What are some alternatives?
When comparing BlokDust and Ableton, you can also consider the following products
Splice Beat Maker - Make and share beats in your browser
NanoStudio - NanoStudio is a recording studio for iOS, OS X and Windows.
Sampulator - Make (and record) beats on your keyboard
AudioKit Synth One - Free & Open-source iPhone/iPad Synth 🎹
SunVox - SunVox is a small, fast and powerful modular synthesizer with pattern based sequencer (tracker).
Ramsophone - A generative art/music machine. (Be sure to refresh!)