MotionBook is a creative app designed for individuals who enjoy making flipbook animations. With this app, you can create traditional frame-by-frame animations using your iPhone or iPad. The app provides a range of well-designed digital tools to enhance your artistic effects, including a natural feel pen and eraser tool set with various options such as Pencil, Inking Pen, Marker, Paint Brush, Hard & Soft Erasers. It also fully supports pressure sensitivity of Apple Pencil.

The MotionBook app offers convenient Undo/Redo functionality and allows you to use predefined color palettes or customize your own. It features a "Timeline" to easily manage all your pages and customize the Frames Per Second (FPS). The "Onion Skin" option enables you to see previous and next pages as references while animating.

In addition to the basic tools, MotionBook provides advanced editing features that allow you to quickly tweak drawing details, copy drawings, paste them to another page, or even import images from other apps. You can export your animations to video (mp4) or GIF format and easily share them with friends or create your own stickers.

The app is integrated with the iOS Files system, allowing you to easily manage all your flipbook files. You can store your files on iCloud and sync them across your iPhones and iPads. MotionBook also offers various sample templates to help you get started on your animation journey. Furthermore, you can use a video clip as a background to learn to draw poses or add hand-drawn elements to your favorite videos.

Overall, MotionBook is a comprehensive app that provides a user-friendly interface and a wide range of tools to create flipbook animations on your iPhone or iPad.