InvoiceHub — Offline GST Billing Android App

The problem

Billing shouldn't need a signal.

Cloud billing apps stop working the moment the network does — at a site office, a godown, a delivery point. And they charge every month for data you already own. InvoiceHub keeps the entire system of record on the device: instant, private, and yours. Backup and restore was built in from day one, because it's the only copy.

What's inside

A real tax invoice,
not a receipt.

Compliant GST invoices, correctly calculated

Same state as the buyer splits into CGST and SGST; different state applies IGST — worked out automatically from the state codes. Every invoice carries an HSN-wise tax summary, an explicit round-off, and the amount in words in Indian lakh-crore numbering.

Bill To and Ship To blocks, with GSTIN on each

Per-line "rate includes GST" toggle for MRP-style pricing

Bank details and declaration block, omitted if left blank

Bill now, invoice later — in bulk

Create bills as you sell; they stay fully editable. Then, once a month when you're filing, open Generate GST Invoices, tick the bills you need, and stamp them all at once. Numbers are allocated strictly in bill-date order, so the sequence is clean and gap-free.

Pending and Issued tabs with live count badges

Configurable prefix and starting number for migrations

Issuing locks the bill — no silent edits to a tax document

Share the PDF, or export the whole month

Any invoice renders as a real A4 PDF you can print or send. When your accountant wants the lot, select a month's worth and export a single zip — one PDF per invoice plus a GST summary sheet listing taxable value, CGST, SGST, IGST and totals.

Share to WhatsApp, email or any app that takes a file

Summary as CSV — opens straight in Excel or Sheets

Your logo embedded on every invoice

Backups that survive a lost phone

Because there's no cloud copy, backup is a first-class feature. Turn on automatic daily backup and the app writes a timestamped copy into a folder you choose — deliberately outside app storage, so it survives an uninstall. The last fourteen are kept; older ones are pruned.

Backup time is yours to set

Manual export any time to a file you control

Restore reloads the app cleanly so nothing stale lingers

Made yours

Your business, your app.

Each install is fully self-contained — your logo, your invoice prefix, your product masters.

Building material yards

Cement, sand and steel billed by bag, ton and load — often with no signal at the yard.

Small traders

A one-person business that needs proper GST invoices without a Tally licence or a subscription.

Field sales

Invoice at the customer's premises on a tablet, share the PDF on WhatsApp before leaving.

Service providers

SAC-coded service billing with the same HSN-wise summary and amount-in-words output.

Available on

A genuinely native app — this one isn't a web wrapper.

Android — NativeWritten in Kotlin with Jetpack Compose. Adapts from phone to tablet with a side navigation rail on larger screens. Tablet readyLayouts cap and centre their content on wide screens instead of stretching edge to edge. iOS — on requestAn iOS version would be a separate native build. Talk to us about scope if you need both platforms.