AudioKit Synth One

Created by volunteers, the app includes MIDI support (play it with a MIDI keyboard or controller), sequencer, vintage-inspired analog filters, expressive arpeggiators, warm analog delays, and, over 300+ presets to get you started!

“Best iOS Apps of 2018” – Music Radar “Best iOS Music Apps of 2018” – Cult of Mac “Best of 2018: iOS Apps for Musicians” – Ask.Audio

“This groundbreaking iOS synth app is free and easy for beginners to learn on!” – Cult of Mac

“BEST APP OF 2018, Runner up” – STUFF Magazine Gadget Awards

“A MUST HAVE Synthesizer for iOS Musicians” – Synth Anatomy

“App of the Week” – Stuff.tv, July 2018

Plus, it’s completely open-source. Use the source code to learn how to build your own synth app or modify the app yourself. Anyone can contribute code & features!