Good, but
The application is for only 2$ quite good. It bids you what you need - nothing more and nothing less. But I‘d wish for a bit more customisability regarding formatting, letter size, colours, colour changes, etc. Now, you can only chose between a black font on a white background (not even vice versa, that‘d be great in a dark environment), or random colours for font and background that‘ll change with every chapter. Also I‘d wish to save and edit presets. A nice-to-have would be a shrinking bar (or circle) that indicates you visually how much time you‘ve left on the current chapter.