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TimeTracker vs solidtime: catalog facts
TimeTracker	solidtime
Free Free under GPL-3.0; an optional purchased key hides donation prompts.	Free Free and open source to self-host; a hosted cloud version is also offered.
Web, Self-hosted	Web, Self-hosted, Browser extension
Time tracking and invoicing in one tool Peppol and ZUGFeRD e-invoicing support	Clean, modern interface Flexible billable rates
Large feature set can feel heavy for simple use Shows donation prompts unless a key is bought	No invoicing described in its feature list Self-hosting requires following separate guides
Self-hosted	Downloadable app, Self-hosted, Hosted service, Browser extension
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.