Qistas AC — store and accounting system

What it is

Qistas AC is a Windows desktop application I built for shop owners who wanted to leave paper-based bookkeeping behind without committing to a full ERP. It runs on a single PC at the counter and covers the everyday parts: items, sales, invoices, suppliers, customer accounts, and end-of-day reports.

What it handles

• Inventory — items with prices, stock levels, and low-stock alerts.
• Sales and invoices — generate invoices, record payments (cash or on account), and track outstanding balances.
• Customer and supplier accounts — transaction history per account, with simple receivables and payables tracking.
• Basic accounting — profit and loss summaries and sales-by-period reports, exportable for the accountant.

Notes on the build

The app was designed for shops where one or two people operate the system, so the UI prioritizes keyboard shortcuts and quick item search over visual polish. Data lives in a local database on the same machine, with backup to an external drive.

I worked directly with the first shops using it, so most of the workflow choices came from watching how cashiers actually entered sales and what slowed them down.