Simple Invoices

    Free & Open Source

    Simple Invoices is free software released under the GNU General Public License v3 (GPLv3). No license fees, no per-user charges, no hidden costs.

    What This Means

    FreedomDescription
    UseRun it for any purpose: personal, business, SaaS
    StudyFull source code available. Learn how it works
    ModifyCustomise it to your needs. Add features, change behaviour
    ShareDistribute your modifications under the same license

    No Vendor Lock-In

    • Your data is in your database on your server
    • Standard SQL schema: exportable, queryable, migratable
    • Open formats throughout (JSON, CSV, PDF, DOCX, XLSX)
    • No proprietary APIs or services required

    Community

    Simple Invoices has been community-driven since 2005:

    Stack

    Built on proven, open-source technologies:

    LayerTechnology
    LanguagePHP 8.1+
    FrameworkZend Framework 1 (ZF1-Future fork)
    TemplatesLaravel Blade (Jenssegers)
    EmailPHPMailer 6
    FrontendTabler CSS, jQuery, Tom Select
    PDFHTML2PDF
    ChartsApexCharts