Cool app
Seems to work well and easily understandable if you understand the 303 sequencer. Would love to see a random sequence function and ability to sequence less than 16 steps.
Free
About
Quickly create, manage, and play back acid bassline synth sequences. Features a step sequencer, built-in synth knobs for tone shaping, and CSV export for backups. Ideal for musicians needing to save and recall patterns.
✓Step sequencer interface
✓Instant pattern playback
✓TB-303 style tone knobs
✓CSV pattern export
✓Dark mode support
Show original description
What's New in 303 Note
2.2.0
August 13, 2026
MIDI export is here. - Export your patterns as MIDI files. Drop them into GarageBand, Logic, Ableton Live or any other DAW and keep working on your track. Accents and slides come along too. - Sort right from the pattern list. Tap the button in the bottom right to switch between name, date and favorites. - Per-pattern actions in one place. Tap "..." on any row to export or delete it. - Tempo and sound settings (cutoff, resonance, envelope, decay, accent) are now saved with each pattern, so it sounds the same next time you open it. Thanks for using the app!
MoreUser reviews
Developer apps
FAQ
What is 303 Note used for?
303 Note is an application designed for quickly jotting down, managing, and playing back acid bassline synth sequences, inspired by the TB-303 synthesizer. It allows users to save patterns and adjust the sound using built-in synth knobs.
Does 303 Note have ads?
No, 303 Note does not contain advertisements. It is a completely free application with no ads to interrupt your creative process.
How does 303 Note's sequencer work?
The app features a dedicated step sequencer screen that mimics the feel of the original hardware. Users can edit Note, Down/Up, Accent, and Slide parameters directly on this screen.
Can I export my patterns from 303 Note?
Yes, 303 Note supports CSV export for your saved patterns. This feature allows for easy backup and management of your sequences on a computer.
What kind of tone controls does 303 Note offer?
303 Note includes TB-303-style tone knobs for shaping your basslines. You can adjust CUTOFF, RESO, ENV, DECAY, and ACCENT to dial in the desired squelchy sound before committing patterns.
Is 303 Note available on multiple devices?
Currently, 303 Note is supported on iPhone devices. Information regarding availability on other platforms like Android or tablets is not provided.
How often is 303 Note updated?
The latest version of 303 Note is 2.0.0, which was last updated on July 5, 2026. This indicates a recent update, suggesting ongoing development and support.
What is the age rating for 303 Note?
303 Note has an age rating of 4+. This means it is suitable for users aged four and older, indicating no mature content.
