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Trayzero vs Nirvana: catalog facts
Trayzero	Nirvana
Free Free and open source under the GPL 3.0.	Freemium Free to start, with paid features offered on top.
Android	Web
Designed around the GTD workflow Capture button on every screen and capture from the share menu	Built directly around the GTD inbox, next actions and projects workflow Context tags for filtering tasks by place or situation
Android only No mention of sync between devices	Less useful if you do not follow GTD Hosted service, so tasks are stored on the developer's servers
Downloadable app	Web application, Hosted service
Open source	Closed source
License: GPL-3.0-only	License not stated
No account needed	Account needed
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.