GST Billing Invoice - Offline

Sevvanam

About this app

⚠️ DISCLAIMER: This app is not affiliated with, endorsed by, or associated with the Government of India, the GST Council, or any government entity. It is an independent tool to help businesses create invoices that follow GST rules.

GST Billing is a simple, offline-first invoicing app built for small Indian businesses. Create tax invoices, generate professional PDFs and share them with clients — all from your phone, with no internet connection and no account required.

Your data stays on your device.

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GST-COMPLIANT INVOICES
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• Automatic CGST/SGST split for intra-state sales and IGST for inter-state sales — based on place of supply
• Financial-year invoice numbering (INV/2026-27/0001) that resets every April
• GSTIN format validation with check-digit verification and state-code checks
• Paise-level rounding — all amounts stored and computed as integer paise

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PROFESSIONAL PDF OUTPUT
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Each invoice generates a clean PDF with:
• Line-item table with HSN codes, quantity, rate and GST rate
• HSN-wise tax summary per slab
• Taxable amount, CGST/SGST or IGST totals and grand total
• Amount in words
• Reverse-charge declaration and authorised signatory block
• "ORIGINAL FOR RECIPIENT" label

Share the PDF directly to WhatsApp, email, or any other app in one tap.

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MANAGE YOUR BUSINESS
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• Business profile with your GSTIN, address and state code
• Client registry — store buyer details and GSTIN for quick invoice creation
• Item catalogue — save products and services with HSN code, price and default GST rate
• Historical integrity: prices, names, HSN codes and taxes are frozen on each invoice so future catalogue edits never alter issued invoices

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OFFLINE & PRIVATE
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• Works completely offline — no server, no cloud account, no subscription
• All data lives in a local SQLite database on your device
• One-tap backup: export a consistent database snapshot and store it wherever you like
• Included in Android's Auto Backup so data transfers to a new phone automatically

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PERFECT FOR
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Freelancers, consultants, traders, small shops and any GST-registered business that needs to issue tax invoices quickly without complex accounting software.

No ads. No subscription. No data sent anywhere.

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OFFICIAL GST INFORMATION SOURCES
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The GST rules implemented in this app are based on publicly available government publications. For authoritative and up-to-date information, refer to:

• GST Portal (Government of India): https://www.gst.gov.in
• Central Board of Indirect Taxes and Customs (CBIC): https://www.cbic.gov.in
• CBIC – GST Acts & Rules: https://www.cbic.gov.in/entities/gst

This app does not provide legal or tax advice. Consult a qualified CA or tax professional for compliance guidance specific to your business.

What’s new

Release Notes - Version 1.0.13
Improvements & Fixes