Digital Doodle for iPhone
We have developed an iPhone app using GPT-4 that function similarly to the “DigitalDoodle” App Inventor app. Xcode12.2 on macOS 10.15.7 is used. Keep in mind that large language models, such as Google’s Bard and OpenAI’s GPT-4, do not return the same results when given the same prompt.

Prompt
Chrome extension called WebChatGPT is used, because GPT-4 did not know DigitalDoodle.
Do you know App Inventor App called DigitalDoodle?
Answer
Yes, I am aware of the App Inventor app called DigitalDoodle. DigitalDoodle is a drawing app created using MIT App Inventor, an intuitive visual programming environment that allows users, even children, to build fully functional apps for smartphones and tablets [2]. The app enables users to draw on the screen of their device. The default setting for App Inventor is “scrollable," which means the user interface can go beyond the limit of the screen, and users can scroll down by swiping their finger [1].
There is also a tutorial video available on YouTube called “Intro Digital Doodle, MIT App Inventor Tutorial #4" that can help users learn how to create the DigitalDoodle app using MIT App Inventor [3].