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Trackbook vs μlogger: catalog facts
Trackbook	μlogger
Free Free and open source under the MIT licence.	Free Free and open source under GPL-3.0-or-later.
Android	Android
Simple start-and-record workflow Uses OpenStreetMap map data	Background tracking at chosen intervals or on demand Offline tracking and GPX export
Bare-bones by design, without training plans or detailed fitness analysis Android only	Server synchronization requires a separate μlogger web server
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0-or-later
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 8, 2026

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