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TimeTracker vs Titra: catalog facts
TimeTracker	Titra
Free Free under GPL-3.0; an optional purchased key hides donation prompts.	Freemium Free to self-host and free hosted version, with paid private hosted instances.
Web, Self-hosted	Web, Self-hosted
Time tracking and invoicing in one tool Peppol and ZUGFeRD e-invoicing support	Very quick time entry Free hosted version and Docker Compose self-hosting
Large feature set can feel heavy for simple use Shows donation prompts unless a key is bought	Deliberately limited to time tracking Website is mainly in German
Self-hosted	Self-hosted, Hosted service
Open source	Open source
License: GPL-3.0	License: AGPL-3.0
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.