Dynamic animation scheduling techniques are described in which application callbacks are employed to permit dynamic scheduling of animations. An application may create a storyboard that defines an animation as transitions applied to a set of variables. The storyboard may be communicated to an animation component configured to schedule the storyboard. The animation component may then communicate one or more callbacks at various times to the application that describe a state of the variables. Based on the callbacks, the application may specify changes, additions, deletions, and/or other modifications to dynamically modify the storyboard. To draw the animation, the application may communicate a get variable values command to the animation component. The animation component performs calculations to update the variable values based on the storyboard and communicates the results to the application. The application may then cause output of the animation defined by the storyboard.