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Billy vs InvoicePlane: catalog facts
Billy	InvoicePlane
Paid Sold through the Mac App Store and the developer's site; the homepage does not state a…	Free Free and open source, with no paid tier.
macOS	Web, Self-hosted
EN 16931 and XRechnung compliant e-invoices Data saved in open JSON files	Covers quotes, invoices, payments and client records in one place EU-compliant eInvoice support
macOS only Focused on invoicing rather than full accounting	Requires running and securing your own server Project and task management is basic
Downloadable app	Self-hosted
Closed source	Open source
License not stated	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.