Simple Invoices

    Since 2005: 20+ Years of Invoicing

    Simple Invoices has been helping businesses get paid since 2005. That's over two decades of continuous development, community feedback, and real-world invoicing.

    Timeline

    YearMilestone
    2005First release. Built as a simple PHP invoicing tool
    2007Multi-language support, PDF generation
    2009Multi-currency, custom fields, payment tracking
    2011Version 2011.1: stable release, wide adoption
    2013Version 2013.1 beta: modernized codebase
    2020Zend Framework 1 Future fork for PHP 7+ compatibility
    2023Tabler UI rewrite, modern responsive design
    2024PHP 8.1+ full compatibility, PHPMailer 6 upgrade
    2025Laravel Blade templates, multi-domain SaaS architecture
    2026Docker support, Rspress documentation, 41+ languages

    Stability

    • Battle-tested by thousands of users over 20 years
    • Proven data integrity: no corruptions, no lost invoices
    • Backward compatibility: archives from 2005 still readable
    • Active maintenance with regular updates

    Why Longevity Matters

    Choosing invoicing software is a long-term decision:

    • Data ownership: Your 2005 invoices are still in your database today
    • No rug pulls: Open-source means the project can't disappear overnight
    • Institutional knowledge: The codebase has been refined through real-world feedback
    • Community trust: Thousands of users depend on it daily

    Simple Invoices is one of the longest-running open-source invoicing projects on the web.