Run your business.
Not your paperwork.
AtomBook is a free, open-source billing and business management app for Indian small businesses. Create GST invoices, manage customers and products, track documents, and prepare useful GST exports while keeping your data on your device.
Good morning
Here’s what’s happening in your business.
Everything your daily billing needs.
Practical tools for small businesses, without the complexity of a heavyweight accounting suite.
All your business documents
Create GST invoices, bills of supply, quotations, proforma invoices, delivery challans, purchase orders, credit notes, debit notes and payment receipts.
GST calculations made clear
Handle CGST and SGST for intra-state sales or IGST for inter-state sales, with inclusive or exclusive tax, discounts and additional charges.
Products and customers
Maintain reusable customer records and product or service items, including HSN/SAC codes, units, rates and GST rates.
Useful GST reports
Prepare GSTR-1 JSON, GSTR-3B summaries, Excel workbooks and CSV exports for review and sharing with your accountant.
Invoices in your style
Choose from document templates and adjust colours, fonts, paper size, logo placement, labels and sections with a live preview.
Payment-ready documents
Add bank details and a UPI QR generated for the invoice amount, or include your own payment QR image.
Works offline
Create and manage records without relying on a constant internet connection. Your business workflow stays available locally.
Your data stays yours
AtomBook is designed around local storage. Export backups regularly and keep a copy somewhere safe.
From setup to invoice in three steps.
Start with the essentials and add more detail as your business grows.
- 01
Install AtomBook
Download the build for your device from the releases page and complete the installation.
- 02
Set up your business
Add your business profile, GST details, customers and the products or services you sell.
- 03
Create and share
Prepare a document, export it as a PDF or report, and share it with your customer or accountant.
Useful software. No unnecessary friction.
Designed for Indian billing
GST-focused documents, tax calculations and exports for day-to-day business workflows.
Open and inspectable
The project is public on GitHub. Review the code, report issues or contribute improvements.
No subscription pressure
Use the app without a recurring software subscription or a cloud account requirement.
Good to know before you start.
Make billing one less thing to worry about.
Get started with AtomBook. Free to use, open source, and built for everyday business.