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Intervals.icu vs VeloViewer: catalog facts
Intervals.icu	VeloViewer
Free Free to use.	Freemium Free to start, with a paid PRO subscription for full features.
Web	Web
Detailed fitness, fatigue and power curve analytics Separate zones and metrics per sport	In-depth analysis of Strava activities Explorer tiles and route maps
Web only, requires an account Analytics depth can be a lot for casual users	Depends on a Strava account Full features need a PRO subscription
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.