How much is Invoice Builder: Open-Source Invoicing App?

Invoice Builder: Open-Source Invoicing App is listed for sale at $15,000 USD.

Invoice Builder: Open-Source Invoicing App - Sell Project

Listed September 16, 2026

About Invoice Builder: Open-Source Invoicing App

Offline invoicing with customizable PDFs and Peppol e-invoicing support.

Invoice Builder is an open-source, offline-first invoicing and quoting application for freelancers and small businesses. It provides cross-platform desktop support through Electron, self-hosted web deployment with Docker, SQLite and PostgreSQL backends, customizable PDF generation with a visual drag-and-drop layout builder, receipt printing, multi-language support, and standards-aligned UBL 2.1, Peppol BIS Billing 3.0, and XRechnung XML export. The project includes extensive documentation, database migrations, automated builds, release workflows, and active development.

Project details

Website: https://github.com/piratuks/invoice-builder

Next step: Potential opportunities include:<ol><li data-list="bullet">Launching a hosted cloud version with managed backups, team accounts, and synchronization</li><li data-list="bullet">Offering paid support, onboarding, custom deployments, and maintenance plans</li><li data-list="bullet">Adding premium invoice and quote templates, layout packs, and branding features</li><li data-list="bullet">Expanding Peppol, e-invoicing, tax, and country-specific compliance integrations</li><li data-list="bullet">Improving mobile and tablet workflows</li><li data-list="bullet">Building integrations with accounting, payment, banking, CRM, and e-commerce platforms</li><li data-list="bullet">Introducing optional paid features while keeping the core application open source</li><li data-list="bullet">Growing the Docker/NAS/self-hosting audience</li><li data-list="bullet">Building a contributor, plugin, and template ecosystem around the visual layout builder</li></ol>

For sale

Asking price: $15,000 USD

What's included

Source code, All related data, All related design work

The sale includes the GitHub repository, source code, complete commit history, documentation, releases, issues, project configuration, Docker files, CI/CD workflows, screenshots, application icon, layout examples, and other project assets stored in the repository. Where technically and legally transferable, the buyer will also receive the official project identity, release configuration, GitHub Actions setup, Docker/GHCR publishing configuration, and a reasonable technical handover period. No domain, Twitter/X account, email account, customer database, personal user data, or private analytics account is included. GitHub Container Registry packages and deployment credentials will be transferred separately only where technically and legally transferable. Third-party dependencies remain subject to their respective licenses. The asking price reflects the project’s existing functionality, technical complexity, documentation, release infrastructure, community traction, and the estimated engineering time and cost required to independently replicate the product and its distribution setup. The price is negotiable for the right buyer.

Reason for selling

I am busy with other things and no longer have time to maintain this project.

Project metrics

Average Monthly Revenue: Pre-revenue