https://discchord.com/appnews/2020/03/13/freebies-korg-ikaossilator-and-kaossilator-for-android (https://discchord.com/appnews/2020/03/13/freebies-korg-ikaossilator-and-kaossilator-for-android)
You can also get the model D Moog app for free now. Some serious synth tones.