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Billy vs Billance: catalog facts
Billy	Billance
Paid Sold through the Mac App Store and the developer's site; the homepage does not state a…	Freemium Free to start; details of paid plans are not given in the research.
macOS	Linux
EN 16931 and XRechnung compliant e-invoices Data saved in open JSON files	Creates XRechnung and ZUGFeRD to EN 16931 Converts existing PDF invoices into e-invoices
macOS only Focused on invoicing rather than full accounting	Interface and website are in German Proprietary software
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License: Proprietary
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 1, 2026

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