Grainfold

Granular sampler for anything

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

Free to try. One payment unlocks everything, for good: no subscription, ever. New: a live 3D spectrogram, and grains that play melodies in any key. Grainfold turns any sound into an instrument. Record your voice, a glass or the street outside, or import a file. Shape it into loops, playable chords, melodies and evolving clouds of grains. FREE TO TRY. YOURS FOREVER. Grainfold is free to download and play: every sound control and effect, PERFORM, the keyboard, MIDI and the spectrogram, with one region and ten presets. One in-app purchase unlocks the full version for good: four regions, all 40 presets and your own, projects, export, REC and the Audio Unit plugins. One payment. No subscription, ever. FOUR INDEPENDENT REGIONS 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 scatters tiny slices into textures, pulses and harmonies. GRAINS WITH CHARACTER Set how long each grain lasts, how often grains spawn, where they come from and how far they scatter. Vary their length and level, reverse some, spread them wide and loosen their timing. Eight grain shapes, from smooth Hann to plucked Decay, each with its own attack and release. MELODIES FROM GRAINS Let every grain choose its note: random notes of a scale, a line that wanders by steps, a melody that settles on the key, or a short motif that slowly evolves. Any key, any range, at any tempo. 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 fit any loop to one bar, two or four. Lines on the waveform show where every beat falls. A metronome keeps time in any meter from 2/4 to 12/8. In an Audio Unit host, Grainfold can follow the host tempo. MOVEMENT AND EFFECTS Scan through a sample, animate parameters with two LFOs per region, and shape notes and filters with ADSR envelopes. PITCH transposes without changing timing; SPEED changes a loop's tempo, not its pitch. Filters, harmonic LAYERS, drive, a six-voice chorus, DIFFUSE, delay and reverb. SEE THE SOUND The waveform lights up where grains are playing, the scan sweeps through the sound and each LFO draws its wave. Add a live 3D spectrogram of what you hear, full size or docked in a corner: turn it, move it and zoom it with your fingers. PLAY WITH TOUCH OR MIDI In PERFORM, each finger plays a region and controls two parameters. LATCH holds sounds; MOTION records and loops your gestures. Play chords of up to twelve notes from the on-screen keyboard or MIDI, with velocity, sustain and pitch bend. MIDI Learn connects knobs to your controller. RECORD AND EXPORT Record your performance, gestures and effects included, as a 32-bit float WAV, straight into your DAW's folder in Files or iCloud Drive. Render loops or a chosen length at 44.1 or 48 kHz. AUV3 INSTRUMENT AND CAPTURE Play Grainfold inside GarageBand, Logic Pro for iPad, AUM, Cubasis and other Audio Unit hosts, with MIDI, automation and the instrument saved in each song. Grainfold Capture passes a track through while capturing a take into your Grainfold library. PRESETS, PROJECTS AND THEMES 40 factory presets in seven categories, your own, and complete projects to share as .grainfold files. Eight light and dark themes, on iPhone and iPad. PRIVATE BY DESIGN No account, ads or tracking. Grainfold collects no data. Your recordings stay on your device unless you choose to share them.

Ratings & Reviews

  • This app hasn’t received enough ratings or reviews to display an overview.

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.

Version 1.1

The developer, Marcin Sewastianowicz, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    Marcin Sewastianowicz
    Size
    8.6 MB
    Category
    Music
    Compatibility
    Requires iOS 26.0 or later.
    • iPhone
      Requires iOS 26.0 or later.
    • iPad
      Requires iPadOS 26.0 or later.
    • Mac
      Requires macOS 26.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 26.0 or later.
    Languages
    English
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    © 2026 Nightly Build Audio
  • Developer Website
  • Privacy Policy