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Intervals.icu vs Workout Tracker: catalog facts
Intervals.icu	Workout Tracker
Free Free to use.	Free Free to run on your own server.
Web	Web, Self-hosted
Detailed fitness, fatigue and power curve analytics Separate zones and metrics per sport	Keeps GPS workout data on your own server Built around GPX files from running and similar activities
Web only, requires an account Analytics depth can be a lot for casual users	Requires running and maintaining your own server Geared towards GPX-based activities rather than gym workouts
Web application	Self-hosted
Closed source	Closed source
License not stated	License not stated
Account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

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