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