Open-source invoicing you can self-host for free
Invoice Ninja is an open-source invoicing and billing platform. Self-host it for free on your own server (full features, no limits) or use their hosted cloud plan. Features include recurring invoices, client portal, expense tracking, time tracking, and payment gateway integrations. The open-source version is genuinely full-featured.
Use when
You're technically capable and want a fully featured invoicing platform with zero monthly cost by running it on your own server.
Skip when
You don't want to manage your own server - Wave or FreshBooks are simpler cloud alternatives.
The self-hosted version is completely free and has no contact or invoice limits. Good option for technically capable founders who want professional invoicing without any subscription cost.
Alternatives
