Free keyboard-first whiteboard for system design interviews. ✦ Service, database & cloud nodes (AWS, GCP, Azure) ✦ Animated connectors: sync ⇄, async ◆, stream ≋ ✦ Trade-off badges — CAP theorem, consistency, scaling ✦ Diagram-as-Code: type [A] -> [B x3], auto-lays out ✦ Export PNG or animated GIF ✦ Interview timer + scratchpad for scale estimates No signup. No time limit. Works in your browser. Free during beta.