I built an offline-first Point of Sale and inventory management app specifically for Indian grocery (kirana) stores with fast billing, split payments (Cash + UPI + Credit), customer credit ledger, barcode scanning, PDF bill generation, Bluetooth thermal printing, and Google Drive backup
India has over 12 million kirana (grocery) stores. They account for 80% of retail. And most of them run on memory, handwritten ledgers, and a calculator. Not because shopkeepers don't want technology - because existing POS systems are either too expensive, require internet, or are designed for organized retail.
I built KiranaMitra for the shopkeeper who has a smartphone and nothing else.
This isn't "works offline sometimes." KiranaMitra works offline always. There is no server. No subscription. No "Sign in to continue." Open the app, start billing.
// WatermelonDB - SQLite powered, offline-first
const schema = appSchema({
version: 1,
tables: [
tableSchema({
name: 'products',
columns
KiranaMitra (किराना मित्र)
WatermelonDB was chosen over Realm or AsyncStorage because it's:
Speed is everything. A kirana shopkeeper serves 100-200 customers daily. Each bill takes 1-2 minutes max. I optimized the billing screen for:
Indian kirana stores don't just take cash. A typical transaction might be:
interface Payment {
method: 'cash' | 'upi' | 'credit';
amount: number;
}
// Bill with split payment
const bill = {
items: [...],
total: 500,
payments: [
{ method: 'cash', amount: 200 },
{ method: 'upi', amount: 200 },
{ method: 'credit', amount: 100 },
],
customerId: 'cust_123', // Required if credit > 0
};
This is the killer feature. In India, kirana stores extend credit to regular customers. "Write it in the book (khata)" is a daily phrase.
KiranaMitra digitizes this:
The credit ledger replaces the physical notebook that's been the backbone of kirana commerce for decades.
Some customers pay in advance - "Here's ₹2000, deduct from my purchases this month." The wallet feature tracks:
Print bills on a thermal printer via Bluetooth. The bill format includes:
For customers who prefer digital bills, PDF generation works offline using local rendering. Bills can be shared via WhatsApp (the primary communication channel for kirana customers in India).
No server doesn't mean no backup. The app supports Google Drive auto-backup:
The app works in English, Hindi (हिंदी), and Gujarati (ગુજરાતી). Not just labels - product names, customer names, and bill formatting all support Indic scripts.
The source code is open, but the pre-built APK is sold for ₹999 (about $12). This pricing strategy:
Built with excellence in mind
Optimized for speed & scalability
Battle-tested with real users
Responsive across all devices
Maintainable & well-documented
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