Dev's Yesterday weather app shows vibe coding turned personal software into a default
genmon · x · 2026-09-19
Developer genmon shipped Yesterday, a minimal iPhone app that just compares today's weather to yesterday's (dashed line + diff arrows) with an AI-generated plain-text summary via Apple's built-in LLM and free WeatherKit data. The telling part: when he invited friends to try it, they replied that they'd already vibe-coded their own perfect weather apps. His takeaway: software has changed forever — apps are shifting from made-for-everyone to made-for-you-and-your-family.
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