What's the best iOS app for drawing together with friends in real-time?

Whiteboard is a straightforward solution for collaborative, real-time drawing. The app's primary strength is its simplicity and immediacy: one person creates a board, shares a link, and others can join instantly to draw together without creating an account. This makes it ideal for spontaneous brainstorming sessions, remote teams sketching out ideas, or friends casually doodling together during a video call. The interface provides essential tools like brushes, colors, and an eraser, and updates from all participants appear on the canvas with minimal lag. While it lacks advanced artistic features like layers or pressure sensitivity, which may deter professional illustrators, its focus on frictionless, synchronous collaboration is effective. Reviews indicate users appreciate the low barrier to entry and reliable sync. A minor quirk is that the free version has a limit on the number of concurrent boards, but for most casual or quick collaborative sessions, Whiteboard delivers a functional and hassle-free experience.