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SkillApp vs Study Tracker: catalog facts
SkillApp	Study Tracker
Free Free and open source with no ads.	Free Free and open source under Apache-2.0.
Android	Android
Fully offline with no internet access No ads or data collection	Organizes study work into hierarchical projects and units Records session time and calculates progress
Android only Few features beyond timing skills	Currently available only in Chinese Android only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: Apache-2.0
No account needed	Not stated if an account is needed
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.