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System Design Sandbox is the interactive playground for system design interviews.
Drag and drop real components (load balancers, caches, Kafka, shards, etc.), build your architecture, and get instant AI feedback that catches missing rate limiters, single points of failure, wrong consistency choices, and more with clear fixes.
TinyURL scenario is live and 100% free, no signup. More scenarios drop every week.
Stop drawing boxes on Excalidraw. Start practicing the way you think.
System Design SandboxInteractive system design practice with AI feedback
Antonio Coppeleft a comment
What inspired you to build this? What problem were you trying to solve? How did your approach or process evolve while working on this launch? I built System Design Sandbox after bombing my own system design interview at a Big Tech company. Drawing boxes on a whiteboard felt clunky – no quick feedback, endless second-guessing on trade-offs like caching vs. sharding. Existing tools were either...
System Design SandboxInteractive system design practice with AI feedback
Antonio Coppeleft a comment
Hey PH! I'm Antonio from Toronto. I built BoreSync because I was tired of endless scrolling. My brain had no quiet time. I wanted to force boredom. But alone, it was hard. With friends, it became fun. I made the MVP today to solve the issue. I added real-time groups with Firebase. The penalty system ("You blinked!") came from beta tests. People laughed when they failed. This is not like Calm or...
BoreSyncGet bored together. No distractions. Just the void.
BoreSync is a mindfulness app. You sit with boredom on purpose. Solo or with friends. No music. No guides. Just a timer.
Join a group with a code. See who is with you live. Switch apps? Get a 10-second penalty ("You blinked!").
After, see your score (time minus penalties). Write one note. Share it.
Track stats and badges. Works offline. Add to iPhone home screen.
Built fast with AI. Inspired by digital detox. Try it: boresync.com. Who lasts longest?
BoreSyncGet bored together. No distractions. Just the void.