The free version of this app allows 30 concurrent 'blocks' to be run. No other limitations on functionality are set.

Built into the features of the app, users can create profiles to then export them as a launcher app to easily be launched from ones home screen. Sadly though there is no way to add these to ones app drawer.

Flowcharts offer both a nice way of visualizing the logic and an intuitive way of creating it by dragging and connecting the boxes.