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Fitness Calendar vs OpenTracks: catalog facts
Fitness Calendar	OpenTracks
Free Free and open source under GPL-2.0-only.	Free Free and open source.
Android	Android
Tracks activities and records sessions Imports GPX files and supports custom activity types	Records GPS tracks for runs, rides and hikes Supports Bluetooth Low Energy heart rate sensors
Internet access is needed if you enable MapLibre maps	Android only No hosted sync or social features
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0-only	License not stated
Not stated if an account is needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked September 23, 2026

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