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G8 Invoicing vs Zoho Invoice: catalog facts
G8 Invoicing	Zoho Invoice
Free Free and open source under the GPL-3.0 licence.	Free Free to use; payment gateway fees may apply.
Android	Windows, macOS, Android, iOS, Web
Converts quotes and delivery notes into invoices Exports PDF, Factur-X and CII-XML	Free invoicing with online payments and reminders Apps for mobile and desktop as well as the web
Small project with a limited user base Android is the only documented platform	Invoicing only; full bookkeeping needs a separate accounting product Requires a Zoho account
Downloadable app	Downloadable app, Web application, Hosted service
Open source	Closed source
License: GPL-3.0	License not stated
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.