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G8 Invoicing vs SolidInvoice: catalog facts
G8 Invoicing	SolidInvoice
Free Free and open source under the GPL-3.0 licence.	Freemium Free to self-host; the hosted service is a monthly subscription with a 14-day trial.
Android	Web, Self-hosted
Converts quotes and delivery notes into invoices Exports PDF, Factur-X and CII-XML	Quotes, recurring invoices and automatic reminders Online payments via Stripe and PayPal
Small project with a limited user base Android is the only documented platform	Self-hosting requires a PHP server setup Focused on invoicing rather than full accounting
Downloadable app	Self-hosted, Hosted service
Open source	Open source
License: GPL-3.0	License: MIT
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 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.