Can I turn a whiteboard photo into an app?
Yes. Some tools accept a photo of paper or a whiteboard directly and read the boxes, arrows and handwriting out of it. One caution: a whiteboard photo is often somebody's unreleased architecture, so it is worth checking whether the tool uploads the image to a third-party service or reads it locally before you feed it anything sensitive.
From Sketch-to-code tools compared: tldraw, Uizard, and more, updated 13 August 2026. That article is where the reasoning behind this answer is set out, including what it does not cover.