Heat Synthesizer by Nils Schneider is a Virtual Instrument Audio Plugin and a Mobile Audio App and a Standalone Application for Windows and Android. It functions as a VST Plugin and a Standalone Application.
If you are using an Android phone or tablet and a DAW on your PC, this is a must have. In my opinion this feature packed synth is a no-brainer for this price. Cool feature is also the preset exchange between users that is integrated in the app. I really enjoy the possibility to sit in the garden and to design the sounds on my phone that I want to use later in the DAW.
It's a fantastic app, but the VSTi still needs work. I've had trouble with it since day one. With that said, the developer is very personable and he listens! He has updated the VSTi after I'd complained about it not saving presets in my DAW, and while I still haven't had any luck getting it to work, I'm certain he will sort it out eventually. It's 4 bucks: GET IT.