Create full songs on your phone with this pocket music studio. It offers a variety of sound engines, sampling capabilities, step sequencing, and a 4-track tape recorder for recording and mixing your music. Effects and MIDI controller support enhance the creative process.
1.0
August 8, 2026
$9.99
Spool Pro
Unlocks every engine, effect, sequencer & export.
spool. allows you to create full songs on your phone by playing, sampling, sequencing, and recording to tape. It includes multiple sound engines, drum kits, and a 4-track tape recorder for mixing and exporting your music.
No, spool. does not contain advertisements. It is free to download and use with a starter set of features, with an optional one-time purchase for full access.
spool. offers fourteen sound engines including FM, subtractive Pulse, Cluster, String, Cloud, TALK vocoder, WIDE stereo, THUMP bass, a Sampler, and two drum machines. A starter set is available for free, with all engines unlocked via a Pro purchase.
Yes, spool. supports connecting USB or Bluetooth MIDI controllers, allowing you to play it like hardware. AUv3 plugin support is planned for a future update.
spool. is free to download and use with a starter set of engines and sequencers. A single one-time purchase of Spool Pro unlocks all features, including all engines, sampling, effects, sequencers, unlimited projects, export, and MIDI.
The 4-track tape recorder in spool. allows you to record up to six minutes of audio, overdub, change playback speed (varispeed), scrub, and bounce your jam into a finished mixdown. The tape is saved with your project and can be exported to WAV.
spool. features a deep effects rack including delay, spring reverb, drive, compressor, chorus, multimode filter, phaser, tremolo/auto-pan, beat-repeat stutter, and a pitch-shifter/harmonizer. Many effects are tempo-syncable, and there's a master EQ and brickwall limiter.
spool. is available for iPhone and iPad, as indicated by its supported devices list. Its age rating is 4+, making it suitable for a wide range of users.