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Open-source invoicing platform with a powerful free tier and self-hosting option
Invoice Ninja is an open-source invoicing and billing platform that offers one of the most generous free tiers in the market alongside a self-hosting option that gives technically capable users complete control over their data. The free plan supports up to 20 clients with unlimited invoices, quotes, payments, and expense tracking — a full-featured experience most competitors reserve for paid tiers. The Pro upgrade removes client limits and adds advanced features including custom invoice designs, recurring invoices, auto-billing, and white-labeling. The Enterprise plan supports multiple companies under one account and adds advanced user permissions. For developers and privacy-conscious businesses, Invoice Ninja's self-hosted version can be deployed on any server at zero cost, with full feature parity to the cloud product. The platform supports over 40 payment gateways including Stripe, PayPal, Square, Authorize.Net, and cryptocurrency processors. Client portal enables customers to view invoices, make payments, and download statements. Time tracking, expense management, and basic project tracking are included. The API is comprehensive for custom integrations. Available in over 30 languages with multi-currency support. Invoice Ninja is ideal for technically proficient freelancers and small businesses who value data ownership, flexibility, or cost efficiency.