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Invoice Ninja vs G8 Invoicing: catalog facts
Invoice Ninja	G8 Invoicing
Freemium Free plan available, with paid plans that carry a 30-day money-back guarantee.	Free Free and open source under the GPL-3.0 licence.
Linux, Web	Android
Supports many payment gateways for one-click client payments Recurring invoices and auto-billing	Converts quotes and delivery notes into invoices Exports PDF, Factur-X and CII-XML
Hosted service requires an account Some features are reserved for paid plans	Small project with a limited user base Android is the only documented platform
Downloadable app, Hosted service	Downloadable app
Open source	Open source
License: AAL	License: GPL-3.0
Account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.