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Billings Pro vs Invoice Ninja: catalog facts
Billings Pro	Invoice Ninja
Paid Includes a 30-day free trial.	Freemium Free plan available, with paid plans that carry a 30-day money-back guarantee.
macOS, iOS	Linux, Web
Combines time tracking, estimates, invoicing, and payment records Syncs across Mac, iPhone, iPad, and Apple Watch	Supports many payment gateways for one-click client payments Recurring invoices and auto-billing
Focused on freelancers and small business billing workflows	Hosted service requires an account Some features are reserved for paid plans
Downloadable app	Downloadable app, Hosted service
Closed source	Open source
License not stated	License: AAL
Not stated if an account is needed	Account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 1, 2026

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