Starting with iPadOS 18, which will be widely released later this year, iPad apps can offer custom drawing tools for the Apple Pencil.
For example, in a WWDC 2024 coding video last week, Apple demonstrated how an app could implement a tool that allows for cat paw prints and other animal-related symbols to be added to a drawing. The custom tools support features on the new Apple Pencil Pro, including the squeeze gesture and barrel roll action.
iOS 18 and visionOS 2 also support custom drawing tools in apps, but the iPhone and Vision Pro do not support the Apple Pencil. As always, any drawing tool can also be controlled with your finger and other input methods.
In addition to custom tools, apps across iPadOS 18, iOS 18, and visionOS 2 are able to change the selection of default drawing tools that appear in the system tool picker. Apple said apps are even able to offer multiple tools of the same type for added convenience, such as two colors of pens or two colors of markers.
iPadOS 18, iOS 18, and visionOS 2 are currently in beta.
Source: Macrumors