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