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Intervals.icu vs Final Surge: catalog facts
Intervals.icu	Final Surge
Free Free to use.	Freemium Free training log with a paid Athlete Premium tier and paid coaching options.
Web	Android, iOS, Web
Detailed fitness, fatigue and power curve analytics Separate zones and metrics per sport	Free training log for many endurance sports Syncs with Garmin Connect, Strava and TrainerRoad
Web only, requires an account Analytics depth can be a lot for casual users	Premium features require a paid tier Closed source service
Web application	Downloadable app, Web application
Closed source	Closed source
License not stated	License not stated
Account needed	Account 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 23, 2026

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