Free hand-drawn diagrams that load instantly
A virtual whiteboard for sketching diagrams, architecture and flows in a deliberately rough hand-drawn style.
Use when
You need to explain an architecture or flow quickly, especially on a weak connection.
Skip when
You need a polished diagram for a client deliverable.
Free, open source, no account needed and extremely light — it works on a poor connection where heavier canvas tools stall, which is the practical reason to reach for it. The sketchy aesthetic is intentional: it signals a diagram is a draft, so people critique the idea rather than the polish. Files can be saved locally or shared by link.