SolidInvoice
Open-source invoicing and quoting app for small businesses
940 stars 227 forks last commit first released MIT
Actively maintained
Last commit 27 Jul 2026.
SolidInvoice is an open-source invoicing application built to help freelancers and small businesses manage billing operations. It centralizes clients, quotes, and invoices, and supports online payments and integrations via an API.
Key Features
- Client and contact management
- Create, send, and manage quotes and invoices
- Taxes and discounts handling
- Online payment acceptance (gateway support)
- RESTful API for integrations with other systems
- Notifications via multiple channels (for example email and SMS)
- Multi-currency support and team collaboration
Use Cases
- Freelancers issuing quotes and invoices and tracking payments
- Small businesses managing recurring billing and payment reminders
- Integrating invoicing data with external tools through the REST API
Limitations and Considerations
- Requires a modern PHP runtime (project targets PHP 8.4+)
SolidInvoice is a practical choice for organizations that want a clean, extensible billing workflow they can run on their own infrastructure. It fits teams that need quotes, invoicing, and payment collection in one place, with automation and API access for integration.
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