# Foldeon: Diatonic Accordion — The phone is the bellows

> The phone is the bellows (iPhone/iPad app by Ilia Filiaev.)

- Source: https://appshunter.io/ios/app/foldeon-diatonic-accordion/id6815307030 (this page in markdown: same URL + `.md`)
- Developer: [Ilia Filiaev](https://appshunter.io/developer/1742628366)
- Category: Music
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 18.0 · 12 MB
- Languages: American English, French (France), German (Germany), Italian, Japanese, Korean, Brazilian Portuguese, Russian, Chinese (Simplified, China), European Spanish and 2 more
- Released: 2026-11-01
- Data updated: 2026-11-02

## What is Foldeon?

Foldeon turns your iPhone into a diatonic button accordion — and on iPhone Duo, the hinge itself becomes the bellows.

Unfold the phone and fold it again: the air moves and the reeds sing. Stop, and the sound stops, just like a real squeezebox. And like every diatonic accordion, opening and closing play different notes on the same key, so a scale runs back and forth with the bellows.

On any other iPhone, tilt the phone toward you and away to work the bellows, or drag the bellows on screen.

WHAT MAKES IT FEEL REAL
• Bellows pressure sets loudness and tone together: a gentle push is soft and dark, a firm one bright and full.
• Free-reed sound with the breath of the valves, synthesized on your iPhone — no recorded samples.
• Push and pull notes on every key, laid out like the real instruments.
• Calibrated to you: a short warm-up learns how you move and how still your phone's sensor is.

INSTRUMENTS
• Easy Accordion in G — free: eight big keys and four basses, two octaves of G major.
• With Pro: Cajun Accordion in C, Melodeon D/G, Two-Row G/C, Norteño G/C/F with 38 keys, and the 20-key Anglo Concertina C/G.

REGISTERS
Clarinet and Violin are free. Pro adds Bassoon, Bandoneón, Musette and Master.

SHARE YOUR PLAYING
Record up to a minute and Foldeon makes a vertical video with the bellows moving the way you played — ready for TikTok, Reels and Shorts. Free videos carry a small "Played on Foldeon" mark; Pro removes it.

NOTE NAMES YOUR WAY
C D E, Do Re Mi, or the German H.

FOLDEON PRO
One purchase, no subscription: five more instruments, four more registers, and videos without the watermark.

PRIVATE BY DESIGN
No account, no ads, no tracking. Your recordings stay on your iPhone until you share them. Foldeon never uses the microphone.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Foldeon Pro | $5.99 | one-time |


## Is Foldeon safe?

Not enough ratings yet to assess Foldeon.

## Is Foldeon legit?

Foldeon: Diatonic Accordion appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Foldeon is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-11-01

No release notes.

## More apps by Ilia Filiaev

- [FocusPosture](https://appshunter.io/ios/app/focusposture/id6773059108)
- [Northsense: Direction Trainer](https://appshunter.io/ios/app/northsense-direction-trainer/id6775890076)
- [PocketBeat Vibrating Metronome](https://appshunter.io/ios/app/pocketbeat-vibrating-metronome/id6775906865)
- [AltLog: Altimeter & Elevation](https://appshunter.io/ios/app/altlog-altimeter-and-elevation/id6775907553)
- [WhisperNote: Whisper to Text](https://appshunter.io/ios/app/whispernote-whisper-to-text/id6775908801)
- [PitchGarden: Chromatic Tuner](https://appshunter.io/ios/app/pitchgarden-chromatic-tuner/id6775909482)

All apps by Ilia Filiaev: https://appshunter.io/developer/1742628366

## Related topics

[piano accordion](https://appshunter.io/ios/topics/piano-accordion)

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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 2026-11-02.*