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Intervals.icu vs HealthFit: catalog facts
Intervals.icu	HealthFit
Free Free to use.	Paid Costs $6.99 on the App Store, with in-app purchases.
Web	iOS
Detailed fitness, fatigue and power curve analytics Separate zones and metrics per sport	Training load, fitness, fatigue and form metrics from Apple Health data Heart rate zones, year comparisons and training heat maps
Web only, requires an account Analytics depth can be a lot for casual users	Apple devices only; depends on Apple Health Paid upfront with additional in-app purchases
Web application	Downloadable app
Closed source	Closed source
License not stated	License not stated
Account needed	No 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.