Overview
Carried is a tiny product with real engineering inside: pick a book, write the line you would underline, stamp it with your name, and share a printable catalog-card link, with no accounts anywhere. Lines land on book pages and the home ticker live (6-8 second polling), slugs are cut deterministically from the line's own words plus a hash, and covers come from Open Library with an Internet Archive fallback and find-the-book links to Open Library, Internet Archive, Bookshop.org, and WorldCat, with no API keys anywhere. Underline voting uses anonymous device IDs stored as unique-voter sets, and the app runs in two storage modes: Upstash Redis, or an offline mode where the base64url link itself carries the line. OG cards render through satori, and the shareable card draws client-side on canvas.