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Invoice Ninja vs TimeTracker: catalog facts
Invoice Ninja	TimeTracker
Freemium Free plan available, with paid plans that carry a 30-day money-back guarantee.	Free Free under GPL-3.0; an optional purchased key hides donation prompts.
Linux, Web	Web, Self-hosted
Supports many payment gateways for one-click client payments Recurring invoices and auto-billing	Time tracking and invoicing in one tool Peppol and ZUGFeRD e-invoicing support
Hosted service requires an account Some features are reserved for paid plans	Large feature set can feel heavy for simple use Shows donation prompts unless a key is bought
Downloadable app, Hosted service	Self-hosted
Open source	Open source
License: AAL	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 1, 2026	Official website Full listing and sources Checked October 2, 2026

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