What runs on the phone
Almost everything. You can raise a GST invoice, record a cash or credit sale, take a payment and print a receipt, look up any party's outstanding, check live stock, enter a purchase, create a quotation, record a delivery with the vehicle number, and mark staff attendance with GPS. The interface is built for a phone held in one hand at a counter, not a desktop screen shrunk down — the item search, the quantity keypad and the share button are where a thumb reaches.
Barcode and thermal printing on the phone
The phone camera works as a barcode scanner directly in the billing screen, which for a shop with thousands of small SKUs is faster than any search. Bluetooth thermal printers are supported for counter receipts, so a two-inch printer and an Android phone are a complete billing setup for under five thousand rupees — no computer, no printer cable, no installation.
Hindi, and staff who have never used software
The interface, the printed bill and the WhatsApp messages your customers receive can all be in Hindi. That matters more than it sounds: most shops put a staff member on billing who has only ever used a register, and a screen in English is where that fails. Training someone on the app usually takes one session. Their login can be limited to billing and receipts so they never see purchase rates, profit or the ability to delete anything.
What a complete phone setup costs
A working billing counter on Android is an Android phone you probably already own, a Bluetooth thermal printer at roughly two to four thousand rupees, and the free plan. There is no computer, no software licence, no installation and no annual maintenance charge from a local dealer. If you later want A4 invoices for corporate buyers, any ordinary printer connected to the web panel handles that. Shops that start on the phone and add a computer months later keep the same account and the same data — nothing is migrated, because it was never on the phone in the first place.