Transform your device into a versatile synthesizer with a touch-sensitive keyboard, morphing oscillators, and a resonant low-pass filter. Explore 100 presets, add real-time effects, and record your performances. Connect MIDI controllers for expanded creative possibilities.
2.2.1
October 12, 2026
A big update for Synth Box: • Redesigned welcome tour and Premium screen, sized for every iPhone and iPad • MIDI: choose the pitch bend range, send your notes out to other gear, and enjoy steadier controller connections • Delay fixed: it now blends with your dry sound and follows the Mix knob • Hold and Mono stay the way you left them • Sound stops when headphones are unplugged • Deleting a recording now asks for confirmation • More reliable purchases and restore • Many small fixes and improvements
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Thank you so much! We love hearing that Synth Box is helping with the horror soundtrack for your movie. Good luck with the film! 🎬
Synth Box is a mobile music synthesizer that turns your iPhone and iPad into a versatile instrument. It features a playable keyboard, sound-shaping tools, effects, and recording capabilities.
Synth Box is free to play, offering 20 starter presets and basic synthesizer functions. To unlock all 100 presets, recording, saving custom patches, and MIDI support, a premium upgrade is required.
Premium access can be obtained through a monthly subscription ($3.99/month), a yearly subscription ($19.99/year) with a 3-day free trial, or a one-time Lifetime purchase to unlock all features permanently.
Yes, Synth Box fully supports connecting external USB or Bluetooth MIDI controllers. You can play Synth Box with external keyboards, wheels, and knobs, and even send notes back out to other apps or gear.
Yes, Synth Box is designed to work fully offline, allowing you to create music without an internet connection. No account or sign-up is required, and your data is never collected.
The latest version of Synth Box is 1.0.2, last updated on September 17, 2026. Updates typically include new features, sound improvements, and bug fixes to enhance the user experience.
Synth Box is designed for iPhone and iPad. It is compatible with iOS devices and offers both light and dark themes for a comfortable user experience.
Synth Box offers two morphing wavetable oscillators, a sub oscillator, FM, and noise for rich tones. Combined with a Moog-style low-pass filter and ADSR envelope, you can create a wide range of sounds from basses and leads to pads and FX.
