# DuoBox: Fold Accordion — Your Duo is now an accordion

> Your Duo is now an accordion (iPhone/iPad app by Aaron Peabody.)

- Source: https://appshunter.io/ios/app/duobox-fold-accordion/id6818382295 (this page in markdown: same URL + `.md`)
- Developer: [Aaron Peabody](https://appshunter.io/developer/6795305965)
- Category: Music, Entertainment
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 27.0 · 2 MB
- Languages: American English, German (Germany), Brazilian Portuguese, European Spanish
- Released: 2026-10-11
- Data updated: 2026-10-12

## What is DuoBox?

DuoBox turns iPhone Duo into an accordion. Hold it open like a book, with the bass buttons under one hand and the treble keys under the other, and fold the phone to work the bellows. Opening is pull and closing is push. The faster you fold, the louder and brighter it plays.

The reeds are synthesized live on the phone, so every note follows the bellows. There are no ads and no accounts, and the full app is a single purchase, not a subscription.

THE ACCORDIONS
• Piano: a piano accordion keyboard, with bass and chords for F, C, G, Dm, Am and Em
• Norteño: a three-row button accordion in GCF with a 12-bass. FBbEb, EAD, ADG and BbEbAb are a tap away
• Diatonic: a one-row button box, where push and pull play different notes

PLAYING
• Eleven treble registers, including Musette and Bandoneon
• An AIR button that moves the bellows silently
• Room, delay and distortion, plus transpose and octave shifts
• Song mode lights the next key and chord, so anyone can play a tune
• A left-handed layout, swapped push and pull, and Do Re Mi note names
• VoiceOver support: the keys play by direct touch

RECORDING
• Takes saved as 48 kHz, 24-bit WAV stems, with and without effects, aligned to the sample
• A metronome and count-in that put each take on bar 1 in Logic Pro
• MIDI out over Bluetooth or Wi-Fi, with the bellows sent as Expression, Mod Wheel or Breath

Free to play. One purchase opens Norteño and Diatonic, every register, effect and song, WAV stems, MIDI out and the Gold app icon. You pay once, keep it, and can share it with your family.

With the Duo closed, or on any other iPhone, drag the bellows with a finger.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Unlock Everything | $4.99 | one-time |


## Is DuoBox safe?

Not enough ratings yet to assess DuoBox.

## Is DuoBox legit?

DuoBox: Fold Accordion has limited verification signals. The AppsHunter Legitimacy Score for DuoBox is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-10-12

No release notes.

## Apps similar to DuoBox

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Simple Accordion](https://appshunter.io/ios/app/simple-accordion/id6756825422) | — | Free | Music |
| [SynthBridge MIDI Synth](https://appshunter.io/ios/app/synthbridge-midi-synth/id6778690596) | 4.7 (3) | Free | Music |
| [Guiro: Guacharaca Percussion](https://appshunter.io/ios/app/guiro-guacharaca-percussion/id6804265857) | — | Free | Music |
| [Musical Chord](https://appshunter.io/ios/app/musical-chord/id1561501855) | 5.0 (4) | $9.99 | Music |
| [Jam Recorder: Music Separator](https://appshunter.io/ios/app/jam-recorder-music-separator/id6751782457) | 4.6 (13) | Free | Music |
| [Accordion Sim](https://appshunter.io/ios/app/accordion-sim/id6738851064) | 4.2 (19) | Free | Music |

## More apps by Aaron Peabody

- [PipeBook: Pipefitter Reference](https://appshunter.io/ios/app/pipebook-pipefitter-reference/id6795305963)

All apps by Aaron Peabody: https://appshunter.io/developer/6795305965

## Related topics

[diatonic accordion](https://appshunter.io/ios/topics/diatonic-accordion) · [acordeón diatónico de botones](https://appshunter.io/ios/topics/acordeón-diatónico-de-botones) · [mesquite diatonic accordion](https://appshunter.io/ios/topics/mesquite-diatonic-accordion) · [acordeon gratis](https://appshunter.io/ios/topics/acordeon-gratis) · [accordion lessons](https://appshunter.io/ios/topics/accordion-lessons)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-12.*