Open Source Invoicing & Finance Apps
Discover the top open source Invoicing & Finance software to manage billing, expenses, payments, and accounting. Take control of your finances!
Apps in Invoicing & Finance
Language
License
Akaunting
Invoicing Finance
Open-source online accounting for small businesses and freelancers — invoices, expenses, and reporting without monthly fees or vendor lock-in.
Invoice Ninja
Invoicing Finance · Project Management
Self-hostable invoicing, time-tracking, and multi-gateway payment platform for freelancers and small businesses, with built-in e-invoicing compliance for EU and global standards.
ERPNext
ERP · Invoicing Finance
100% free, open-source ERP unifying accounting, manufacturing, inventory, CRM, HR, and POS in a single self-hostable platform.
Kimai
Invoicing Finance · Project Management
Professional open-source time tracking with invoicing, multi-user support, SAML/LDAP auth, and a full REST API—self-host it or use the cloud.
Actual
Invoicing Finance
Local-first personal finance with envelope budgeting, end-to-end encryption, and multi-device sync — no subscription required.
Ghostfolio
Invoicing Finance
Track your stocks, ETFs, and crypto with a privacy-first, self-hostable wealth management platform built for data-driven investors.
Bigcapital
Invoicing Finance
Self-hostable double-entry accounting platform with invoicing, inventory, multi-currency, and real-time financial reporting for small and medium businesses.
Polar
Developer Tools · Ecommerce · Invoicing Finance
Open source payments infrastructure that turns software into a business — subscriptions, usage-based billing, digital products, and merchant-of-record compliance in one platform.
Lago
Ecommerce · Invoicing Finance
Open-source metering, billing, and revenue infrastructure for product-led companies that need complete control over their pricing stack.
Formance Ledger
Databases · Developer Tools · Invoicing Finance
The programmable open source core ledger for fintech — build money-moving applications with atomic multi-posting transactions, account-based modeling, and Numscript, a built-in DSL for financial logic.
ezBookkeeping
Invoicing Finance
Lightweight self-hosted personal finance manager with AI receipt scanning, multi-currency support, and MCP integration for complete data privacy.
FinceptTerminal
Analytics · Invoicing Finance
Open-source Bloomberg alternative with AI agents and real-time market data
Frappe Books
Invoicing Finance
Offline desktop accounting with double-entry, POS, and custom invoice templates
OpenMeter
Developer Tools · Invoicing Finance
Open-source metering and billing engine for AI, agentic, and DevTool monetization — ingest usage events in real time and turn them into accurate invoices automatically.
Wallos
Invoicing Finance
Self-hosted personal subscription tracker with multi-currency support, household member management, and AI-powered savings recommendations.
About Invoicing & Finance
Managing finances effectively is crucial for any individual or organization. Open source Invoicing & Finance software provides a range of tools to streamline these processes, offering control and transparency over monetary operations. These solutions often include features like invoice creation, expense tracking, payment processing, and financial reporting.
The functionality within this category is diverse. Common capabilities include:
- Invoice Generation: Creating professional invoices with customizable templates and branding.
- Expense Management: Tracking business expenses, categorizing costs, and generating expense reports.
- Payment Processing: Integrating with payment gateways to accept online payments securely.
- Financial Reporting: Generating key financial statements like profit and loss statements, balance sheets, and cash flow reports.
- Budgeting: Tools for creating and managing budgets to control spending.
- Tax Calculation & Reporting: Automating tax calculations and preparing reports for filing purposes.
The value proposition of open source Invoicing & Finance software is significant. Users gain greater control over their data, reduce reliance on proprietary systems, and avoid vendor lock-in. These applications are often customizable to fit specific business needs and can integrate with other open source tools for a comprehensive solution. They empower teams to automate repetitive tasks, improve accuracy in financial records, and ultimately make better informed business decisions. Businesses can also reduce operational costs by leveraging self-hosted solutions and community support.
