spool.

iPhone & iPad · Music

Make a whole song
on your phone.

spool. is a pocket music studio inspired by the joy of hardware grooveboxes — play, sample, sequence, and record to tape, all in one playful instrument.

Get spool. Read the guide

Free to download · one-time Spool Pro unlock · no subscription.

Tape mode — the 4-track recorder with spinning reels
Synth mode — engine visualizer and four controls
The step sequencer
Gumball — the bouncing-ball sequencer
Mixer mode — VU meters and pan
The effects rack

One instrument, the whole studio

Fourteen sound engines

Punchy FM, fat subtractive Pulse, shimmering Cluster, plucked String, granular Cloud, the TALK vocoder, the WIDE stereo engine, THUMP bass, a Sampler and more — each with its own animated, touchable visualizer and four hands-on controls.

Sample anything

Record straight from the mic — or import a whole song from Files and crop out just the bar you want — then play it across the keyboard or slice it into a kit.

Drums & beats

Build kits, chop a sample into a playable kit, and lock in grooves with the step sequencer.

Playful sequencers

Pattern and arpeggiator to start; unlock Stream, Taps, and the bouncing-ball Gumball machine for happy accidents.

4-track tape

Record, overdub, varispeed (including reverse), scrub, and bounce your jam to a finished mixdown — export to WAV.

Effects & mixer

A deep rack — delay, spring reverb, drive, compressor, chorus, filter, phaser, tremolo, beat-repeat stutter and a pitch-shifter — plus a master EQ and brickwall limiter so it always sounds finished.

Built to play live

Perform mode puts tape moves — BREAK, REV, CHOP — parameter memos, faders and a double keyboard under your fingers while the tape rolls.

Plays with your gear

Connect a USB or Bluetooth MIDI controller and play Spool like hardware. AUv3 plugin support is planned for a future update.

Simple, honest pricing

Free

Start making music

  • Three sound engines (FM, CLUSTER, PULSE)
  • Pattern & Arp sequencers
  • Full 4-track tape, mixer & Perform mode
  • Three effects + bypass (SPRING, BAT, PUNCH)
  • Two saved projects

Spool Pro · one-time

Unlock everything

  • All fourteen engines
  • Sampling — mic recording & file import
  • Every effect & sequencer
  • Unlimited projects
  • WAV mixdown export & MIDI
  • Every future engine & effect

A single purchase. No subscription, ever.

Coming to the App Store

spool. is heading to TestFlight and then a public 1.0. Want a nudge when it lands? Email [email protected] and we'll let you know.

Notify me at launch