Some did already but there is lots of major players that did not, Korg being one of them.
And I guess Korg releases more of their iOS developed apps soon?
*** Special Sale for a limited time to celebrate the debut of KORG Kaossilator for Android (50% OFF) until Jan 5! ***
A mobile synthesizer app for Android OS.
The iKaossilator app for iOS became an enormous hit when it was released in 2011, and now it's available as an Android app. "KORG Kaossilator for Android" is a synthesizer app that lets anyone enjoy full-fledged instrumental performance simply by freely moving their finger across the touch panel. From electronic sounds to acoustic instruments and drums, you can play a wide range of sounds with a single finger. Also provided is a sequencer that's indispensable for creating songs, so you can create tracks by recording and layering your performances. This easy yet full-fledged instrumental experience is now available on your Android smartphone.
- Perform using touch gestures: Kaossilator uses the unique X-Y interface. Create melodies and phrases simply by stroking, tapping, or rubbing the touch screen with your finger.
- 150 diverse sounds covering many music styles: Use the 150 built-in sounds to perform and produce a broad range of dance music styles including EDM, hip-hop, house, techno, dubstep, nu-disco, and electro.
- Scale/Key feature eliminates any wrong notes: The Scale setting ensures that the notes of your performance will stay in the key you’ve specified. Choose from 35 different scales including chromatic, major, minor, and even blues scales.
- Loop sequencer for easy track-making and live performance: The built-in loop sequencer lets you layer up to five musical parts. By recording sounds such as synth, bass, chords, sound effects, and drums into each part, you can quickly complete original loop tracks that are distinctively your own.
- Operation Requirements
Android 5.0 or later
More info at korg.com