GAS RetailOS is the desktop billing and back-office system for Indian retail shops. A cashier types a few letters and the item is on the bill; F2 saves it, moves the stock and prints the receipt through a 3-inch thermal roll or an A4 GST tax invoice. Behind that counter sit the rest of the shop's day — products with an optional expiry date and a page that says exactly what is about to lapse, live stock with a movement ledger for every change, purchases and payables, customer ledgers and loyalty cards, expenses and service jobs, cash and bank books, payroll — and more than seventy reports, from the GST rate-wise summary to the trial balance and balance sheet. It runs on the shop's own Windows PC and SQL Server database, offline, at full speed, with the data staying in the shop.
Recorded in English from the shipping build, on a shop's own data: signing in, the dashboard, a bill typed at the counter with real keystrokes and a card tender, products and the new optional expiry date, the Expiring Products page, stock, purchase / purchase orders / transfers, customers and suppliers, schemes and cards, the return desk pulling up a real bill, expenses and service jobs, All Sales and deliveries, reports with live figures, the cash and bank books, the four HR pages, users / counters / settings, Backup & Recovery, the help guide and About. Jump to any chapter below the player — or open the walkthrough page for the full chapter list and a download.
The same billing engine writes the bill, the credit note and every report row — so the tax on the printed invoice is the tax in the GSTR report, a return is a negative bill that every report nets out, and the profit on a bill is the profit in the Profit & Loss. No second set of numbers to reconcile.
The same billing engine writes the bill, the credit note and every report row — so the tax on the printed invoice is the tax in the GSTR report, a return is a negative bill that every report nets out, and the profit on a bill is the profit in the Profit & Loss. No second set of numbers to reconcile.
Every save in the software — bills, purchases, credit notes, expenses, payments, vouchers and every dialog — runs behind a re-entrancy guard, and the money paths run inside transactions with row locks: a double click, a stuck key or two counters hitting the same bill cannot post the same money twice.
Bills, stock and ledgers live in SQL Server on your own PC, nowhere else. Backups are taken on a schedule and verified, the Backup & Recovery Centre warns you when one fails or grows old, and the whole shop restores from a file — or from an encrypted off-site copy — in minutes.
Two letters of an item name bring the ranked suggestions; Enter puts the line on the bill. A free-scheme combo line, the live tax summary and the card tender are all on the same screen, and F2 saves, moves stock and prints.
Two letters of an item name bring the ranked suggestions; Enter puts the line on the bill. A free-scheme combo line, the live tax summary and the card tender are all on the same screen, and F2 saves, moves stock and prints.
The shop at a glance: today's sales, bills, profit and collections, the month's target, low stock and expiries — with the tile shortcuts that also answer to F1–F10.
Every item with its prices, tax, stock and reorder point. Search, filter, edit, print or export the list; bulk-import a whole catalog with opening stock from a spreadsheet.
Price, tax, MRP, reorder level, photo and pack size — and, if your shop needs it, an expiry date with its own tick box. Untick it and the product saves with no date at all.
Choose a window — 7 to 365 days — and get product, batch, expiry date, days left, quantity and value at cost, with the money tied up totalled at the foot. Print it or export it for the shelf round.
What is on hand, what has fallen below the reorder level and what the shelf is worth — with a category filter, and every sale, purchase, transfer, audit and damage entry behind it in the movement ledger.
A supplier bill in one screen: pick the supplier, scan or type the items, and stock, cost prices and payables update together. Purchase orders track what was ordered and what is still pending.
Pull in the original bill or add the items by hand; every line says whether this customer bought it and when. Credit the account or refund the money, and the credit note reverses stock and tax by itself.
The full history: every bill, filterable by date, customer, counter and user — with reprint, export and the e-Way / e-invoice desk beside it for transport documentation.
Taxable value and the central and state tax, computed by the same engine that created the bills — and the same figure you will see in GSTR-1 and GSTR-3B.
Staff, attendance and leave, then the month's payroll — which posts the wages to the books as an expense voucher so the accounts and the salary sheet agree.
Scheduled, verified backups with the health warning in plain words: whether the backup is on, the last attempt succeeded, how old it is, and whether a copy exists off this machine.
Windows with the .NET Framework 4.8 runtime and SQL Server — a free SQL Server Express on the counter PC is enough, or a server on the shop's LAN if several counters and managers share the data. Barcode scanners, 3-inch thermal receipt printers and ordinary A4 printers all work through the Windows drivers you already have.
