# AudioKit/AudioKitSynthOne

AudioKit Synth One: Open-Source iOS Synthesizer App

Repository: https://github.com/AudioKit/AudioKitSynthOne
Canonical: https://ross.abutalabs.com/products/audiokitsynthone
Homepage: http://audiokitpro.com/synth
Language: Swift
License: MIT
License Family: permissive
Topics: sound, music, synth, synthesizer, keyboard, piano, midi, knob, audiobus, auv3, plugin, audio, audiounit, sequencer, microtonal, touchpad, presets, fx, reverb
Last push: 2022-03-14T16:12:43+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 3343, "days_push": 1633, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1787, forks 230 (observed 2026-08-28T04:05:36.235389+00:00)

## What it is
AudioKit Synth One is a free, open-source iOS synthesizer app built with Swift and AudioKit, featuring MIDI support, a sequencer, analog-style filters, arpeggiators, effects, and 300+ presets. It works on iPhone and iPad, supports AUv3 and Audiobus, and its source code serves as a learning resource for building synth apps.

## Use cases
- play a free synthesizer on iPhone or iPad
- learn how to build an iOS synth app with AudioKit
- use an AUv3 synth plugin inside a mobile DAW
- connect a MIDI keyboard to an iOS synthesizer
- explore open-source audio DSP code in Swift
- create music with presets, arpeggiators, and effects on iOS

## When to choose
- you want a full-featured free synthesizer on iOS
- you want to study or fork open-source iOS audio code
- you need an AUv3/Audiobus-compatible synth for mobile music production

## When to avoid
- you need a desktop or Android synthesizer
- you need a maintained app — it has been replaced by Synth One J6
- you want a lightweight library rather than a full application

## Facets
- artifact type: application
- maturity: maintenance
- function: audio-processing, gui, plugin-system
- domain: audio, mobile-development, media
- platform: -
- tags: synthesizer, auv3, audiobus, midi-keyboard, sequencer, presets, open-source-music-app, midi, audio, ios, mobile, swift

## Member repositories
- AudioKit/AudioKitSynthOne (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:36.235389+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:23:27.822484+00:00, confidence not recorded.
  - readme: https://github.com/AudioKit/AudioKitSynthOne (fetched 2026-08-28T04:05:36.235389+00:00, sha a72e986aeacd)
  - homepage: http://audiokitpro.com/synth (fetched 2026-08-29T11:02:26.248635+00:00, sha 155ce33e9a40)
- Data as of 2026-08-30T08:39:29.467469+00:00.