A sketchbook app is a digital application designed for artists and designers to create drawings, sketches, and illustrations using a tablet or smartphone. These apps typically offer a variety of drawing tools, such as pens, pencils, brushes, and erasers, along with features like layers, blending modes, and customizable canvas sizes.

Popular sketchbook apps include Procreate, Adobe Fresco, Autodesk SketchBook, and Tayasui Sketches, among others. Each app may have its own unique features and interface, catering to different preferences and styles of digital art creation.

Some key features you might find in a sketchbook app include:

• Drawing tools: Pens, pencils, brushes, and erasers with various sizes and textures.

• Layers: Ability to create and manage multiple layers for organizing artwork.

• Blending modes: Options to blend colors and textures for more complex effects.

• Customizable canvas: Adjust canvas size, resolution, and orientation to fit your needs.

• Export options: Save or export artwork in various formats, such as PNG, JPEG, or PSD.

• Pressure sensitivity: Support for stylus input with pressure sensitivity for more natural drawing experience.

• Undo/redo: Easily correct mistakes or experiment with different ideas.

These apps are popular among digital artists, illustrators, and anyone who enjoys drawing on their mobile devices or tablets. They offer a convenient and versatile way to create art on the go, without the need for traditional art supplies.