Compare software

Rechnungs-Assistent vs Invoice Ninja: catalog facts
Rechnungs-Assistent	Invoice Ninja
Free Free and open source under the GPL-3.0-or-later license.	Freemium Free plan available, with paid plans that carry a 30-day money-back guarantee.
Linux	Linux, Web
Stores customer and item details for reuse Imports and exports data as CSV	Supports many payment gateways for one-click client payments Recurring invoices and auto-billing
Designed for German invoicing Available for Linux	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-or-later	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 8, 2026	Official website Full listing and sources Checked October 1, 2026

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