Review of Invoice Ninja powered by the Slant community.
Invoice Ninja is an open-source solution for invoicing and billing that can be used from any device that has access to the web.
SpecsUpdate
PlatformsWeb, Windows, Linux, Mac, Mobile
TechnologyPHP, JavaScript
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Pros
Pro Free version
Free for up to 20 clients.
Cons
Con Branding
Free version shows "Created by InvoiceNinja" message in the invoice.