Inspectable source code
Open-source software lets technical users inspect how the app works, review privacy assumptions, and contribute improvements.
Open-source billing
Open Source Invoice Software for Small Businesses
Invoiso is free invoice software with source code available on GitHub. It gives small businesses a transparent desktop billing option for PDF invoices, customer records, product management, payment tracking, and local data ownership.
Local-first data model
Invoiso is built for desktop use with local data storage, which is useful for businesses that do not want invoices tied to a hosted account.
Customizable foundation
Developers can fork, study, and adapt the code for specialized workflows, custom templates, or internal business needs.
What Invoiso includes
- PDF invoice and quotation generation
- Customer and product management
- GST fields and UPI QR support
- Payment tracking and receipts
- Backup and restore workflows