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.
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Viktor.comAn AI coworker that actually does the work
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Hey PH! 👋
I built SystemDesignBoard after bombing a system design interview because I spent the first 5 minutes fighting Excalidraw instead of thinking about the architecture.
The idea: a whiteboard that already knows about services, databases, cloud providers, and trade-offs — so you can focus on the design, not the tooling.
A few things I'm proud of:
→ The animated connectors actually show communication type (sync vs async vs stream) — not just arrows
→ Diagram-as-Code lets you type your architecture and it auto-lays out in seconds
→ The whole thing is keyboard-driven — place a node, connect it, annotate it without ever touching the mouse
It's free during beta. Would love your feedback on what's missing or broken. 🙏
Try it: https://systemdesignboard.com/app