100% offline Windows billing & inventory software for Indian retail shops
MargPOS Desktop is a complete, 100% offline Windows application for retail billing, inventory, and business management — built for shops that need software with zero internet dependency. Unlike most modern billing tools that call themselves "offline-capable" but still rely on a cloud server, MargPOS Desktop is architecturally different: the application, its database, and every core function run entirely on the shop's own computer. All data is stored locally in an embedded SQLite database — no cloud service, no subscription server, no internet connection required for daily operation. Key Features: Barcode and QR code scanning (USB scanner + camera), covering manufacturer-printed barcodes and QR codes Fast POS billing with cart management, multiple payment modes (Cash, UPI, Card, Credit/Udhaar, Split Payment) GST Tax Invoice and thermal receipt printing (58mm/80mm), plus WhatsApp invoice sharing Full inventory management with purchase entry, low-stock alerts, and barcode label printing Sales and Purchase Returns with automatic stock adjustment and Credit/Debit Note generation Digital customer credit ledger (Udhaar Khata) with payment tracking and WhatsApp reminders PIN-based multi-user login with Owner/Staff role-based access control Complete GST compliance engine — both Regular (Tax Invoice) and Composition Scheme (Bill of Supply) modes, GSTR-1 style reporting, HSN summaries One-click local database backup/restore Hardware-locked licensing system with trial and paid activation key generation — ready to license out to your own future customers The software is currently installed and in active daily use by a real retail shop, and has gone through multiple rounds of testing and refinement. This is a full source code and ownership transfer — the buyer receives complete rights to rebrand, resell, license to shop owners, or extend the software as they see fit. Built with Electron, React, TypeScript, and SQLite — a modern, maintainable stack. Reason for selling: I run a freelance web development business and don't currently have the bandwidth to properly scale and support this as its own product.
Next step: <p>The buyer can:</p><p>- License and distribute this software to retail shop owners as a paid product, using the included offline licensing system to issue activation keys</p><p>- Add cloud-sync capability for shops with multiple branches wanting centralized reporting</p><p>- Add support for other regional tax systems to expand beyond the Indian market</p><p>- Integrate hardware like receipt printers or barcode scanners more deeply, or add a companion mobile app for remote sales monitoring</p><p>- Build a reseller/franchise network, similar to how established players like Marg ERP and Busy distribute through local dealers across India</p>
For sale
Asking price: $2,500 USD
What's included
Source code, All related design work, All related data
Also includes the offline license key generation system (Generate-Key.bat), which lets the buyer issue activation keys to their own future customers without any server dependency.
Reason for selling
I am busy with other things and no longer have time to maintain this project.
Project metrics
Average Monthly Revenue: Pre-revenue
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