LuSID Synthesizer
Synthwave SID-inspired synth
Free · Designed for iPad. Not verified for macOS.
LuSID Synthesizer — a SID-inspired SwiftUI synth with a synthwave heart.
Eight-voice polyphony with detune-and-spread unison, audio-rate filter envelope, classic SID-flavoured ring modulation and pulse-width modulation, plus a built-in 4 to 64-step sequencer and tape-style delay, chorus, distortion, and lush reverb. Wrapped in a neon Liquid-Glass interface that matches what's playing — magenta sequencer steps that bloom lime when active, a gradient cyan oscilloscope that traces your output in real time, and a synthwave horizon that rolls under the step grid.
FOUR TABS
SYNTH — oscillator (triangle, sawtooth, square, noise) with PolyBLEP anti-aliasing. Custom Cytomic state-variable filter (low-pass, high-pass, band-pass, notch) with drive and self-oscillating resonance. Audio-rate filter envelope. LFO with pitch, cutoff, PWM, and pan destinations. Ring modulation. Distortion (lo-fi, broken, cubed, bitcrush, mangled). Chorus. Delay. Reverb (plate, room, hall, cathedral). Big rotary knobs, all the modulation routing visible.
SEQUENCER — 4 to 64 steps. Tap-to-place notes with the chromatic note picker. Per-step ratchets (1x, 2x, 3x) and held-legato notes for gate-length variation. Tempo from 60 to 440 BPM, gate length 5 to 150 percent of step.
KEYBOARD — two-octave touch piano with multi-touch chords and slide-to-play, velocity slider, octave switcher (C2 to C6).
RECORD — capture everything you hear (filter, drive, delay, reverb, the full chain) to a WAV file in the app's Documents folder, then share via the iOS share sheet. 5 to 60 seconds per take.
LuSID is built for the moments when you want to make sound, not learn software. No menus, no preset hunting, no tutorials. Tap a step, sweep a knob, hold a key. The app treats every parameter as performance.
NO ACCOUNTS. NO ANALYTICS. NO TRACKING. NO ADS.
LuSID does not collect any data, make any network requests, or contain any third-party SDKs. Recordings stay on your device until you choose to share them.
Ratings & Reviews
Now Universal: native iPad support with two-column synth, bigger keyboard, and adaptive layouts.
What's new:
- Interactive ADSR curve — drag the handles to shape your envelopes.
- Hold latch — sustain notes forever for drones and pads.
- Long release and decay (up to 20 seconds) for soundscapes.
- Refreshed visuals: glowing waveform glyphs, filter pills, animated background, hero with note name, redesigned splash.
- Save and recall patches via the new Patches sheet.
- Stereo Width control with Spatial Audio support on AirPods Pro/Max.
- Audio fix: app no longer goes silent after saving a patch.
The developer, Lukasz Pomianek, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Lukasz Pomianek
- Size
- 3.2 MB
- Category
- Music
- Compatibility
Requires iOS 18.4 or later.
- iPhone
Requires iOS 18.4 or later. - iPad
Requires iPadOS 18.4 or later. - Mac
Requires macOS 15.4 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.4 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Łukasz Pomianek