Complete POS and inventory management system for shops and stores

Complete POS and inventory management system (Offline-First / Firebase) for shops and stores.

📝 Overview:
Looking for a professional, secure, and fast POS and inventory management system for a supermarket, retail shop, or multiple points of sale?
I offer Apex POS Pro, a complete web-based system built with modern technologies to smoothly manage sales, invoices, inventory, and financial reports. It supports fully offline operation (Offline-First), with instant cloud synchronization to Firebase as soon as a connection becomes available. It also supports multiple stores and roles and permissions (admin, inventory manager, cashier).

Base service price ($5): Includes the main screen, cart management, and quick sales (POS), with the store connected to a Firebase database and offline mode enabled.

(You can customize the system and add the advanced features and screens you need through the service add-ons below.)

🛠️ Included in the base service ($5):

Main cashier screen (POS): Fast sales by barcode or search, automatic discounts, and thermal receipt printing.

Offline engine (100% Offline-First): Immediate local storage of sales and inventory in the browser (IndexedDB), with the system fully functional offline.

Full cloud integration (Firebase): Automatic background synchronization as soon as a connection is available.

Multi-store system (Multi-Tenant): Dedicated login for each store using a secret code, with complete isolation of each store’s data.

Delivery and setup: The system is ready to run and use directly on the web.

➕ Service add-ons:

📦 Inventory and product management screen ($5): Add and edit products, track quantities, set low-stock thresholds, and receive alerts for products nearing sell-out.

📊 Reports, profits, and charts screen ($5): Instant daily and monthly sales statistics, net profits, and best-selling items, with interactive charts.

🔐 Multiple roles and permissions ($5): Restrict cashier permissions (hide inventory and reports; block discounts and invoice deletion unless the admin password is entered).

⏸️ Invoice hold and returns management ($5): Hold and retrieve an invoice with one click, search past invoices, and automatically return items to inventory.