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Intervals.icu vs Xert: catalog facts
Intervals.icu	Xert
Free Free to use.	Paid Paid service with a free 30-day trial.
Web	Web
Detailed fitness, fatigue and power curve analytics Separate zones and metrics per sport	Estimates fitness without dedicated FTP tests Real-time feedback during training
Web only, requires an account Analytics depth can be a lot for casual users	Requires an account and a paid plan after the trial Proprietary hosted service
Web application	Web application
Closed source	Closed source
License not stated	License not stated
Account needed	Account needed
Needs internet	Needs internet
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.