Compare software

Invoice Ninja vs Rechnungs-Assistent: catalog facts
Invoice Ninja	Rechnungs-Assistent
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-or-later license.
Linux, Web	Linux
Supports many payment gateways for one-click client payments Recurring invoices and auto-billing	Stores customer and item details for reuse Imports and exports data as CSV
Hosted service requires an account Some features are reserved for paid plans	Designed for German invoicing Available for Linux
Downloadable app, Hosted service	Downloadable app
Open source	Open source
License: AAL	License: GPL-3.0-or-later
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 8, 2026

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