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

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