The problem
What gets in the way
Billing by hand means writing the same customer, tax and stock details again for every sale, then chasing who has paid and what is left on the shelf.
Billing software for small businesses in India
Invoices, taxes, payments owed and stock, in one app on your phone instead of notebooks and spreadsheets.
How Zenocta helps
3 apps, one job
Instobill, Bill and Invoice Maker create GST invoices in a few taps and share them as PDF. Instobill and Bill also track payments, receivables and stock, and Bill adds point of sale for the counter.
Apps for billing and invoicing
Live on Google Play for Android, with a web version where marked. Open an app to see screenshots, features and its privacy policy.
Free to startInstobill
Billing and inventory
Invoicing, billing and stock management for shops, wholesalers and small businesses in any country. Clean, fast and built to cut the manual work out of your day.
- Android
- Web
Free to startBill
Invoice, GST, VAT and tax
Invoicing, point of sale, inventory and optional accounting for small and medium businesses in any country, with GST, VAT and sales tax support, on Android and the web.
100+ installson Google Play- Android
- Web
Free to startInvoice Maker (Zen GST)
GST invoicing
GST-compliant invoicing for small businesses. Create and share invoices in a few taps.
- Android
What you can do
Highlights from the apps’ own Google Play listings.
Instobill
Tax and currency for your country
- Pick your country and currency: about 200 countries and 140 currencies
- Tax presets as a starting point: India GST (CGST, SGST, IGST), UK, EU and UAE VAT, Canada, Australia, Singapore, US sales tax and more
- Not on the list? Use Custom tax with your own named rates, tax-inclusive or exclusive prices
Bill
Invoice maker and documents
- Tax invoice, proforma invoice, quotation, estimate, credit note, debit note, delivery challan and purchase order
- 25 invoice templates plus thermal receipt (58 and 80 mm) and A5 layouts
- Logo, signature, stamp, accent colour and your own custom fields
Invoice Maker (Zen GST)
Invoicing basics
- GST and non-GST billing support
- Download invoices as PDF and share via WhatsApp or email
- Offline invoicing with auto-sync when online
Instobill
Invoices and documents
- Invoices, quotations, proforma invoices, sales orders, delivery challans, credit notes and debit notes
- Turn a quotation into an invoice in one tap
- Five PDF templates and your own terms; share the PDF or print it
Bill
Get paid
- Record full or partial payments, see balance due and payment history
- Paid, partial, unpaid and overdue status, payment reminders and receipts
- Customer ledger with a statement you can share, plus khata entries
Instobill
Get paid
- Record full or partial payments and see what each customer owes
- Receivables with ageing, customer statements you can share
- Payment status on every invoice
Guides worth reading
3 Jul 2026 · 16 min readGST Billing App for Small Business: Fix Invoicing ErrorsStill calculating GST by hand or wrestling with spreadsheets every billing cycle? Here's why manual invoicing breaks down and what actually fixes it.
8 Jul 2026 · 17 min readGST Billing Software for Small Business: End Invoice ErrorsManual GST invoices cost Indian businesses hours every week and invite compliance headaches. Here's why, and how a smarter billing app fixes it.
17 Jul 2026 · 17 min readRetail Billing & Inventory Management Software for Small StoresPaper bills and Excel stock sheets feel free until they cost you a sale, a customer, or an afternoon. Here is a more reliable way to run a retail shop.- 21 Jul 2026 · 17 min readBilling and Inventory Management Software for Small RetailersHandwritten bills and stock registers quietly cost small shops money every day. Here is why that happens, and how one mobile app fixes billing, stock, and reporting together.
Proof from real work
“Instobill has revolutionized our billing and inventory workflow. It’s clean, responsive, and has significantly reduced our manual effort. We save hours every week, and the support team at Zenocta Solutions has been consistently helpful and quick to respond. A fantastic solution for growing businesses.”
Case studyInstobillA mobile-first app designed for small businesses, providing seamless management of inventory and billing processes.Billing and invoicing: common questions
Answers are taken from what the apps’ listings say.
Can I make GST invoices on my phone?
Yes. Bill supports India GST in full: CGST, SGST, IGST, GSTIN, HSN codes and amount in words. Invoice Maker creates GST and non-GST invoices with automatic CGST, SGST and IGST calculation, and you can share the PDF on WhatsApp or email.
Do these billing apps work outside India?
Instobill and Bill let you pick your country and currency (around 200 countries and 140 currencies) and set GST, VAT or sales tax. The tax rates are starting points that you can review and change, so check them with your accountant.
Can I manage stock as well as invoices?
Yes. Instobill covers products, barcode and QR scanning, low-stock and expiry alerts, several locations and stock counts. Bill adds point of sale with thermal receipt layouts for the counter.
Where can I get these apps?
Instobill, Bill, Invoice Maker (Zen GST) are live on Google Play for Android. Instobill, Bill also run in your browser. Open any app page here for the Play link and web link.
Need it customised for your business?
We can change the name, logo, colours, features and workflow of an existing app, or build something new. Tell us what you need and you will get a scoped, fixed-price proposal within 24 hours.
Let’s solve billing and invoicing together
Website and app development from ₹8,888. Book a free consultation and get a scoped, fixed-price proposal within 24 hours.