3
Reviews↘︎
📝17+ tags
Tags↘︎
🔄6+ apps
Alternatives↘︎
❓8 answered
FAQ↘︎
📦~ in 0 day
Updates frequency↘︎
🖼️Get Icon
Icons↘︎

About

This app transforms your iPhone into a virtual accordion, allowing you to play various accordion types with intuitive bellows control. It offers a range of treble registers, effects, and recording capabilities, with an optional purchase to unlock all features.

✓Virtual accordion with live synthesized reeds
✓Multiple accordion types (Piano, Norteño, Diatonic)
✓Eleven treble registers including Musette and Bandoneon
✓Song mode with guided key and chord lighting
✓Recording capabilities with WAV stem export
✓MIDI out over Bluetooth or Wi-Fi
Show original description

What's New in DuoBox

1.1.1

October 29, 2026

More fixes for playing while you fold iPhone Duo, thanks to a player who sent a video: • Treble keys and buttons now keep sounding through the whole fold, as the bass buttons already do. • A finger that lands on a new key mid-fold plays it straight away. Also new: • On iPad, the record and menu buttons sit clear of the window controls in the corner. • Recording counts in one bar before the take starts. Turn off Count-in in Studio to start straight away. • A Write a Review link next to Support.

More
1

Subscriptions & In-App Purchases

$4.99

Unlock Everything

Every mode, register, effect and song, WAV and MIDI.

User reviews

Most RecentHighest RatedLowest Rated

Love the continued updates!

I love how it is free to try, and a small one time unlock for literally ALL of the features!
TTSP007

Smooth, easy-accordion action

This plays very easily, the rock the phone setting for people who don't have iPhone Duos is super well thought out.
UUbermensh99

I just like how it hooks up to Logic Pro

I’m not a serious musician, but I had to try this out. I can’t believe some of the sounds I’m getting. Very cool. And I just like how it connects to my Logic Pro seasons!
MMamaWeissen

Developer apps

PipeBook Pipefitter Calculator
PipeBook Pipefitter Calculator

Rolling Offset & Flange Charts

📊 Productivity

(10)

$12.99
Shut the Fold: Shut the Box
Shut the Fold: Shut the Box

Shut your phone to roll

🎮 Games

(3)

Free
In-App Purchases
Knotty Navy
Knotty Navy

A sea battle with toy boats

🎮 Games

(3)

Free
In-App Purchases
See developer apps

FAQ

What is DuoBox?

DuoBox is a mobile application that transforms your iPhone or iPad into a virtual accordion. It allows users to play different types of accordions using the device's screen and motion sensors to simulate bellows action.

How does DuoBox work?

The app synthesizes accordion sounds live based on your input. Users can hold the device open like a book to access bass and treble keys, and fold or rock the device to control the bellows, simulating the push and pull of a real accordion.

What types of accordions are available in DuoBox?

DuoBox offers three main types: Piano accordion with F, C, G, Dm, Am, and Em bass buttons; Norteño accordion in GCF with a 12-bass; and a Diatonic button box where push and pull notes differ.

Does DuoBox have ads?

No, DuoBox does not contain any advertisements. The app is free to download and offers all its features through a single, one-time purchase.

What are the recording features of DuoBox?

DuoBox allows you to save recordings as 48 kHz, 24-bit WAV stems, with or without effects, aligned to the sample. It also supports MIDI out over Bluetooth or Wi-Fi, sending bellows data as Expression, Mod Wheel, or Breath.

Is DuoBox available on other platforms besides iPhone?

DuoBox is designed for iPhone and iPad. While the full bellows functionality is optimized for iPhone Duo, other iPhones and iPads can use touch or device rocking to pump air.

How often is DuoBox updated?

The latest version of DuoBox is 1.1.1, last updated on October 29, 2026. While specific update frequency isn't detailed, this indicates recent development and support.

What is the age rating for DuoBox?

DuoBox has an age rating of 4+. This suggests it is suitable for children and general audiences, with no mature content.