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G8 Invoicing vs Rechnungs-Assistent: catalog facts
G8 Invoicing	Rechnungs-Assistent
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the GPL-3.0-or-later license.
Android	Linux
Converts quotes and delivery notes into invoices Exports PDF, Factur-X and CII-XML	Stores customer and item details for reuse Imports and exports data as CSV
Small project with a limited user base Android is the only documented platform	Designed for German invoicing Available for Linux
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0-or-later
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 8, 2026

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