Our product · Free and open source
CrizaVoise: billing software that works offline
CrizaVoise is a free, open-source desktop app for making invoices and bills, made by Criza Labs. Shops, freelancers and small businesses use it to create GST-ready PDF invoices, quotations and receipts, print on 58 mm and 80 mm thermal printers, track payments and stock, and share invoices on WhatsApp. It runs fully offline, so the data stays on the user's own computer, and there is no subscription, trial or sign-up.
At a glance
- Price
- Free. No trial, subscription, licence key or ads
- Licence
- Apache License 2.0
- Works
- Fully offline, data stored on your computer
- Platforms
- Windows, Linux and macOS
- Languages
- 8, including Hindi and Gujarati
- Version
- 1.0.0, released 10 November 2026
What it does
Version 1.0.0 covers the everyday billing work of a small shop or service business.
Bills in seconds
A quick bill for walk-in customers, product quick codes (type R5 and press Enter), product photos and voice typing in search.
GST-ready documents
PDF invoices, quotations, receipts and credit or debit notes with GSTIN, HSN or SAC codes, per-item or overall tax and a UPI QR code.
Thermal receipts
Prints on 58 mm and 80 mm ESC/POS receipt printers over USB or the network, as well as full-page A4 PDFs.
Getting paid
Share an invoice on WhatsApp with a ready message, send payment reminders, and track payments, the cash and UPI ledger and reports.
Stock and suppliers
Customers, products, stock levels, purchase bills, suppliers and returns, with CSV import and export.
Your data stays yours
A local SQLite database with built-in backup and restore. No account, no server and no tracking.
See it
Screens from the app, showing sample customers and figures.
Who it is for
- Retail shops and kirana stores that need fast counter billing and thermal receipts
- Small businesses and traders in India that need GST invoices with GSTIN, HSN or SAC and UPI QR codes
- Freelancers and service businesses that send quotations and invoices as PDFs
- Anyone who wants billing software without a subscription, the cloud or a sign-up
- Developers who want a Flutter desktop codebase to learn from or build on
What it does not do
So you can decide before you install it.
- It does not connect to the government's Invoice Registration Portal, so businesses that must e-invoice need to generate the IRN separately.
- The installers are not code-signed yet, so Windows and macOS show a warning the first time you open them.
- Gujarati and Hindi conjunct letters may not join correctly in PDFs, so check a real invoice before relying on it.
Open source, with credit
CrizaVoise is released under the Apache License 2.0. Anyone may use, change and share it, including commercially. A fork must keep the LICENSE and NOTICE files and show the line below in its README and About screen, and use its own name and logo.
Based on CrizaVoise by Criza Labs (https://criza.dev)
CrizaVoise started from Invoiso, an MIT-licensed billing app by Anoop P. We rebuilt and extended it, and its notice is kept in the app and in the repository's third-party notices. See Invoiso on GitHub.
Built with
- Flutter
- Dart
- Riverpod
- SQLite
- pdf and printing
- Inno Setup
- GitHub Actions
Need something else? See everything we use and what we can learn for your project.
Guides on voise.criza.dev
Need something CrizaVoise does not do?
We can extend it, connect it to your accounts or stock systems, or build billing software around how your business works, at a fixed price agreed in writing.
Questions about CrizaVoise
What is CrizaVoise?
CrizaVoise is a free, open-source invoicing and billing app for Windows, Linux and macOS, made by Criza Labs. It makes GST-ready PDF invoices, quotations and receipts, prints thermal receipts, and tracks customers, products, stock, payments and suppliers, all offline.
Is CrizaVoise really free?
Yes. There is no price, trial, subscription, licence key or ads. The source code is under the Apache License 2.0, so businesses can also use it commercially.
Does it work without the internet?
Yes. All data is stored in a local SQLite database on your computer, and nothing is sent to a server. Back it up from Settings, Backup, and keep the copy somewhere safe.
Can it make GST e-invoices with an IRN?
No. CrizaVoise works offline and does not connect to the Invoice Registration Portal. It makes GST tax invoices, and businesses that must e-invoice generate the IRN through the portal or their accounting provider.
Can I fork it or use the code in my own product?
Yes, under the Apache License 2.0. Keep the LICENSE and NOTICE files, credit "Based on CrizaVoise by Criza Labs (https://criza.dev)" in your README and About screen, and give your version its own name and logo.
Can Criza Labs build a custom version for my business?
Yes. We can add features, connect it to your other systems, or build a white-label version or a billing system made for your business. Tell us what you need and we will give you a fixed quote.