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Xert vs Intervals.icu: catalog facts
Xert	Intervals.icu
Paid Paid service with a free 30-day trial.	Free Free to use.
Web	Web
Estimates fitness without dedicated FTP tests Real-time feedback during training	Detailed fitness, fatigue and power curve analytics Separate zones and metrics per sport
Requires an account and a paid plan after the trial Proprietary hosted service	Web only, requires an account Analytics depth can be a lot for casual users
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 24, 2026	Official website Full listing and sources Checked September 23, 2026

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