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

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