Otoo is a playful instrument for making beats and melodies, designed to feel easy from the first tap yet deep enough to keep growing with you. Its free-form step sequencer lets you place, drag, and stack notes freely instead of locking everything into rigid rows. Use the built-in sounds, sampler, or your favorite AUv3 instruments in seconds, then take ideas further with hands-on performance controls and sequencer effects. On iPhone, Otoo makes AUv3 instruments feel at home with a large instrument view and a compact keyboard for immediate playing.

Beautifully simple workflow

• Free-form step sequencer with instruments not tied to fixed rows

• Single-screen workflow with sequence, song structure, and mixer always visible

• Tap or drag notes onto the grid to build beats and melodies

• Stack notes to create chords

• Per-step control of length, subdivision, and velocity
• 4 rows on iPhone and 5 on iPad, with multiple instruments available in each row at different steps

• 2-octave keyboard for playing and learning real notes
• Multi-gesture mixer for switching instruments, muting, soloing, and adjusting volume

Sounds and plug-ins

• Up to 8 instruments per project

• Built-in sounds and sampler

• Use any installed AUv3 instruments in a large, near-fullscreen view with a compact keyboard

• Up to 2 AUv3 effects per instrument

• Sampler with instant key-by-key recording and chromatic mapping

Patterns to full songs

• Build songs from simple patterns

• Draggable loop markers for quick arrangement changes

Performance mode

• Live sequencer and audio effects such as reverse, beat repeat, randomize, swing, triplet, tape, and more

• Play the pattern like a keyboard by tapping steps directly

Other features
• Main output with built-in level protection
• Automatic metronome when recording live into empty patterns
• Export patterns or full songs as WAV or MP3 for easy sharing