Balloon That Pops When Claude Finishes: Physical Agent UI with whisper.cpp

A developer built a desktop balloon UI that inflates as you speak a task, then floats across your screen while a real Claude Code agent runs in the background. When the agent finishes, the balloon pops with confetti and a result card. If it fails, the balloon deflates sadly.

How It Works

• Voice input: Hold a nozzle on a helium tank icon, speak a task like "Clean up my Downloads folder and sort everything into subfolders" or "make me a todo list app." The balloon inflates with your voice, and the transcript appears directly on it.
• Agent execution: When you let go, the balloon floats across the screen while a real Claude Code agent runs the task in the background. The balloon fidgets whenever the agent is actively doing something.
• Live console: Double-click the balloon to drop down a tiny console showing every thought and tool call live.
• Parallel agents: Speak multiple tasks and have several balloons floating at once, each running its own agent in parallel.
• Drag and park: Drag a balloon by its tag to park it somewhere.

Technical Details

• Transcription: Runs locally using whisper.cpp — no cloud dependency.
• Agent backend: The agents run through the Claude Agent SDK using your existing Claude Code login, so there's no setup and no separate bill.
• Licensing: Completely free and open source.

Why This Exists

The creator notes that agents still feel intimidating to most people, and "nobody is scared of a balloon." This project is the opposite end of the same idea as a physical gear shifter for switching models — making agent software feel physical.