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Intervals.icu vs Smashrun: catalog facts
Intervals.icu	Smashrun
Free Free to use.	Freemium Free to use, with a paid tier for extra features.
Web	Web
Detailed fitness, fatigue and power curve analytics Separate zones and metrics per sport	Detailed visual statistics for runs Stores and graphs years of history
Web only, requires an account Analytics depth can be a lot for casual users	Analysis only, relies on other apps or watches for recording Some features require payment
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 23, 2026

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