SJ-SQUARE - Synthesizer
Analog Poly Synth Keyboard
$0.49 · Designed for iPad. Not verified for macOS.
SJ-SQUARE is a Super Jupiter–inspired analog polyphonic synthesizer for iPhone.
A warm brown chassis and amber glow meet a hands-on module layout: oscillators, filter, envelopes, LFO, and effects — built for playing, not menus.
FEATURES
• Multi-oscillator panel with wave, octave, and level controls
• Filter with resonance, envelope intensity, and key tracking
• Filter envelope & amp controls for expressive shaping
• LFO, OSC 2 detune / live layer, chorus, delay, and reverb
• Unison (1–4 voices), tempo / tap, and scale snap
• Full on-screen keyboard with octave shift & range minimap
• MIDI input support for external controllers
• Built-in presets ready to play
• Landscape-optimized performance UI
Craft rich pads, biting leads, and stacked unison tones. Tweak cutoff and envelopes in real time, then perform with the keyboard or your MIDI gear.
From the maker of KG-SQUARE, JP-SQUARE, and DX-SQUARE — hardware-inspired synth apps for musicians who love hands-on sound design.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
・Improved keyboard responsiveness.
・Minor bug fixes.
The developer, Kouki Yoshimoto, 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
- Kouki Yoshimoto
- Size
- 31.1 MB
- Category
- Music
- Compatibility
Requires iOS 26.5 or later.
- iPhone
Requires iOS 26.5 or later. - iPad
Requires iPadOS 26.5 or later. - Mac
Requires macOS 26.5 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.5 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 koukyoshim67
