100 Million Yen Scale! Video-Based Car Sales Platform

This is a used car sales web service created from scratch by a real used car dealer in Osaki City, Miyagi Prefecture using Claude Code and Codex over 196 days.

• Like TikTok, inventory car videos scroll vertically (with sound)
• Anyone can list their car for free (private sales, zero listing fees)
• When you photograph the vehicle registration certificate, vehicle information is automatically populated
• Currently operating in the actual physical store. There are also listing records from people in distant areas with no prior connection.

We have kept records of all development work with actual measurements (1.96 million lines of conversation logs with AI, 41GB, called the AI a "liar" 220 times). For more details, I wrote about it in a note article titled "How an Idol Created a Massive Platform Through Vibe Coding."