# Grainfold — Granular Synth for Any Sound

> Granular Synth for Any Sound (iPhone/iPad app by Marcin Sewastianowicz.)

- Source: https://appshunter.io/ios/app/grainfold/id6821361824 (this page in markdown: same URL + `.md`)
- Developer: [Marcin Sewastianowicz](https://appshunter.io/developer/6821361826)
- Category: Music
- Price: Free (on sale, was $9.99)
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 26.0 · 16 MB
- Languages: American English
- Released: 2026-10-31
- Data updated: 2026-11-13

## What is Grainfold?

Grainfold is a granular synth that turns any sound into an instrument. Record your voice, a glass or the street outside, or import a file, and shape it into loops, playable chords, melodies and evolving clouds of grains.

A GRANULAR SYNTH YOU CAN PLAY
Granular synthesis cuts a sound into tiny grains and plays them back in new ways. Grainfold makes it hands-on: set how long each grain lasts, how often grains spawn, where they come from and how far they scatter. Reverse them, spread them across the stereo field, give them a shape from smooth to plucked, and play them from the keyboard, MIDI or your fingertips.

FOUR REGIONS, LOOP OR GRAIN
Mark up to four parts of a sound, each with its own mode, pitch, envelopes, filter and modulation. LOOP repeats a region with fades and crossfade; GRAIN turns it into textures, pulses and harmonies.

MELODIES WITHOUT A KEYBOARD
The step sequencer plays sixteen steps of any scale in time with the tempo. Or let every grain choose its note: random notes of a scale, a wandering line, a melody that comes home to the key, or a slowly evolving motif.

SHAKE TO PLAY
In SHAKE mode, balls bounce around the sound as you shake and tip your phone, like a pong ball off the edges of the screen, and the grains follow them.

HARDWARE LOOK, CRT SCREEN
A silver metal body that catches the light as you tilt your phone, solid keys, big knobs and a waveform on a glowing CRT screen, with bloom and scanlines. Each grain is a spark, as big as it is long. A small spectrogram, an oscilloscope and a 3D spectrogram show what you hear.

LOCKED TO THE BEAT
Type or tap a BPM. Spawn grains on the beat, set their length, the scan, the LFOs and the delay in note values, and see where every beat falls. A metronome keeps time in any meter. In an Audio Unit host, Grainfold follows the host tempo.

MOVEMENT AND EFFECTS
Two LFOs per region, ADSR envelopes for notes and the filter, PITCH that keeps timing, SPEED that keeps pitch. Filters, harmonic LAYERS, drive, chorus, DIFFUSE, delay and reverb.

PLAY WITH TOUCH OR MIDI
In PERFORM, each finger plays a region and moves two parameters; LATCH holds sounds and MOTION loops your gestures. Chords of up to twelve notes from the on-screen keyboard or MIDI, with velocity, sustain, pitch bend and MIDI Learn.

RECORD, EXPORT, AUV3
Record your performance as a 32-bit float WAV straight into your DAW's folder. Play Grainfold as an AUv3 instrument in GarageBand, Logic Pro for iPad, AUM or Cubasis; Grainfold Capture records takes from any track.

40 PRESETS AND 20 STARTER PROJECTS
Factory presets in seven categories, your own presets, and starter projects that each bring their own recording, root note and tempo. Share projects as .grainfold files.

FREE, AND PRIVATE
Every feature is free. No account, ads or tracking: Grainfold collects no data, and your recordings stay on your device.

## Is Grainfold safe?

Not enough ratings yet to assess Grainfold.

## Is Grainfold legit?

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


## Version history (last 3 releases)

### 1.2 — 2026-11-09

Grainfold now looks and plays like a piece of hardware.

• One new look in place of the themes: a silver metal body that catches the light as you tilt your phone, solid keys, big knobs with brushed silver caps, and the waveform on a glowing CRT screen with bloom and scanlines. Shake the phone and the screen fills with static.
• Grains as sparks: each grain glows where it plays, as big as it is long, swelling and fading with its envelope.
• A step sequencer: sixteen steps of a scale, played in time, so you can make melodies without a keyboard. It keeps your melody when you change presets.
• SHAKE: a new scan mode where balls bounce around the sound as you shake and tip your phone, and the grains follow them.
• A small spectrogram and an oscilloscope under the waveform, the 3D spectrogram through the same glass.
• 20 starter projects, each with its own recording, from guitar pads to rubber basses and lunchbox keys.
• Every feature is free.

### 1.1 — 2026-11-03

Grainfold is now free to download. One payment unlocks the full version for good: no subscription, ever. Already bought Grainfold? The full version stays yours, nothing to pay.

• A live 3D spectrogram of what you play, full size or docked in a corner of the waveform: turn it, move it and zoom it with your fingers.
• Melodies from grains: each grain picks its note, at random from a scale, wandering by steps, as a melody that settles on the key, or as a slowly changing motif.
• Turn any knob and the waveform shows what it does: a grain's length, how often grains come, where from, their notes, the filter, the echoes and more.
• Lock any rate to the beat: with the tempo on, tap the metronome beside SPEED, LENGTH, SPAWN RATE, SCAN's SPEED, an LFO's RATE or the delay's TIME, and it turns in note values. With the tempo off, everything runs free.
• See the beat: lines on the waveform show where each beat falls as the loop or scan plays, and flash as it passes.
• Grains up to two seconds long.
• Clearer grain visuals: the waveform always shows, and lights up where grains are playing.
• A calmer layout: bigger dials, related knobs grouped, the region's controls on the waveform, a new Pitch page, and SPREAD beside MASTER on FX. A greyed-out knob is locked: tap it to see why.
• Built for iOS 27.

### 1.0 — 2026-10-31

No release notes.

## Apps similar to Grainfold

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Cinescapes Pro](https://appshunter.io/ios/app/cinescapes-pro/id6824872704) | — | Free | Music |
| [DJFX Looper (AUv3)](https://appshunter.io/ios/app/djfx-looper-auv3/id6829127528) | — | Free | Music |
| [Augmatic GRE Lite](https://appshunter.io/ios/app/augmatic-gre-lite/id6762471541) | — | Free | Music |
| [apeCsound](https://appshunter.io/ios/app/apecsound/id6821382219) | — | Free | Music |
| [Pikoto: FM Synth Groovebox](https://appshunter.io/ios/app/pikoto-fm-synth-groovebox/id6819447230) | 5.0 (2) | Free | Music |
| [Geography: Granular Synth](https://appshunter.io/ios/app/geography-granular-synth/id6817076723) | 5.0 (1) | Free | Music |

## More apps by Marcin Sewastianowicz

- [Spaceprint: Sound of a Place](https://appshunter.io/ios/app/spaceprint-sound-of-a-place/id6829578164)
- [Singscore: Vocal Warm Up](https://appshunter.io/ios/app/singscore-vocal-warm-up/id6829618858)

All apps by Marcin Sewastianowicz: https://appshunter.io/developer/6821361826

## Related topics

[apps for sound editing and mixing](https://appshunter.io/ios/topics/apps-for-sound-editing-and-mixing)

---

*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 2026-11-13.*