Open Source Invoicing & Payments Software
Invoicing & Payments software automates the creation of bills, estimates, and payment requests for clients. These tools track billable hours, manage subscription cycles, and record business expenses to maintain accurate financial records. Freelancers and small business owners use this type of software to organize cash flow and bank transactions. Self-hosting these apps ensures that sensitive financial documents and client payment histories remain on private hardware. This approach removes reliance on external billing platforms and avoids monthly charges for managing company revenue.
This page lists 17 open source tools in the Invoicing & Payments category. The most popular are Midday, Lago and Akaunting. Most use the AGPL-3.0 or MIT license, and 13 offer an official Docker image.
Midday
A business management tool for freelancers to track time, organize financial documents, and manage bank transactions.
Lago
Manage usage based and subscription billing with an open source system for metering, invoicing, and revenue analytics.
Akaunting
Self-hostable accounting software for small businesses and freelancers to manage invoicing, expense tracking, and cash flow.
Invoice Ninja
Create and send professional invoices, track expenses, accept payments, and manage projects from a self-hosted web app.
Crater
A self-hosted billing and accounting tool for tracking expenses, managing payments, and creating professional invoices and estimates.
BTCPay Server
A self-hosted Bitcoin payment processor for accepting peer-to-peer payments without transaction fees or intermediaries.
Frappe Books
Manage business finances with double-entry accounting, invoicing, and expense tracking in a local desktop application.
Frappe Books
Manage business finances with double-entry accounting, invoicing, and point of sale tools in an offline desktop app.
Kimai
Track billable hours and manage project budgets with a self-hosted system for freelancers and companies.
Flexprice
Manage usage-based metering, credit systems, and subscription billing with an open architecture for AI and SaaS teams.
InvoicePlane
A self-hosted application for managing professional invoices, client records, and payment tracking for business owners.
InvoiceShelf
A self-hosted invoicing and expense tracking system for individuals and small businesses to manage their books.
FOSSBilling
Automate invoicing, payments, and client communication for online service businesses, subscription services, and hosting providers.
Meteroid
Manage usage-based pricing and subscription billing for SaaS companies through a self-hosted, API-driven monetization platform.
ITFlow
A unified documentation, ticket management, and accounting platform designed specifically for managed service providers.
SolidInvoice
Manage quotes, invoices, and recurring billing for freelancers and small businesses with full data ownership.
LedgerSMB
A web-based double-entry accounting system and ERP for small and medium sized business operations.
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