Windows with the .NET Framework 4.8 runtime and SQL Server — a free SQL Server Express on the counter PC is enough, or a server on the shop's LAN if several counters and managers share the data. Barcode scanners, 3-inch thermal receipt printers and ordinary A4 printers all work through the Windows drivers you already have.
One script creates the database — or upgrades an older one in place, because it is re-runnable and every schema change since the first version applies itself. Install the app, sign in as the administrator, put in your shop details, logo, tax rates and counters, and load your products by spreadsheet. A day of typing, and the counter is live.
The licence activates once from our licence server and is validated offline afterwards, so a shop with no internet still bills all day. Updates are pushed as vendor-signed packages: the app verifies the signature and hash, takes a backup, applies the update and rolls back if anything fails. Your bills and stock are never in the way of an update.
The download runs as a full-feature demo before a key is entered — every screen, every report. It is enough to bill a real day, run a real report and show the accountant.
The download runs as a full-feature demo before a key is entered — every screen, every report. It is enough to bill a real day, run a real report and show the accountant.
A licence key comes from our own licence server, signed and bound to the shop's machine. It is checked offline, and renewing it extends the date without touching your data. Thirty days before expiry the app warns at startup and the status strip turns red — never a surprise on a busy morning.
Pricing depends on the counters and the modules you take — billing alone, or the whole back office with accounts, HR and payroll. Tell us how the shop runs today and we will quote for it; setting it up with your products, tax rates and printers is part of the job.
GAS RetailOS is built by Graphical Art Studio — a business-software studio in Kolkata making software for hotels, restaurants, repair shops and retailers. It is a Windows desktop product on SQL Server, developed and supported by Mukesh Patra.
GAS RetailOS is built by Graphical Art Studio — a business-software studio in Kolkata making software for hotels, restaurants, repair shops and retailers. It is a Windows desktop product on SQL Server, developed and supported by Mukesh Patra.
Questions about setup, licensing, a report your accountant wants, or a guided installation — reach the studio directly.
No. Billing, stock, accounts and every report run on the shop's own PC and SQL Server database with the line down. Internet is needed only to activate or renew the licence, to check for and pull an update, and for the optional cloud copy of your backups.
No mock-ups — these are screens from a working shop database.
No. Billing, stock, accounts and every report run on the shop's own PC and SQL Server database with the line down. Internet is needed only to activate or renew the licence, to check for and pull an update, and for the optional cloud copy of your backups.
Windows with the .NET Framework 4.8 runtime — Windows 10 or 11, or the Windows the shop already has — and SQL Server, where a free SQL Server Express on the counter PC is enough. For several counters and the owner's machine, one of them (or a small server on the shop's LAN) holds the database and the rest connect to it.
Yes, the filing papers, not the portal login. A GST tax invoice with GSTIN, HSN and the CGST / SGST / IGST split stored per invoice; the rate-wise and HSN summaries; GSTR-1 export as the portal's CSV; and GSTR-3B. Your accountant files it — the software's job is to make the numbers add up to the bills.
No — the expiry date is optional by design. Leave the tick box off and the product saves with no date, the Expiring Products page stays quiet, and nothing else in the software changes. If you later want it for a few items (or all of them), tick the box on those products and the page starts answering for them.
Yes. Counters are configured with their own sites and their own bill numbering, so two tills on the shop's network bill at the same time without colliding, and the day close reports each counter separately. Users and roles decide who may see the accounts, the payroll or the settings — screen by screen and action by action.
In your own SQL Server database on your own machine — not with us. Backups run on a schedule and are verified, the newest copies are kept in a folder you can open from the app, the Backup & Recovery Centre tells you plainly if a backup failed or grew old, and the whole shop can be restored from a file (or from the optional encrypted cloud copy) in minutes. A lapsed licence never blocks backup or your data.
Yes — anything Windows can print to. Receipts come out on a 3-inch thermal roll (with an optional second copy for the shop marked clearly), on 4-inch, or as an A5 / A4 GST tax invoice; reports print on plain paper. Barcode scanners that type like a keyboard work with no setup, and the software can print its own Code 39 labels for the items that have no barcode.
Install it and run it without a key: three days of the full product. Or send an enquiry and we will set up a trial with your own products, tax rates and printers, and walk your cashier through the counter.
Send a few of your product lines and we will walk you through billing, stock and the GST reports on your own data.
