Vibe Coding

Tip: Vibe Code macOS Apps Without Knowing Swift — Local LLMs on M5 128GB

Simon Willisonmedium signal

Simon Willison (March 27) demonstrates building two macOS menu-bar apps (Bandwidther for network monitoring, Gpuer for GPU stats) using Claude Opus 4.6 and GPT-5.4 without knowing Swift or opening Xcode. Key enabler: SwiftUI apps can fit in a single file, which keeps the full app within an LLM's context window. The new 128GB M5 MacBook Pro runs local LLMs fast enough for rapid iteration. Willison calls this 'classic vibe coding' — zero language knowledge, minimal code review, functional production tools.

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