This has been a very good week for apps, especially Chinese learning ones.
Rye Studio has developed a fairly large library of their RyeBooks Apps. In the world of Chinese storybook apps, these are some of the most visually appealing apps I have come across. Rye Studio is currently offering a large portion of their collection for free download for a limited time. Normally, their book apps range from $0.99 to $1.99.
One of the worse things about many of the Chinese e-book apps out of the market is that their English translations are really awful, the poor quality audio, or heavily accented. Rye books avoids all of these pitfalls. You will have to personally judge whether or not you like the individual stories. I find them to be acceptable, but not stellar from a writing and story telling perspective. However, for my personal purposes, I am not expecting great literature, just something acceptable to use for learning Chinese.
One the nice features about these apps is that you can toggle the text to be English, traditional or simplified Chinese with pinyin, traditional Cantonese with Wade-Giles, and even some other languages like Spanish, German, Japanese, Korean, Vietnamese, French, etc. You can have audio in these various languages as well. Every book has English and Chinese, but the additional languages vary from book to book. There is also a page of just the story text without the animation which is really useful for reading practice especially since the pinyin can be shown with the characters. You can also record your own audio for the app as well.
Recommended for ages 2 and up.