If your goal is to create a digital book with realistic page-turning effects rather than hand-drawn cartoons, these tools are the industry standard: FlipaClip: Draw 2D Animation - Apps on Google Play
: Widely considered one of the most intuitive tools for traditional 2D animation, it allows users to draw directly or scan paper drawings to create seamless sequences.
: A free, browser-based tool that is excellent for creating simple animations and games without the need for high-end hardware. Best Mobile Apps for Animation on the Go
: A lightweight, open-source program perfect for beginners. It is portable, meaning it doesn't require a traditional installation; you simply download and run the file.