Vertumnus
Printable posters showing what's in season at farmers' markets
Visit vertumnus.fyi ↗What is Vertumnus?
Vertumnus generates customizable printable posters displaying seasonal produce availability at farmers' markets in your region. The tool uses USDA shipment data to show week-level granularity across the year, helping shoppers plan visits and know what to expect. Currently available for the San Francisco Bay Area and New York, with region-specific data sources.
The maker built this project with Claude Opus 5 through a single 731-prompt session, exploring how AI coding tools handle extended development workflows. The site includes a searchable transcript of the entire build process and analysis of what the AI excelled at and where it struggled.
Momentum
Daily activity over the last 30 days: upvotes, unique visits, new GitHub stars and Hacker News points.
How do we know it's vibe coded?
vibetrend discovered Vertumnus automatically. Evidence: HN post: "The project was coded in a single 731 prompt Claude Opus 5 session over 22 days". View source.
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