Sokubai - Doujin Booth POS

Sokubai is a booth POS, cashier, and inventory app for doujin events, comic markets, artist alley, conventions, and craft fairs. Tap a product card to add it to the cart, calculate change instantly, and keep your inventory in sync — everything works offline so it stays reliable even on crowded venue Wi-Fi. ■ Key Features 【Tap-to-Sell】 - Pre-register products with name, price, and image - Tap a product card to add it to the running total - See cart line items at a glance 【Instant Change Calculation】 - Quick cash-received presets (exact / next $5 / next $10 / next bill) — no payment processing, just fast cash-tendered input - Large change display so any volunteer cashier can handle the line 【Inventory Tracking】 - Set the number you brought; remaining stock auto-decrements - Sold-out items are automatically grayed out 【Sales History & CSV Export】 - Per-transaction history with timestamps - Export as CSV for accounting or post-event analysis 【18+ Age Verification (Optional)】 - Adult-content products show a seller-side confirmation checkbox 【Fully Offline】 - All features work without an internet connection - Local data persistence keeps your event safe even if Wi-Fi drops 【Multi-Day Event Support】 - Presets for "Today only / Sat-Sun / 3-day" events ■ Built For - Comic Market (Comiket), COMITIA, Game Market, and other doujin events - Artist Alley sellers at conventions - Flea markets, craft fairs, school festivals, hand-made events - Food trucks and small pop-up stands ■ Designed Around Real Pain Points Sokubai is built to address common complaints with existing register apps: hidden running totals, slow bill-combination entry, and the lack of direct amount input. Available on iPhone and iPad. Item data sharing between devices (cashier + helper) is planned for a future update. We welcome feedback through App Store reviews or support email.