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G8 Invoicing vs InvoicePlane: catalog facts
G8 Invoicing	InvoicePlane
Free Free and open source under the GPL-3.0 licence.	Free Free and open source, with no paid tier.
Android	Web, Self-hosted
Converts quotes and delivery notes into invoices Exports PDF, Factur-X and CII-XML	Covers quotes, invoices, payments and client records in one place EU-compliant eInvoice support
Small project with a limited user base Android is the only documented platform	Requires running and securing your own server Project and task management is basic
Downloadable app	Self-hosted
Open source	Open source
License: GPL-3.0	License: MIT
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 2, 2026

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