Billing & invoice software
Create a professional GST invoice in seconds, download the PDF, and know exactly who still owes you money.
Ready-made billing runs on a monthly subscription. A system customised to how your business actually bills is quoted as a fixed one-time price before we start.
The problem this solves
Handwritten bill books and half-broken Excel sheets cost real money — forgotten dues, wrong totals, no record of what a customer bought last month. Billing software fixes that, but most of it is built for accountants, not for a shopkeeper with two minutes and a customer waiting.
What you get
- GST-ready invoices with your business details and logo
- PDF download and instant WhatsApp share
- Saved customers and saved items — no retyping
- Payment tracking, including part payments and pending dues
- Per-customer pricing and discounts where you need them
- Sales history you can actually search
- Optional: AI that reads purchase bills into entries instead of you typing them
Who this is for
- Distributors and wholesalers billing many retailers
- Shops and service businesses issuing daily bills
- Anyone still using a paper bill book
What we've actually shipped
Real businesses running on work we built — not a portfolio of mockups.
We run our own invoicing product, so the billing engine is real software in daily use, not a mockup.
We've already built a custom billing system for a sales agency — crate and bag units, per-customer rates, part payments, printed bills.
Frequently asked questions
Is the invoice GST compliant?
Yes — GSTIN, HSN, tax breakup and totals are handled. Tell us your tax setup and we configure it for your business.
Can I use it on my phone?
Yes. It's built mobile-first, so you can bill from a phone at the counter or on a delivery route.
Can it handle different prices for different customers?
Yes. Per-customer rates and discounts are supported — this is essential for distributors, and we've already built exactly this for a live business.
Do I need internet?
Yes, our billing runs online so your data is safe, backed up and reachable from any device. If you need something that works without a connection, tell us and we'll scope it separately.
How We Deliver Your Software Project
A transparent, 5-stage engineering lifecycle from requirements discovery to live production deployment in Surat.
Scope & Workflow Audit
We review your actual day-to-day operations, counter checkout routines, and catalog complexity to produce a fixed-scope technical specification.
Dedicated Schema Architecture
We configure an isolated PostgreSQL schema dedicated exclusively to your business. Zero shared tables or competitor data leaks.
Offline-First App Engineering
We develop native Flutter Android apps with on-device SQLite/Hive caching so your staff and customers experience sub-50ms instant interactions.
Hardware & Counter Integration
We connect your billing counter hardware: 58mm/80mm ESC/POS Bluetooth thermal receipt printers, USB barcode guns, and cash drawer triggers.
The Rupix Merchant Autonomy Guarantee
Unlike aggregators that lock your customer database into proprietary silos and charge 15% to 30% take-rates, Rupix operates on complete data sovereignty. You own your customer phone numbers, transaction histories, and Google Play developer console listings 100%. All customer payments route directly into your own bank account via UPI with zero commissions.
Other things we build
Get a fixed quote for billing & invoice software
Tell us about your business. We'll reply within 24 hours with an honest assessment and a fixed price — zero surprises.