QSekai, the offline card-show checkout

Field notes

QSekai assigns persistent QR labels to individual cards, then records scans, sales, purchase costs, margins, and the show associated with each transaction. Its central operating constraint is offline use: the page says stock remains on the device and syncs to other devices when a connection returns. The pricing includes a free 25-item tier, a €7.99 72-hour Show Pass, and printer support spanning named brands such as Brother, Rollo, Munbyn, Dymo, and Zebra.