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G8 Invoicing vs Billance: catalog facts
G8 Invoicing	Billance
Free Free and open source under the GPL-3.0 licence.	Freemium Free to start; details of paid plans are not given in the research.
Android	Linux
Converts quotes and delivery notes into invoices Exports PDF, Factur-X and CII-XML	Creates XRechnung and ZUGFeRD to EN 16931 Converts existing PDF invoices into e-invoices
Small project with a limited user base Android is the only documented platform	Interface and website are in German Proprietary software
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License: Proprietary
Not stated if an account is 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 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.