Surge Synthesizer is described as 'Surge is an open source digital synthesizer originally written and sold as a commercial product by @kurasu (Claes Johanson) at Vember Audio. The synth uses subtractive hybrid synthesis and each patch contains two 'scenes' which are separate instances of the entire' and is an app in the audio & music category. There are more than 25 alternatives to Surge Synthesizer for a variety of platforms, including iPad, Windows, iPhone, Mac and Linux apps. The best Surge Synthesizer alternative is Vital, which is both free and Open Source. Other great apps like Surge Synthesizer are Helm, Odin 2, ZynAddSubFX and Dexed.