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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
StripePayPalMollieCoinbase
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.