One-prompt GPT-6 build: offline speedometer app in 46 minutes, within 3km/h of dash gauge
CHIM3RA-Z3RO · reddit · 2026-10-18
A Reddit user vibecoded an offline GPS speedometer for an old prepaid Android phone using a single prompt to GPT-6 (Astra, high effort), completed in 46m11s. Real-world testing shows readings within 3km/h of the car's dashboard needle—comparable to Google Maps' speedometer—fully offline. The motivation was putting a dormant unlocked phone back to use.
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