Modular Synthesizer is described as 'Modular is a powerful sound design tool which allows you to build your own custom synthesizer by connecting different sound modules together. By separating each synthesis process, modules can be connected in any way' and is a music production app in the audio & music category. There are more than 10 alternatives to Modular Synthesizer for a variety of platforms, including iPad, iPhone, Mac, Windows and Linux. The best alternative is Surge Synthesizer, which is both free and Open Source. Other great apps like Modular Synthesizer are Auxy Music Studio, Audulus, AudioKit Synth One and Addictive Synth.
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!