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Simple Invoices

Free, open-source invoicing since 2005·simpleinvoices.org

Simple Invoices is a free, open-source web application for creating and managing invoices, clients, and payments, installed and run on your own server. It supports multi-currency and multi-language invoicing, recurring billing, PDF generation, and online payment gateways. It can run as a multi-domain setup for SaaS platforms or multi-brand organizations, and works with MySQL, MariaDB, PostgreSQL, or SQLite databases.

What it's for

Create and manage invoices, clients, and paymentsRun isolated invoice domains for SaaS platforms, multi-brand organizations, and regional officesGenerate professional PDF invoices with a company logoAutomate recurring/repeat billing on daily, weekly, monthly, or yearly schedulesAccept online payments via integrated payment gatewaysEmail invoices with automatic PDF attachmentsIssue invoices in a customer's native language via per-invoice language settingsIssue invoices in different currencies per invoice

Features 14

30-second Docker-based setup
Automatic emailing of invoices with PDF attachments
Client and payment management
Multi-currency support (40+ preset currencies plus custom currencies, locale-aware formatting)
Multi-database support: MySQL, MariaDB, PostgreSQL, or SQLite
Multi-domain SaaS: unlimited isolated invoice domains from one installation
Multi-language invoicing (41+ languages with per-invoice language settings)
Online payment acceptance via Stripe, PayPal, Mollie, Coinbase, and more (nine integrated gateways, per-invoice configuration)
Open data formats throughout (JSON, CSV, PDF, DOCX, XLSX)
Professional PDF invoice generation with logo and multiple templates
Recurring invoices with daily, weekly, monthly, or yearly recurrence
Standard SQL schema that is exportable, queryable, and migratable
Web-based, responsive design for desktop, tablet, and phone
Zero-setup SQLite database (single-file database)

At a glance

free tieropen sourceself-hostable

TypeWeb app

DeploymentSelf-hosted

PlatformsWeb

Integrations

MollieCoinbasePayPalStripe

Pricing

Free and open-source under GPLv3; no license fees or per-user charges; no paid plans are offered.

Free / Open SourceFree

Free and open source software (GPLv3); self-hosted on your own server/database.